diff options
Diffstat (limited to '')
| -rw-r--r-- | sql/field.h | 5859 |
1 files changed, 5859 insertions, 0 deletions
diff --git a/sql/field.h b/sql/field.h new file mode 100644 index 00000000..9fe4db3b --- /dev/null +++ b/sql/field.h @@ -0,0 +1,5859 @@ +#ifndef FIELD_INCLUDED +#define FIELD_INCLUDED +/* Copyright (c) 2000, 2015, Oracle and/or its affiliates. + Copyright (c) 2008, 2021, MariaDB Corporation. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ + +/* + Because of the function make_new_field() all field classes that have static + variables must declare the size_of() member function. +*/ + +#ifdef USE_PRAGMA_INTERFACE +#pragma interface /* gcc class implementation */ +#endif + +#include "mysqld.h" /* system_charset_info */ +#include "table.h" /* TABLE */ +#include "sql_string.h" /* String */ +#include "my_decimal.h" /* my_decimal */ +#include "sql_error.h" /* Sql_condition */ +#include "compat56.h" +#include "sql_type.h" /* Type_std_attributes */ +#include "field_comp.h" + +class Send_field; +class Copy_field; +class Protocol; +class Protocol_text; +class Create_field; +class Relay_log_info; +class Field; +class Column_statistics; +class Column_statistics_collected; +class Item_func; +class Item_bool_func; +class Item_equal; +class Virtual_tmp_table; +class Qualified_column_ident; +class Table_ident; +class SEL_ARG; +class RANGE_OPT_PARAM; +struct KEY_PART; +struct SORT_FIELD; +struct SORT_FIELD_ATTR; + +enum enum_check_fields +{ + CHECK_FIELD_IGNORE, + CHECK_FIELD_EXPRESSION, + CHECK_FIELD_WARN, + CHECK_FIELD_ERROR_FOR_NULL, +}; + + +enum enum_conv_type +{ + CONV_TYPE_PRECISE, + CONV_TYPE_VARIANT, + CONV_TYPE_SUBSET_TO_SUPERSET, + CONV_TYPE_SUPERSET_TO_SUBSET, + CONV_TYPE_IMPOSSIBLE +}; + + +class Conv_param +{ + uint16 m_table_def_flags; +public: + Conv_param(uint16 table_def_flags) + :m_table_def_flags(table_def_flags) + { } + uint16 table_def_flags() const { return m_table_def_flags; } +}; + + +class Conv_source: public Type_handler_hybrid_field_type +{ + uint16 m_metadata; + CHARSET_INFO *m_cs; +public: + Conv_source(const Type_handler *h, uint16 metadata, CHARSET_INFO *cs) + :Type_handler_hybrid_field_type(h), + m_metadata(metadata), + m_cs(cs) + { + DBUG_ASSERT(cs); + } + uint16 metadata() const { return m_metadata; } + uint mbmaxlen() const { return m_cs->mbmaxlen; } +}; + + +/* + Common declarations for Field and Item +*/ +class Value_source +{ +protected: + + // Parameters for warning and note generation + class Warn_filter + { + bool m_want_warning_edom; + bool m_want_note_truncated_spaces; + public: + Warn_filter(bool want_warning_edom, bool want_note_truncated_spaces) : + m_want_warning_edom(want_warning_edom), + m_want_note_truncated_spaces(want_note_truncated_spaces) + { } + Warn_filter(const THD *thd); + bool want_warning_edom() const + { return m_want_warning_edom; } + bool want_note_truncated_spaces() const + { return m_want_note_truncated_spaces; } + }; + class Warn_filter_all: public Warn_filter + { + public: + Warn_filter_all() :Warn_filter(true, true) { } + }; + + class Converter_double_to_longlong + { + protected: + bool m_error; + longlong m_result; + public: + Converter_double_to_longlong(double nr, bool unsigned_flag); + longlong result() const { return m_result; } + bool error() const { return m_error; } + void push_warning(THD *thd, double nr, bool unsigned_flag); + }; + class Converter_double_to_longlong_with_warn: + public Converter_double_to_longlong + { + public: + Converter_double_to_longlong_with_warn(THD *thd, double nr, + bool unsigned_flag) + :Converter_double_to_longlong(nr, unsigned_flag) + { + if (m_error) + push_warning(thd, nr, unsigned_flag); + } + Converter_double_to_longlong_with_warn(double nr, bool unsigned_flag) + :Converter_double_to_longlong(nr, unsigned_flag) + { + if (m_error) + push_warning(current_thd, nr, unsigned_flag); + } + }; + + // String-to-number converters + class Converter_string_to_number + { + protected: + char *m_end_of_num; // Where the low-level conversion routine stopped + int m_error; // The error code returned by the low-level routine + bool m_edom; // If EDOM-alike error happened during conversion + /** + Check string-to-number conversion and produce a warning if + - could not convert any digits (EDOM-alike error) + - found garbage at the end of the string + - found extra spaces at the end (a note) + See also Field_num::check_edom_and_truncation() for a similar function. + + @param thd - the thread that will be used to generate warnings. + Can be NULL (which means current_thd will be used + if a warning is really necessary). + @param type - name of the data type + (e.g. "INTEGER", "DECIMAL", "DOUBLE") + @param cs - character set of the original string + @param str - the original string + @param end - the end of the string + @param allow_notes - tells if trailing space notes should be displayed + or suppressed. + + Unlike Field_num::check_edom_and_truncation(), this function does not + distinguish between EDOM and truncation and reports the same warning for + both cases. Perhaps we should eventually print different warnings, + to make the explicit CAST work closer to the implicit cast in + Field_xxx::store(). + */ + void check_edom_and_truncation(THD *thd, Warn_filter filter, + const char *type, + CHARSET_INFO *cs, + const char *str, + size_t length) const; + public: + int error() const { return m_error; } + }; + + class Converter_strntod: public Converter_string_to_number + { + double m_result; + public: + Converter_strntod(CHARSET_INFO *cs, const char *str, size_t length) + { + m_result= cs->strntod((char *) str, length, &m_end_of_num, &m_error); + // strntod() does not set an error if the input string was empty + m_edom= m_error !=0 || str == m_end_of_num; + } + double result() const { return m_result; } + }; + + class Converter_string_to_longlong: public Converter_string_to_number + { + protected: + longlong m_result; + public: + longlong result() const { return m_result; } + }; + + class Converter_strntoll: public Converter_string_to_longlong + { + public: + Converter_strntoll(CHARSET_INFO *cs, const char *str, size_t length) + { + m_result= cs->strntoll(str, length, 10, &m_end_of_num, &m_error); + /* + All non-zero errors means EDOM error. + strntoll() does not set an error if the input string was empty. + Check it here. + Notice the different with the same condition in Converter_strntoll10. + */ + m_edom= m_error != 0 || str == m_end_of_num; + } + }; + + class Converter_strtoll10: public Converter_string_to_longlong + { + public: + Converter_strtoll10(CHARSET_INFO *cs, const char *str, size_t length) + { + m_end_of_num= (char *) str + length; + m_result= cs->strtoll10(str, &m_end_of_num, &m_error); + /* + Negative error means "good negative number". + Only a positive m_error value means a real error. + strtoll10() sets error to MY_ERRNO_EDOM in case of an empty string, + so we don't have to additionally catch empty strings here. + */ + m_edom= m_error > 0; + } + }; + + class Converter_str2my_decimal: public Converter_string_to_number + { + public: + Converter_str2my_decimal(uint mask, + CHARSET_INFO *cs, const char *str, size_t length, + my_decimal *buf) + { + DBUG_ASSERT(length < UINT_MAX32); + m_error= str2my_decimal(mask, str, length, cs, + buf, (const char **) &m_end_of_num); + // E_DEC_TRUNCATED means a very minor truncation: '1e-100' -> 0 + m_edom= m_error && m_error != E_DEC_TRUNCATED; + } + }; + + + // String-to-number converters with automatic warning generation + class Converter_strntod_with_warn: public Converter_strntod + { + public: + Converter_strntod_with_warn(THD *thd, Warn_filter filter, + CHARSET_INFO *cs, + const char *str, size_t length) + :Converter_strntod(cs, str, length) + { + check_edom_and_truncation(thd, filter, "DOUBLE", cs, str, length); + } + }; + + class Converter_strntoll_with_warn: public Converter_strntoll + { + public: + Converter_strntoll_with_warn(THD *thd, Warn_filter filter, + CHARSET_INFO *cs, + const char *str, size_t length) + :Converter_strntoll(cs, str, length) + { + check_edom_and_truncation(thd, filter, "INTEGER", cs, str, length); + } + }; + + class Converter_strtoll10_with_warn: public Converter_strtoll10 + { + public: + Converter_strtoll10_with_warn(THD *thd, Warn_filter filter, + CHARSET_INFO *cs, + const char *str, size_t length) + :Converter_strtoll10(cs, str, length) + { + check_edom_and_truncation(thd, filter, "INTEGER", cs, str, length); + } + }; + + class Converter_str2my_decimal_with_warn: public Converter_str2my_decimal + { + public: + Converter_str2my_decimal_with_warn(THD *thd, Warn_filter filter, + uint mask, CHARSET_INFO *cs, + const char *str, size_t length, + my_decimal *buf) + :Converter_str2my_decimal(mask, cs, str, length, buf) + { + check_edom_and_truncation(thd, filter, "DECIMAL", cs, str, length); + } + }; + + + // String-to-number conversion methods for the old code compatibility + longlong longlong_from_string_with_check(CHARSET_INFO *cs, const char *cptr, + const char *end) const + { + /* + TODO: Give error if we wanted a signed integer and we got an unsigned + one + + Notice, longlong_from_string_with_check() honors thd->no_error, because + it's used to handle queries like this: + SELECT COUNT(@@basedir); + and is called when Item_func_get_system_var::update_null_value() + suppresses warnings and then calls val_int(). + The other methods {double|decimal}_from_string_with_check() ignore + thd->no_errors, because they are not used for update_null_value() + and they always allow all kind of warnings. + */ + THD *thd= current_thd; + return Converter_strtoll10_with_warn(thd, Warn_filter(thd), + cs, cptr, end - cptr).result(); + } + + double double_from_string_with_check(CHARSET_INFO *cs, const char *cptr, + const char *end) const + { + return Converter_strntod_with_warn(NULL, Warn_filter_all(), + cs, cptr, end - cptr).result(); + } + my_decimal *decimal_from_string_with_check(my_decimal *decimal_value, + CHARSET_INFO *cs, + const char *cptr, + const char *end) + { + Converter_str2my_decimal_with_warn(NULL, Warn_filter_all(), + E_DEC_FATAL_ERROR & ~E_DEC_BAD_NUM, + cs, cptr, end - cptr, decimal_value); + return decimal_value; + } + + longlong longlong_from_hex_hybrid(const char *str, size_t length) + { + const char *end= str + length; + const char *ptr= end - MY_MIN(length, sizeof(longlong)); + ulonglong value= 0; + for ( ; ptr != end ; ptr++) + value= (value << 8) + (ulonglong) (uchar) *ptr; + return (longlong) value; + } + + longlong longlong_from_string_with_check(const String *str) const + { + return longlong_from_string_with_check(str->charset(), + str->ptr(), str->end()); + } + double double_from_string_with_check(const String *str) const + { + return double_from_string_with_check(str->charset(), + str->ptr(), str->end()); + } + my_decimal *decimal_from_string_with_check(my_decimal *decimal_value, + const String *str) + { + return decimal_from_string_with_check(decimal_value, str->charset(), + str->ptr(), str->end()); + } + // End of String-to-number conversion methods + +public: + /* + The enumeration Subst_constraint is currently used only in implementations + of the virtual function subst_argument_checker. + */ + enum Subst_constraint + { + ANY_SUBST, /* Any substitution for a field is allowed */ + IDENTITY_SUBST /* Substitution for a field is allowed if any two + different values of the field type are not equal */ + }; + /* + Item context attributes. + Comparison functions pass their attributes to propagate_equal_fields(). + For example, for string comparison, the collation of the comparison + operation is important inside propagate_equal_fields(). + */ + class Context + { + /* + Which type of propagation is allowed: + - ANY_SUBST (loose equality, according to the collation), or + - IDENTITY_SUBST (strict binary equality). + */ + Subst_constraint m_subst_constraint; + /* + Comparison type. + Important only when ANY_SUBSTS. + */ + const Type_handler *m_compare_handler; + /* + Collation of the comparison operation. + Important only when ANY_SUBST. + */ + CHARSET_INFO *m_compare_collation; + public: + Context(Subst_constraint subst, const Type_handler *h, CHARSET_INFO *cs) + :m_subst_constraint(subst), + m_compare_handler(h), + m_compare_collation(cs) + { DBUG_ASSERT(h == h->type_handler_for_comparison()); } + Subst_constraint subst_constraint() const { return m_subst_constraint; } + const Type_handler *compare_type_handler() const + { + DBUG_ASSERT(m_subst_constraint == ANY_SUBST); + return m_compare_handler; + } + CHARSET_INFO *compare_collation() const + { + DBUG_ASSERT(m_subst_constraint == ANY_SUBST); + return m_compare_collation; + } + }; + class Context_identity: public Context + { // Use this to request only exact value, no invariants. + public: + Context_identity() + :Context(IDENTITY_SUBST, &type_handler_long_blob, &my_charset_bin) { } + }; + class Context_boolean: public Context + { // Use this when an item is [a part of] a boolean expression + public: + Context_boolean() + :Context(ANY_SUBST, &type_handler_slonglong, &my_charset_bin) { } + }; +}; + + +#define STORAGE_TYPE_MASK 7 +#define COLUMN_FORMAT_MASK 7 +#define COLUMN_FORMAT_SHIFT 3 + +/* The length of the header part for each virtual column in the .frm file */ +#define FRM_VCOL_OLD_HEADER_SIZE(b) (3 + MY_TEST(b)) +#define FRM_VCOL_NEW_BASE_SIZE 16 +#define FRM_VCOL_NEW_HEADER_SIZE 6 + +class Count_distinct_field; + +struct ha_field_option_struct; + +struct st_cache_field; +int field_conv(Field *to,Field *from); +int truncate_double(double *nr, uint field_length, uint dec, + bool unsigned_flag, double max_value); + +inline uint get_enum_pack_length(int elements) +{ + return elements < 256 ? 1 : 2; +} + +inline uint get_set_pack_length(int elements) +{ + uint len= (elements + 7) / 8; + return len > 4 ? 8 : len; +} + + +/** + Tests if field type is temporal and has date part, + i.e. represents DATE, DATETIME or TIMESTAMP types in SQL. + + @param type Field type, as returned by field->type(). + @retval true If field type is temporal type with date part. + @retval false If field type is not temporal type with date part. +*/ +inline bool is_temporal_type_with_date(enum_field_types type) +{ + switch (type) + { + case MYSQL_TYPE_DATE: + case MYSQL_TYPE_DATETIME: + case MYSQL_TYPE_TIMESTAMP: + return true; + case MYSQL_TYPE_DATETIME2: + case MYSQL_TYPE_TIMESTAMP2: + DBUG_ASSERT(0); // field->real_type() should not get to here. + return false; + default: + return false; + } +} + + +enum enum_vcol_info_type +{ + VCOL_GENERATED_VIRTUAL, VCOL_GENERATED_STORED, + VCOL_DEFAULT, VCOL_CHECK_FIELD, VCOL_CHECK_TABLE, + /* Additional types should be added here */ + /* Following is the highest value last */ + VCOL_TYPE_NONE = 127 // Since the 0 value is already in use +}; + +static inline const char *vcol_type_name(enum_vcol_info_type type) +{ + switch (type) + { + case VCOL_GENERATED_VIRTUAL: + case VCOL_GENERATED_STORED: + return "GENERATED ALWAYS AS"; + case VCOL_DEFAULT: + return "DEFAULT"; + case VCOL_CHECK_FIELD: + case VCOL_CHECK_TABLE: + return "CHECK"; + case VCOL_TYPE_NONE: + return "UNTYPED"; + } + return 0; +} + +/* + Flags for Virtual_column_info. If none is set, the expression must be + a constant with no side-effects, so it's calculated at CREATE TABLE time, + stored in table->record[2], and not recalculated for every statement. +*/ +#define VCOL_FIELD_REF 1 +#define VCOL_NON_DETERMINISTIC 2 +#define VCOL_SESSION_FUNC 4 /* uses session data, e.g. USER or DAYNAME */ +#define VCOL_TIME_FUNC 8 +#define VCOL_AUTO_INC 16 +#define VCOL_IMPOSSIBLE 32 +#define VCOL_NOT_VIRTUAL 64 /* Function can't be virtual */ +#define VCOL_CHECK_CONSTRAINT_IF_NOT_EXISTS 128 + +#define VCOL_NOT_STRICTLY_DETERMINISTIC \ + (VCOL_NON_DETERMINISTIC | VCOL_TIME_FUNC | VCOL_SESSION_FUNC) + +/* + Virtual_column_info is the class to contain additional + characteristics that is specific for a virtual/computed + field such as: + - the defining expression that is evaluated to compute the value + of the field + - whether the field is to be stored in the database + - whether the field is used in a partitioning expression +*/ + +class Virtual_column_info: public Sql_alloc, + private Type_handler_hybrid_field_type +{ +private: + enum_vcol_info_type vcol_type; /* Virtual column expression type */ + /* + The following data is only updated by the parser and read + when a Create_field object is created/initialized. + */ + /* Flag indicating that the field used in a partitioning expression */ + bool in_partitioning_expr; + +public: + /* Flag indicating that the field is physically stored in the database */ + bool stored_in_db; + bool utf8; /* Already in utf8 */ + bool automatic_name; + Item *expr; + Lex_ident name; /* Name of constraint */ + /* see VCOL_* (VCOL_FIELD_REF, ...) */ + uint flags; + + Virtual_column_info() + :Type_handler_hybrid_field_type(&type_handler_null), + vcol_type((enum_vcol_info_type)VCOL_TYPE_NONE), + in_partitioning_expr(FALSE), stored_in_db(FALSE), + utf8(TRUE), automatic_name(FALSE), expr(NULL), flags(0) + { + name.str= NULL; + name.length= 0; + }; + Virtual_column_info* clone(THD *thd); + ~Virtual_column_info() {}; + enum_vcol_info_type get_vcol_type() const + { + return vcol_type; + } + void set_vcol_type(enum_vcol_info_type v_type) + { + vcol_type= v_type; + } + const char *get_vcol_type_name() const + { + DBUG_ASSERT(vcol_type != VCOL_TYPE_NONE); + return vcol_type_name(vcol_type); + } + void set_handler(const Type_handler *handler) + { + /* Calling this function can only be done once. */ + DBUG_ASSERT(type_handler() == &type_handler_null); + Type_handler_hybrid_field_type::set_handler(handler); + } + bool is_stored() const + { + return stored_in_db; + } + void set_stored_in_db_flag(bool stored) + { + stored_in_db= stored; + } + bool is_in_partitioning_expr() const + { + return in_partitioning_expr; + } + void mark_as_in_partitioning_expr() + { + in_partitioning_expr= TRUE; + } + inline bool is_equal(const Virtual_column_info* vcol) const; + inline void print(String*); +}; + +class Binlog_type_info +{ +public: + enum binlog_sign_t + { + SIGN_SIGNED, + SIGN_UNSIGNED, + SIGN_NOT_APPLICABLE // for non-numeric types + }; + uchar m_type_code; // according to Field::binlog_type() + /** + Retrieve the field metadata for fields. + */ + uint16 m_metadata; + uint8 m_metadata_size; + binlog_sign_t m_signedness; + CHARSET_INFO *m_cs; // NULL if not relevant + TYPELIB *m_enum_typelib; // NULL if not relevant + TYPELIB *m_set_typelib; // NULL if not relevant + uchar m_geom_type; // Non-geometry fields can return 0 + Binlog_type_info(uchar type_code, + uint16 metadata, + uint8 metadata_size) + :m_type_code(type_code), + m_metadata(metadata), + m_metadata_size(metadata_size), + m_signedness(SIGN_NOT_APPLICABLE), + m_cs(NULL), + m_enum_typelib(NULL), + m_set_typelib(NULL), + m_geom_type(0) + {}; + Binlog_type_info(uchar type_code, uint16 metadata, + uint8 metadata_size, + binlog_sign_t signedness) + :m_type_code(type_code), + m_metadata(metadata), + m_metadata_size(metadata_size), + m_signedness(signedness), + m_cs(NULL), + m_enum_typelib(NULL), + m_set_typelib(NULL), + m_geom_type(0) + {}; + Binlog_type_info(uchar type_code, uint16 metadata, + uint8 metadata_size, + CHARSET_INFO *cs) + :m_type_code(type_code), + m_metadata(metadata), + m_metadata_size(metadata_size), + m_signedness(SIGN_NOT_APPLICABLE), + m_cs(cs), + m_enum_typelib(NULL), + m_set_typelib(NULL), + m_geom_type(0) + {}; + Binlog_type_info(uchar type_code, uint16 metadata, + uint8 metadata_size, + CHARSET_INFO *cs, + TYPELIB *t_enum, TYPELIB *t_set) + :m_type_code(type_code), + m_metadata(metadata), + m_metadata_size(metadata_size), + m_signedness(SIGN_NOT_APPLICABLE), + m_cs(cs), + m_enum_typelib(t_enum), + m_set_typelib(t_set), + m_geom_type(0) + {}; + Binlog_type_info(uchar type_code, uint16 metadata, + uint8 metadata_size, CHARSET_INFO *cs, + uchar geom_type) + :m_type_code(type_code), + m_metadata(metadata), + m_metadata_size(metadata_size), + m_signedness(SIGN_NOT_APPLICABLE), + m_cs(cs), + m_enum_typelib(NULL), + m_set_typelib(NULL), + m_geom_type(geom_type) + {}; + static void *operator new(size_t size, MEM_ROOT *mem_root) throw () + { return alloc_root(mem_root, size); } +}; + + +class Binlog_type_info_fixed_string: public Binlog_type_info +{ +public: + Binlog_type_info_fixed_string(uchar type_code, + uint32 octet_length, + CHARSET_INFO *cs); +}; + + +class Field: public Value_source +{ + Field(const Item &); /* Prevent use of these */ + void operator=(Field &); +protected: + int save_in_field_str(Field *to) + { + StringBuffer<MAX_FIELD_WIDTH> result(charset()); + val_str(&result); + return to->store(result.ptr(), result.length(), charset()); + } + void error_generated_column_function_is_not_allowed(THD *thd, bool error) + const; + static void do_field_eq(Copy_field *copy); + static void do_field_int(Copy_field *copy); + static void do_field_real(Copy_field *copy); + static void do_field_string(Copy_field *copy); + static void do_field_date(Copy_field *copy); + static void do_field_temporal(Copy_field *copy, date_mode_t fuzzydate); + static void do_field_datetime(Copy_field *copy); + static void do_field_timestamp(Copy_field *copy); + static void do_field_decimal(Copy_field *copy); +public: + static void *operator new(size_t size, MEM_ROOT *mem_root) throw () + { return alloc_root(mem_root, size); } + static void *operator new(size_t size) throw () + { + DBUG_ASSERT(size < UINT_MAX32); + return thd_alloc(current_thd, (uint) size); + } + static void operator delete(void *ptr_arg, size_t size) { TRASH_FREE(ptr_arg, size); } + static void operator delete(void *ptr, MEM_ROOT *mem_root) + { DBUG_ASSERT(0); } + + bool marked_for_read() const; + bool marked_for_write_or_computed() const; + + /** + Used by System Versioning. + */ + virtual void set_max() + { DBUG_ASSERT(0); } + virtual bool is_max() + { DBUG_ASSERT(0); return false; } + + uchar *ptr; // Position to field in record + + field_visibility_t invisible; + /** + Byte where the @c NULL bit is stored inside a record. If this Field is a + @c NOT @c NULL field, this member is @c NULL. + */ + uchar *null_ptr; + /* + Note that you can use table->in_use as replacement for current_thd member + only inside of val_*() and store() members (e.g. you can't use it in cons) + */ + TABLE *table; // Pointer for table + TABLE *orig_table; // Pointer to original table + const char * const *table_name; // Pointer to alias in TABLE + LEX_CSTRING field_name; + LEX_CSTRING comment; + /** reference to the list of options or NULL */ + engine_option_value *option_list; + ha_field_option_struct *option_struct; /* structure with parsed options */ + /* Field is part of the following keys */ + key_map key_start, part_of_key, part_of_key_not_clustered; + + /* + Bitmap of indexes that have records ordered by col1, ... this_field, ... + + For example, INDEX (col(prefix_n)) is not present in col.part_of_sortkey. + */ + key_map part_of_sortkey; + /* + We use three additional unireg types for TIMESTAMP to overcome limitation + of current binary format of .frm file. We'd like to be able to support + NOW() as default and on update value for such fields but unable to hold + this info anywhere except unireg_check field. This issue will be resolved + in more clean way with transition to new text based .frm format. + See also comment for Field_timestamp::Field_timestamp(). + */ + enum utype { + NONE=0, + NEXT_NUMBER=15, // AUTO_INCREMENT + TIMESTAMP_OLD_FIELD=18, // TIMESTAMP created before 4.1.3 + TIMESTAMP_DN_FIELD=21, // TIMESTAMP DEFAULT NOW() + TIMESTAMP_UN_FIELD=22, // TIMESTAMP ON UPDATE NOW() + TIMESTAMP_DNUN_FIELD=23, // TIMESTAMP DEFAULT NOW() ON UPDATE NOW() + TMYSQL_COMPRESSED= 24, // Compatibility with TMySQL + }; + enum imagetype { itRAW, itMBR}; + + utype unireg_check; + uint32 field_length; // Length of field + uint32 flags; + uint16 field_index; // field number in fields array + uchar null_bit; // Bit used to test null bit + /** + If true, this field was created in create_tmp_field_from_item from a NULL + value. This means that the type of the field is just a guess, and the type + may be freely coerced to another type. + + @see create_tmp_field_from_item + @see Item_type_holder::get_real_type + + */ + bool is_created_from_null_item; + + /* + Selectivity of the range condition over this field. + When calculating this selectivity a range predicate + is taken into account only if: + - it is extracted from the WHERE clause + - it depends only on the table the field belongs to + */ + double cond_selectivity; + + /* + The next field in the class of equal fields at the top AND level + of the WHERE clause + */ + Field *next_equal_field; + + /* + This structure is used for statistical data on the column + that has been read from the statistical table column_stat + */ + Column_statistics *read_stats; + /* + This structure is used for statistical data on the column that + is collected by the function collect_statistics_for_table + */ + Column_statistics_collected *collected_stats; + + /* + This is additional data provided for any computed(virtual) field, + default function or check constraint. + In particular it includes a pointer to the item by which this field + can be computed from other fields. + */ + Virtual_column_info *vcol_info, *check_constraint, *default_value; + + Field(uchar *ptr_arg,uint32 length_arg,uchar *null_ptr_arg, + uchar null_bit_arg, utype unireg_check_arg, + const LEX_CSTRING *field_name_arg); + virtual ~Field() {} + + virtual Type_numeric_attributes type_numeric_attributes() const + { + return Type_numeric_attributes(field_length, decimals(), is_unsigned()); + } + Type_std_attributes type_std_attributes() const + { + return Type_std_attributes(type_numeric_attributes(), dtcollation()); + } + + bool is_unsigned() const { return flags & UNSIGNED_FLAG; } + + /** + Convenience definition of a copy function returned by + Field::get_copy_func() + */ + typedef void Copy_func(Copy_field*); + virtual Copy_func *get_copy_func(const Field *from) const= 0; + virtual Copy_func *get_copy_func_to(const Field *to) const + { + return to->get_copy_func(this); + } + /* Store functions returns 1 on overflow and -1 on fatal error */ + virtual int store_field(Field *from) { return from->save_in_field(this); } + virtual int save_in_field(Field *to)= 0; + /** + Check if it is possible just copy the value + of the field 'from' to the field 'this', e.g. for + INSERT INTO t1 (field1) SELECT field2 FROM t2; + @param from - The field to copy from + @retval true - it is possible to just copy value of 'from' to 'this' + @retval false - conversion is needed + */ + virtual bool memcpy_field_possible(const Field *from) const= 0; + virtual bool make_empty_rec_store_default_value(THD *thd, Item *item); + virtual void make_empty_rec_reset(THD *thd) + { + reset(); + } + virtual int store(const char *to, size_t length,CHARSET_INFO *cs)=0; + /* + This is used by engines like CSV and Federated to signal the field + that the data is going to be in text (rather than binary) representation, + even if cs points to &my_charset_bin. + + If a Field distinguishes between text and binary formats (e.g. INET6), + we cannot call store(str,length,&my_charset_bin), + to avoid "field" mis-interpreting the data format as binary. + */ + virtual int store_text(const char *to, size_t length, CHARSET_INFO *cs) + { + return store(to, length, cs); + } + virtual int store_binary(const char *to, size_t length) + { + return store(to, length, &my_charset_bin); + } + virtual int store_hex_hybrid(const char *str, size_t length); + virtual int store(double nr)=0; + virtual int store(longlong nr, bool unsigned_val)=0; + virtual int store_decimal(const my_decimal *d)=0; + virtual int store_time_dec(const MYSQL_TIME *ltime, uint dec); + virtual int store_timestamp_dec(const timeval &ts, uint dec); + int store_timestamp(my_time_t timestamp, ulong sec_part) + { + return store_timestamp_dec(Timeval(timestamp, sec_part), + TIME_SECOND_PART_DIGITS); + } + /** + Store a value represented in native format + */ + virtual int store_native(const Native &value) + { + DBUG_ASSERT(0); + reset(); + return 0; + } + int store_time(const MYSQL_TIME *ltime) + { return store_time_dec(ltime, TIME_SECOND_PART_DIGITS); } + int store(const char *to, size_t length, CHARSET_INFO *cs, + enum_check_fields check_level); + int store_text(const char *to, size_t length, CHARSET_INFO *cs, + enum_check_fields check_level); + int store(const LEX_STRING *ls, CHARSET_INFO *cs) + { + DBUG_ASSERT(ls->length < UINT_MAX32); + return store(ls->str, (uint) ls->length, cs); + } + int store(const LEX_CSTRING *ls, CHARSET_INFO *cs) + { + DBUG_ASSERT(ls->length < UINT_MAX32); + return store(ls->str, (uint) ls->length, cs); + } + int store(const LEX_CSTRING &ls, CHARSET_INFO *cs) + { + DBUG_ASSERT(ls.length < UINT_MAX32); + return store(ls.str, (uint) ls.length, cs); + } + + /* + @brief + Store minimum/maximum value of a column in the statistics table. + @param + field statistical table field + str value buffer + */ + virtual int store_to_statistical_minmax_field(Field *field, String *str); + + /* + @brief + Store minimum/maximum value of a column from the statistical table. + @param + field statistical table field + str value buffer + */ + virtual int store_from_statistical_minmax_field(Field *field, String *str); + +#ifdef HAVE_MEM_CHECK + /** + Mark unused memory in the field as defined. Mainly used to ensure + that if we write full field to disk (for example in + Count_distinct_field::add(), we don't write unitalized data to + disk which would confuse valgrind or MSAN. + */ + virtual void mark_unused_memory_as_defined() {} +#else + void mark_unused_memory_as_defined() {} +#endif + + virtual double val_real()=0; + virtual longlong val_int()=0; + /* + Get ulonglong representation. + Negative values are truncated to 0. + */ + virtual ulonglong val_uint(void) + { + longlong nr= val_int(); + return nr < 0 ? 0 : (ulonglong) nr; + } + virtual bool val_bool()= 0; + virtual my_decimal *val_decimal(my_decimal *)=0; + inline String *val_str(String *str) { return val_str(str, str); } + /* + val_str(buf1, buf2) gets two buffers and should use them as follows: + if it needs a temp buffer to convert result to string - use buf1 + example Field_tiny::val_str() + if the value exists as a string already - use buf2 + example Field_string::val_str() + consequently, buf2 may be created as 'String buf;' - no memory + will be allocated for it. buf1 will be allocated to hold a + value if it's too small. Using allocated buffer for buf2 may result in + an unnecessary free (and later, may be an alloc). + This trickery is used to decrease a number of malloc calls. + */ + virtual String *val_str(String*,String *)=0; + virtual bool val_native(Native *to) + { + DBUG_ASSERT(!is_null()); + return to->copy((const char *) ptr, pack_length()); + } + String *val_int_as_str(String *val_buffer, bool unsigned_flag); + /* + Return the field value as a LEX_CSTRING, without padding to full length + (MODE_PAD_CHAR_TO_FULL_LENGTH is temporarily suppressed during the call). + + In case of an empty value, to[0] is assigned to empty_clex_string, + memory is not allocated. + In case of a non-empty value, the memory is allocated on mem_root. + In case of a memory allocation failure, to[0] is assigned to {NULL,0}. + + @param [IN] mem_root store non-empty values here + @param [OUT to return the string here + @retval false (success) + @retval true (EOM) + */ + bool val_str_nopad(MEM_ROOT *mem_root, LEX_CSTRING *to); + fast_field_copier get_fast_field_copier(const Field *from); + /* + str_needs_quotes() returns TRUE if the value returned by val_str() needs + to be quoted when used in constructing an SQL query. + */ + virtual bool str_needs_quotes() const { return false; } + const Type_handler *type_handler_for_comparison() const + { + return type_handler()->type_handler_for_comparison(); + } + Item_result result_type () const + { + return type_handler()->result_type(); + } + Item_result cmp_type () const + { + return type_handler()->cmp_type(); + } + virtual bool eq(Field *field) + { + return (ptr == field->ptr && null_ptr == field->null_ptr && + null_bit == field->null_bit && field->type() == type()); + } + virtual bool eq_def(const Field *field) const; + + /* + pack_length() returns size (in bytes) used to store field data in memory + (i.e. it returns the maximum size of the field in a row of the table, + which is located in RAM). + */ + virtual uint32 pack_length() const { return (uint32) field_length; } + + /* + pack_length_in_rec() returns size (in bytes) used to store field data on + storage (i.e. it returns the maximal size of the field in a row of the + table, which is located on disk). + */ + virtual uint32 pack_length_in_rec() const { return pack_length(); } + virtual bool compatible_field_size(uint metadata, const Relay_log_info *rli, + uint16 mflags, int *order) const; + virtual uint pack_length_from_metadata(uint field_metadata) const + { + DBUG_ENTER("Field::pack_length_from_metadata"); + DBUG_RETURN(field_metadata); + } + virtual uint row_pack_length() const { return 0; } + + /* + data_length() return the "real size" of the data in memory. + */ + virtual uint32 data_length() { return pack_length(); } + virtual uint32 sort_length() const { return pack_length(); } + + /* + sort_suffix_length() return the length bytes needed to store the length + for binary charset + */ + virtual uint32 sort_suffix_length() const { return 0; } + + /* + Get the number bytes occupied by the value in the field. + CHAR values are stripped of trailing spaces. + Flexible values are stripped of their length. + */ + virtual uint32 value_length() + { + uint len; + if (!zero_pack() && + (type() == MYSQL_TYPE_STRING && + (len= pack_length()) >= 4 && len < 256)) + { + uchar *str, *end; + for (str= ptr, end= str+len; end > str && end[-1] == ' '; end--) {} + len=(uint) (end-str); + return len; + } + return data_length(); + } + + /** + Get the maximum size of the data in packed format. + + @return Maximum data length of the field when packed using the + Field::pack() function. + */ + virtual uint32 max_data_length() const { + return pack_length(); + }; + + virtual int reset() { bzero(ptr,pack_length()); return 0; } + virtual void reset_fields() {} + const uchar *ptr_in_record(const uchar *record) const + { + my_ptrdiff_t l_offset= (my_ptrdiff_t) (ptr - table->record[0]); + DBUG_ASSERT(l_offset >= 0 && table->s->rec_buff_length - l_offset > 0); + return record + l_offset; + } + virtual int set_default(); + + bool has_update_default_function() const + { + return flags & ON_UPDATE_NOW_FLAG; + } + bool has_default_now_unireg_check() const + { + return unireg_check == TIMESTAMP_DN_FIELD + || unireg_check == TIMESTAMP_DNUN_FIELD; + } + + /* + Mark the field as having a value supplied by the client, thus it should + not be auto-updated. + */ + void set_has_explicit_value() + { + bitmap_set_bit(&table->has_value_set, field_index); + } + bool has_explicit_value() + { + return bitmap_is_set(&table->has_value_set, field_index); + } + void clear_has_explicit_value() + { + bitmap_clear_bit(&table->has_value_set, field_index); + } + + virtual my_time_t get_timestamp(const uchar *pos, ulong *sec_part) const + { DBUG_ASSERT(0); return 0; } + my_time_t get_timestamp(ulong *sec_part) const + { + return get_timestamp(ptr, sec_part); + } + + virtual bool binary() const { return 1; } + virtual bool zero_pack() const { return 1; } + virtual enum ha_base_keytype key_type() const { return HA_KEYTYPE_BINARY; } + virtual uint16 key_part_flag() const { return 0; } + virtual uint16 key_part_length_bytes() const { return 0; } + virtual uint32 key_length() const { return pack_length(); } + virtual const Type_handler *type_handler() const= 0; + virtual enum_field_types type() const + { + return type_handler()->field_type(); + } + virtual enum_field_types real_type() const + { + return type_handler()->real_field_type(); + } + virtual enum_field_types binlog_type() const + { + /* + Binlog stores field->type() as type code by default. For example, + it puts MYSQL_TYPE_STRING in case of CHAR, VARCHAR, SET and ENUM, + with extra data type details put into metadata. + + Binlog behaviour slightly differs between various MySQL and MariaDB + versions for the temporal data types TIME, DATETIME and TIMESTAMP. + + MySQL prior to 5.6 uses MYSQL_TYPE_TIME, MYSQL_TYPE_DATETIME + and MYSQL_TYPE_TIMESTAMP type codes in binlog and stores no + additional metadata. + + MariaDB-5.3 implements new versions for TIME, DATATIME, TIMESTAMP + with fractional second precision, but uses the old format for the + types TIME(0), DATETIME(0), TIMESTAMP(0), and it still stores + MYSQL_TYPE_TIME, MYSQL_TYPE_DATETIME and MYSQL_TYPE_TIMESTAMP in binlog, + with no additional metadata. + So row-based replication between temporal data types of + different precision is not possible in MariaDB. + + MySQL-5.6 also implements a new version of TIME, DATETIME, TIMESTAMP + which support fractional second precision 0..6, and use the new + format even for the types TIME(0), DATETIME(0), TIMESTAMP(0). + For these new data types, MySQL-5.6 stores new type codes + MYSQL_TYPE_TIME2, MYSQL_TYPE_DATETIME2, MYSQL_TYPE_TIMESTAMP2 in binlog, + with fractional precision 0..6 put into metadata. + This makes it in theory possible to do row-based replication between + columns of different fractional precision (e.g. from TIME(1) on master + to TIME(6) on slave). However, it's not currently fully implemented yet. + MySQL-5.6 can only do row-based replication from the old types + TIME, DATETIME, TIMESTAMP (represented by MYSQL_TYPE_TIME, + MYSQL_TYPE_DATETIME and MYSQL_TYPE_TIMESTAMP type codes in binlog) + to the new corresponding types TIME(0), DATETIME(0), TIMESTAMP(0). + + Note: MariaDB starting from the version 10.0 understands the new + MySQL-5.6 type codes MYSQL_TYPE_TIME2, MYSQL_TYPE_DATETIME2, + MYSQL_TYPE_TIMESTAMP2. When started over MySQL-5.6 tables both on + master and on slave, MariaDB-10.0 can also do row-based replication + from the old types TIME, DATETIME, TIMESTAMP to the new MySQL-5.6 + types TIME(0), DATETIME(0), TIMESTAMP(0). + + Note: perhaps binlog should eventually be modified to store + real_type() instead of type() for all column types. + */ + return type(); + } + virtual Binlog_type_info binlog_type_info() const + { + DBUG_ASSERT(Field::type() == binlog_type()); + return Binlog_type_info(Field::type(), 0, 0); + } + virtual en_fieldtype tmp_engine_column_type(bool use_packed_rows) const + { + return FIELD_NORMAL; + } + /* + Conversion type for from the source to the current field. + */ + virtual enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) + const= 0; + enum_conv_type rpl_conv_type_from_same_data_type(uint16 metadata, + const Relay_log_info *rli, + const Conv_param ¶m) + const; + inline int cmp(const uchar *str) const { return cmp(ptr,str); } + /* + The following method is used for comparing prefix keys. + Currently it's only used in partitioning. + */ + virtual int cmp_prefix(const uchar *a, const uchar *b, + size_t prefix_len) const + { return cmp(a, b); } + virtual int cmp(const uchar *,const uchar *) const=0; + virtual int cmp_binary(const uchar *a,const uchar *b, uint32 max_length=~0U) const + { return memcmp(a,b,pack_length()); } + virtual int cmp_offset(my_ptrdiff_t row_offset) + { return cmp(ptr,ptr+row_offset); } + virtual int cmp_binary_offset(uint row_offset) + { return cmp_binary(ptr, ptr+row_offset); }; + virtual int key_cmp(const uchar *a,const uchar *b) const + { return cmp(a, b); } + virtual int key_cmp(const uchar *str, uint length) const + { return cmp(ptr,str); } + /* + Update the value m of the 'min_val' field with the current value v + of this field if force_update is set to TRUE or if v < m. + Return TRUE if the value has been updated. + */ + virtual bool update_min(Field *min_val, bool force_update) + { + bool update_fl= force_update || cmp(ptr, min_val->ptr) < 0; + if (update_fl) + { + min_val->set_notnull(); + memcpy(min_val->ptr, ptr, pack_length()); + } + return update_fl; + } + /* + Update the value m of the 'max_val' field with the current value v + of this field if force_update is set to TRUE or if v > m. + Return TRUE if the value has been updated. + */ + virtual bool update_max(Field *max_val, bool force_update) + { + bool update_fl= force_update || cmp(ptr, max_val->ptr) > 0; + if (update_fl) + { + max_val->set_notnull(); + memcpy(max_val->ptr, ptr, pack_length()); + } + return update_fl; + } + virtual void store_field_value(uchar *val, uint len) + { + memcpy(ptr, val, len); + } + virtual uint decimals() const { return 0; } + virtual Information_schema_numeric_attributes + information_schema_numeric_attributes() const + { + return Information_schema_numeric_attributes(); + } + virtual Information_schema_character_attributes + information_schema_character_attributes() const + { + return Information_schema_character_attributes(); + } + virtual void update_data_type_statistics(Data_type_statistics *st) const + { } + /* + Caller beware: sql_type can change str.Ptr, so check + ptr() to see if it changed if you are using your own buffer + in str and restore it with set() if needed + */ + virtual void sql_type(String &str) const =0; + virtual void sql_rpl_type(String *str) const { sql_type(*str); } + virtual uint size_of() const =0; // For new field + inline bool is_null(my_ptrdiff_t row_offset= 0) const + { + /* + The table may have been marked as containing only NULL values + for all fields if it is a NULL-complemented row of an OUTER JOIN + or if the query is an implicitly grouped query (has aggregate + functions but no GROUP BY clause) with no qualifying rows. If + this is the case (in which TABLE::null_row is true), the field + is considered to be NULL. + + Note that if a table->null_row is set then also all null_bits are + set for the row. + + In the case of the 'result_field' for GROUP BY, table->null_row might + refer to the *next* row in the table (when the algorithm is: read the + next row, see if any of group column values have changed, send the + result - grouped - row to the client if yes). So, table->null_row might + be wrong, but such a result_field is always nullable (that's defined by + original_field->maybe_null()) and we trust its null bit. + */ + return null_ptr ? null_ptr[row_offset] & null_bit : table->null_row; + } + inline bool is_real_null(my_ptrdiff_t row_offset= 0) const + { return null_ptr && (null_ptr[row_offset] & null_bit); } + inline bool is_null_in_record(const uchar *record) const + { + if (maybe_null_in_table()) + return record[(uint) (null_ptr - table->record[0])] & null_bit; + return 0; + } + inline void set_null(my_ptrdiff_t row_offset= 0) + { if (null_ptr) null_ptr[row_offset]|= null_bit; } + inline void set_notnull(my_ptrdiff_t row_offset= 0) + { if (null_ptr) null_ptr[row_offset]&= (uchar) ~null_bit; } + inline bool maybe_null(void) const + { return null_ptr != 0 || table->maybe_null; } + // Set to NULL on LOAD DATA or LOAD XML + virtual bool load_data_set_null(THD *thd); + // Reset when a LOAD DATA file ended unexpectedly + virtual bool load_data_set_no_data(THD *thd, bool fixed_format); + void load_data_set_value(const char *pos, uint length, CHARSET_INFO *cs); + + /* @return true if this field is NULL-able (even if temporarily) */ + inline bool real_maybe_null() const { return null_ptr != 0; } + uint null_offset(const uchar *record) const + { return (uint) (null_ptr - record); } + /* + For a NULL-able field (that can actually store a NULL value in a table) + null_ptr points to the "null bitmap" in the table->record[0] header. For + NOT NULL fields it is either 0 or points outside table->record[0] into the + table->triggers->extra_null_bitmap (so that the field can store a NULL + value temporarily, only in memory) + */ + bool maybe_null_in_table() const + { return null_ptr >= table->record[0] && null_ptr <= ptr; } + + uint null_offset() const + { return null_offset(table->record[0]); } + void set_null_ptr(uchar *p_null_ptr, uint p_null_bit) + { + null_ptr= p_null_ptr; + null_bit= static_cast<uchar>(p_null_bit); + } + + bool stored_in_db() const { return !vcol_info || vcol_info->stored_in_db; } + bool check_vcol_sql_mode_dependency(THD *, vcol_init_mode mode) const; + + virtual sql_mode_t value_depends_on_sql_mode() const + { + return 0; + } + virtual sql_mode_t conversion_depends_on_sql_mode(THD *thd, + Item *expr) const + { + return (sql_mode_t) 0; + } + virtual sql_mode_t can_handle_sql_mode_dependency_on_store() const + { + return 0; + } + + inline THD *get_thd() const + { return likely(table) ? table->in_use : current_thd; } + + enum { + LAST_NULL_BYTE_UNDEF= 0 + }; + + /* + Find the position of the last null byte for the field. + + SYNOPSIS + last_null_byte() + + DESCRIPTION + Return a pointer to the last byte of the null bytes where the + field conceptually is placed. + + RETURN VALUE + The position of the last null byte relative to the beginning of + the record. If the field does not use any bits of the null + bytes, the value 0 (LAST_NULL_BYTE_UNDEF) is returned. + */ + size_t last_null_byte() const { + size_t bytes= do_last_null_byte(); + DBUG_PRINT("debug", ("last_null_byte() ==> %ld", (long) bytes)); + DBUG_ASSERT(bytes <= table->s->null_bytes); + return bytes; + } + + /* + Create mem-comparable sort key part for a sort key + */ + void make_sort_key_part(uchar *buff, uint length); + + /* + create a compact sort key which can be compared with a comparison + function. They are called packed sort keys + */ + virtual uint make_packed_sort_key_part(uchar *buff, + const SORT_FIELD_ATTR *sort_field); + + virtual void make_send_field(Send_field *); + + /* + Some implementations actually may write up to 8 bytes regardless of what + size was requested. This is due to the minimum value of the system variable + max_sort_length. + */ + + virtual void sort_string(uchar *buff,uint length)=0; + virtual bool optimize_range(uint idx, uint part) const; + virtual void free() {} + virtual Field *make_new_field(MEM_ROOT *root, TABLE *new_table, + bool keep_type); + virtual Field *new_key_field(MEM_ROOT *root, TABLE *new_table, + uchar *new_ptr, uint32 length, + uchar *new_null_ptr, uint new_null_bit); + Field *create_tmp_field(MEM_ROOT *root, TABLE *new_table, + bool maybe_null_arg); + Field *create_tmp_field(MEM_ROOT *root, TABLE *new_table) + { + return create_tmp_field(root, new_table, maybe_null()); + } + Field *clone(MEM_ROOT *mem_root, TABLE *new_table); + Field *clone(MEM_ROOT *mem_root, TABLE *new_table, my_ptrdiff_t diff); + inline void move_field(uchar *ptr_arg,uchar *null_ptr_arg,uchar null_bit_arg) + { + ptr=ptr_arg; null_ptr=null_ptr_arg; null_bit=null_bit_arg; + } + inline void move_field(uchar *ptr_arg) { ptr=ptr_arg; } + inline uchar *record_ptr() // record[0] or wherever the field was moved to + { + my_ptrdiff_t offset= table->s->field[field_index]->ptr - table->s->default_values; + return ptr - offset; + } + virtual void move_field_offset(my_ptrdiff_t ptr_diff) + { + ptr=ADD_TO_PTR(ptr,ptr_diff, uchar*); + if (null_ptr) + null_ptr=ADD_TO_PTR(null_ptr,ptr_diff,uchar*); + } + void get_image(uchar *buff, uint length, CHARSET_INFO *cs) const + { get_image(buff, length, ptr, cs); } + virtual void get_image(uchar *buff, uint length, + const uchar *ptr_arg, CHARSET_INFO *cs) const + { memcpy(buff,ptr_arg,length); } + virtual void set_image(const uchar *buff,uint length, CHARSET_INFO *cs) + { memcpy(ptr,buff,length); } + + + /* + Copy a field part into an output buffer. + + SYNOPSIS + Field::get_key_image() + buff [out] output buffer + length output buffer size + type itMBR for geometry blobs, otherwise itRAW + + DESCRIPTION + This function makes a copy of field part of size equal to or + less than "length" parameter value. + For fields of string types (CHAR, VARCHAR, TEXT) the rest of buffer + is padded by zero byte. + + NOTES + For variable length character fields (i.e. UTF-8) the "length" + parameter means a number of output buffer bytes as if all field + characters have maximal possible size (mbmaxlen). In the other words, + "length" parameter is a number of characters multiplied by + field_charset->mbmaxlen. + + RETURN + Number of copied bytes (excluding padded zero bytes -- see above). + */ + + uint get_key_image(uchar *buff, uint length, imagetype type_arg) const + { return get_key_image(buff, length, ptr, type_arg); } + virtual uint get_key_image(uchar *buff, uint length, const uchar *ptr_arg, imagetype type_arg) const + { + get_image(buff, length, ptr_arg, &my_charset_bin); + return length; + } + virtual void set_key_image(const uchar *buff,uint length) + { set_image(buff,length, &my_charset_bin); } + inline longlong val_int_offset(uint row_offset) + { + ptr+=row_offset; + longlong tmp=val_int(); + ptr-=row_offset; + return tmp; + } + inline longlong val_int(const uchar *new_ptr) + { + uchar *old_ptr= ptr; + longlong return_value; + ptr= (uchar*) new_ptr; + return_value= val_int(); + ptr= old_ptr; + return return_value; + } + inline String *val_str(String *str, const uchar *new_ptr) + { + uchar *old_ptr= ptr; + ptr= (uchar*) new_ptr; + val_str(str); + ptr= old_ptr; + return str; + } + virtual bool send(Protocol *protocol); + + virtual uchar *pack(uchar *to, const uchar *from, uint max_length); + /** + @overload Field::pack(uchar*, const uchar*, uint, bool) + */ + uchar *pack(uchar *to, const uchar *from) + { + DBUG_ENTER("Field::pack"); + uchar *result= this->pack(to, from, UINT_MAX); + DBUG_RETURN(result); + } + + virtual const uchar *unpack(uchar* to, const uchar *from, + const uchar *from_end, uint param_data=0); + + virtual uint packed_col_length(const uchar *to, uint length) + { return length;} + virtual uint max_packed_col_length(uint max_length) + { return max_length;} + virtual bool is_packable() const { return false; } + + uint offset(const uchar *record) const + { + return (uint) (ptr - record); + } + void copy_from_tmp(int offset); + uint fill_cache_field(struct st_cache_field *copy); + virtual bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate); + virtual longlong val_datetime_packed(THD *thd); + virtual longlong val_time_packed(THD *thd); + virtual const TYPELIB *get_typelib() const { return NULL; } + virtual CHARSET_INFO *charset() const= 0; + virtual const DTCollation &dtcollation() const= 0; + virtual CHARSET_INFO *charset_for_protocol(void) const + { return binary() ? &my_charset_bin : charset(); } + virtual CHARSET_INFO *sort_charset(void) const { return charset(); } + virtual bool has_charset(void) const { return FALSE; } + virtual int set_time() { return 1; } + bool set_warning(Sql_condition::enum_warning_level, unsigned int code, + int cuted_increment, ulong current_row=0) const; + virtual void print_key_value(String *out, uint32 length); + void print_key_part_value(String *out, const uchar *key, uint32 length); + void print_key_value_binary(String *out, const uchar* key, uint32 length); +protected: + bool set_warning(unsigned int code, int cuted_increment) const + { + return set_warning(Sql_condition::WARN_LEVEL_WARN, code, cuted_increment); + } + bool set_note(unsigned int code, int cuted_increment) const + { + return set_warning(Sql_condition::WARN_LEVEL_NOTE, code, cuted_increment); + } + void set_datetime_warning(Sql_condition::enum_warning_level, uint code, + const ErrConv *str, const char *typestr, + int cuted_increment) const; + void set_datetime_warning(uint code, + const ErrConv *str, const char *typestr, + int cuted_increment) const + { + set_datetime_warning(Sql_condition::WARN_LEVEL_WARN, code, str, typestr, + cuted_increment); + } + void set_warning_truncated_wrong_value(const char *type, const char *value); + inline bool check_overflow(int op_result) + { + return (op_result == E_DEC_OVERFLOW); + } + int warn_if_overflow(int op_result); + Copy_func *get_identical_copy_func() const; + bool can_optimize_scalar_range(const RANGE_OPT_PARAM *param, + const KEY_PART *key_part, + const Item_bool_func *cond, + scalar_comparison_op op, + const Item *value) const; + uchar *make_key_image(MEM_ROOT *mem_root, const KEY_PART *key_part); + SEL_ARG *get_mm_leaf_int(RANGE_OPT_PARAM *param, KEY_PART *key_part, + const Item_bool_func *cond, + scalar_comparison_op op, Item *value, + bool unsigned_field); + /* + Make a leaf tree for the cases when the value was stored + to the field exactly, without any truncation, rounding or adjustments. + For example, if we stored an INT value into an INT column, + and value->save_in_field_no_warnings() returned 0, + we know that the value was stored exactly. + */ + SEL_ARG *stored_field_make_mm_leaf_exact(RANGE_OPT_PARAM *param, + KEY_PART *key_part, + scalar_comparison_op op, + Item *value); + /* + Make a leaf tree for the cases when we don't know if + the value was stored to the field without any data loss, + or was modified to a smaller or a greater value. + Used for the data types whose methods Field::store*() + silently adjust the value. This is the most typical case. + */ + SEL_ARG *stored_field_make_mm_leaf(RANGE_OPT_PARAM *param, + KEY_PART *key_part, + scalar_comparison_op op, Item *value); + /* + Make a leaf tree when an INT value was stored into a field of INT type, + and some truncation happened. Tries to adjust the range search condition + when possible, e.g. "tinytint < 300" -> "tinyint <= 127". + Can also return SEL_ARG_IMPOSSIBLE(), and NULL (not sargable). + */ + SEL_ARG *stored_field_make_mm_leaf_bounded_int(RANGE_OPT_PARAM *param, + KEY_PART *key_part, + scalar_comparison_op op, + Item *value, + bool unsigned_field); + /* + Make a leaf tree when some truncation happened during + value->save_in_field_no_warning(this), and we cannot yet adjust the range + search condition for the current combination of the field and the value + data types. + Returns SEL_ARG_IMPOSSIBLE() for "=" and "<=>". + Returns NULL (not sargable) for other comparison operations. + */ + SEL_ARG *stored_field_make_mm_leaf_truncated(RANGE_OPT_PARAM *prm, + scalar_comparison_op, + Item *value); +public: + void set_table_name(String *alias) + { + table_name= &alias->Ptr; + } + void init(TABLE *table_arg) + { + orig_table= table= table_arg; + set_table_name(&table_arg->alias); + } + virtual void init_for_tmp_table(Field *org_field, TABLE *new_table) + { + init(new_table); + orig_table= org_field->orig_table; + vcol_info= 0; + cond_selectivity= 1.0; + next_equal_field= NULL; + option_list= NULL; + option_struct= NULL; + if (org_field->type() == MYSQL_TYPE_VAR_STRING || + org_field->type() == MYSQL_TYPE_VARCHAR) + new_table->s->db_create_options|= HA_OPTION_PACK_RECORD; + } + void init_for_make_new_field(TABLE *new_table_arg, TABLE *orig_table_arg) + { + init(new_table_arg); + /* + Normally orig_table is different from table only if field was + created via ::make_new_field. Here we alter the type of field, + so ::make_new_field is not applicable. But we still need to + preserve the original field metadata for the client-server + protocol. + */ + orig_table= orig_table_arg; + } + + /* maximum possible display length */ + virtual uint32 max_display_length() const= 0; + /** + Whether a field being created has the samle type. + Used by the ALTER TABLE + */ + virtual bool is_equal(const Column_definition &new_field) const= 0; + // Used as double dispatch pattern: calls virtual method of handler + virtual bool + can_be_converted_by_engine(const Column_definition &new_type) const + { + return false; + } + /* convert decimal to longlong with overflow check */ + longlong convert_decimal2longlong(const my_decimal *val, bool unsigned_flag, + int *err); + /* + Maximum number of bytes in character representation. + - For string types it is equal to the field capacity, in bytes. + - For non-string types it represents the longest possible string length + after conversion to string. + */ + virtual uint32 character_octet_length() const + { + return field_length; + } + /* The max. number of characters */ + virtual uint32 char_length() const + { + return field_length / charset()->mbmaxlen; + } + + ha_storage_media field_storage_type() const + { + return (ha_storage_media) + ((flags >> FIELD_FLAGS_STORAGE_MEDIA) & 3); + } + + void set_storage_type(ha_storage_media storage_type_arg) + { + DBUG_ASSERT(field_storage_type() == HA_SM_DEFAULT); + flags |= static_cast<uint32>(storage_type_arg) << + FIELD_FLAGS_STORAGE_MEDIA; + } + + column_format_type column_format() const + { + return (column_format_type) + ((flags >> FIELD_FLAGS_COLUMN_FORMAT) & 3); + } + + void set_column_format(column_format_type column_format_arg) + { + DBUG_ASSERT(column_format() == COLUMN_FORMAT_TYPE_DEFAULT); + flags |= static_cast<uint32>(column_format_arg) << + FIELD_FLAGS_COLUMN_FORMAT; + } + + bool vers_sys_field() const + { + return flags & (VERS_SYS_START_FLAG | VERS_SYS_END_FLAG); + } + + bool vers_update_unversioned() const + { + return flags & VERS_UPDATE_UNVERSIONED_FLAG; + } + + /* + Validate a non-null field value stored in the given record + according to the current thread settings, e.g. sql_mode. + @param thd - the thread + @param record - the record to check in + */ + virtual bool validate_value_in_record(THD *thd, const uchar *record) const + { return false; } + bool validate_value_in_record_with_warn(THD *thd, const uchar *record); + key_map get_possible_keys(); + + /* Hash value */ + virtual void hash(ulong *nr, ulong *nr2); + + /** + Get the upper limit of the MySQL integral and floating-point type. + + @return maximum allowed value for the field + */ + virtual ulonglong get_max_int_value() const + { + DBUG_ASSERT(false); + return 0ULL; + } + +/** + Checks whether a string field is part of write_set. + + @return + FALSE - If field is not char/varchar/.... + - If field is char/varchar/.. and is not part of write set. + TRUE - If field is char/varchar/.. and is part of write set. +*/ + virtual bool is_varchar_and_in_write_set() const { return FALSE; } + + /* Check whether the field can be used as a join attribute in hash join */ + virtual bool hash_join_is_possible() { return TRUE; } + virtual bool eq_cmp_as_binary() { return TRUE; } + + /* Position of the field value within the interval of [min, max] */ + virtual double pos_in_interval(Field *min, Field *max) + { + return (double) 0.5; + } + + /* + Check if comparison between the field and an item unambiguously + identifies a distinct field value. + + Example1: SELECT * FROM t1 WHERE int_column=10; + This example returns distinct integer value of 10. + + Example2: SELECT * FROM t1 WHERE varchar_column=DATE'2001-01-01' + This example returns non-distinct values. + Comparison as DATE will return '2001-01-01' and '2001-01-01x', + but these two values are not equal to each other as VARCHARs. + See also the function with the same name in sql_select.cc. + */ + virtual bool test_if_equality_guarantees_uniqueness(const Item *const_item) + const; + virtual bool can_be_substituted_to_equal_item(const Context &ctx, + const Item_equal *item); + virtual Item *get_equal_const_item(THD *thd, const Context &ctx, + Item *const_item) + { + return const_item; + } + virtual bool can_optimize_keypart_ref(const Item_bool_func *cond, + const Item *item) const; + virtual bool can_optimize_hash_join(const Item_bool_func *cond, + const Item *item) const + { + return can_optimize_keypart_ref(cond, item); + } + virtual bool can_optimize_group_min_max(const Item_bool_func *cond, + const Item *const_item) const; + /** + Test if Field can use range optimizer for a standard comparison operation: + <=, <, =, <=>, >, >= + Note, this method does not cover spatial operations. + */ + virtual bool can_optimize_range(const Item_bool_func *cond, + const Item *item, + bool is_eq_func) const; + + virtual SEL_ARG *get_mm_leaf(RANGE_OPT_PARAM *param, KEY_PART *key_part, + const Item_bool_func *cond, + scalar_comparison_op op, Item *value)= 0; + + bool can_optimize_outer_join_table_elimination(const Item_bool_func *cond, + const Item *item) const + { + // Exactly the same rules with REF access + return can_optimize_keypart_ref(cond, item); + } + + bool save_in_field_default_value(bool view_eror_processing); + bool save_in_field_ignore_value(bool view_error_processing); + + /* Mark field in read map. Updates also virtual fields */ + void register_field_in_read_map(); + + virtual Compression_method *compression_method() const { return 0; } + + virtual Virtual_tmp_table **virtual_tmp_table_addr() + { + return NULL; + } + virtual bool sp_prepare_and_store_item(THD *thd, Item **value); + + friend int cre_myisam(char * name, TABLE *form, uint options, + ulonglong auto_increment_value); + friend class Copy_field; + friend class Item_avg_field; + friend class Item_std_field; + friend class Item_sum_num; + friend class Item_sum_sum; + friend class Item_sum_count; + friend class Item_sum_avg; + friend class Item_sum_std; + friend class Item_sum_min; + friend class Item_sum_max; + friend class Item_func_group_concat; + +private: + /* + Primitive for implementing last_null_byte(). + + SYNOPSIS + do_last_null_byte() + + DESCRIPTION + Primitive for the implementation of the last_null_byte() + function. This represents the inheritance interface and can be + overridden by subclasses. + */ + virtual size_t do_last_null_byte() const; + +protected: + uchar *pack_int(uchar *to, const uchar *from, size_t size) + { + memcpy(to, from, size); + return to + size; + } + + const uchar *unpack_int(uchar* to, const uchar *from, + const uchar *from_end, size_t size) + { + if (from + size > from_end) + return 0; + memcpy(to, from, size); + return from + size; + } + + uchar *pack_int16(uchar *to, const uchar *from) + { return pack_int(to, from, 2); } + const uchar *unpack_int16(uchar* to, const uchar *from, const uchar *from_end) + { return unpack_int(to, from, from_end, 2); } + uchar *pack_int24(uchar *to, const uchar *from) + { return pack_int(to, from, 3); } + const uchar *unpack_int24(uchar* to, const uchar *from, const uchar *from_end) + { return unpack_int(to, from, from_end, 3); } + uchar *pack_int32(uchar *to, const uchar *from) + { return pack_int(to, from, 4); } + const uchar *unpack_int32(uchar* to, const uchar *from, const uchar *from_end) + { return unpack_int(to, from, from_end, 4); } + uchar *pack_int64(uchar* to, const uchar *from) + { return pack_int(to, from, 8); } + const uchar *unpack_int64(uchar* to, const uchar *from, const uchar *from_end) + { return unpack_int(to, from, from_end, 8); } + + double pos_in_interval_val_real(Field *min, Field *max); + double pos_in_interval_val_str(Field *min, Field *max, uint data_offset); +}; + + +class Field_num :public Field { +protected: + int check_edom_and_important_data_truncation(const char *type, bool edom, + CHARSET_INFO *cs, + const char *str, size_t length, + const char *end_of_num); + int check_edom_and_truncation(const char *type, bool edom, + CHARSET_INFO *cs, + const char *str, size_t length, + const char *end_of_num); + int check_int(CHARSET_INFO *cs, const char *str, size_t length, + const char *int_end, int error) + { + return check_edom_and_truncation("integer", + error == MY_ERRNO_EDOM || str == int_end, + cs, str, length, int_end); + } + bool get_int(CHARSET_INFO *cs, const char *from, size_t len, + longlong *rnd, ulonglong unsigned_max, + longlong signed_min, longlong signed_max); + void prepend_zeros(String *value) const; + Item *get_equal_zerofill_const_item(THD *thd, const Context &ctx, + Item *const_item); + Binlog_type_info::binlog_sign_t binlog_signedness() const + { + return (flags & UNSIGNED_FLAG) ? Binlog_type_info::SIGN_UNSIGNED : + Binlog_type_info::SIGN_SIGNED; + } + bool send_numeric_zerofill_str(Protocol_text *protocol, + protocol_send_type_t send_type); + +public: + const uint8 dec; + bool zerofill,unsigned_flag; // Purify cannot handle bit fields + Field_num(uchar *ptr_arg,uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + uint8 dec_arg, bool zero_arg, bool unsigned_arg); + CHARSET_INFO *charset() const override + { + return DTCollation_numeric::singleton().collation; + } + const DTCollation &dtcollation() const override + { + return DTCollation_numeric::singleton(); + } + sql_mode_t can_handle_sql_mode_dependency_on_store() const override; + Item *get_equal_const_item(THD *thd, const Context &ctx, Item *const_item) + override + { + return (flags & ZEROFILL_FLAG) ? + get_equal_zerofill_const_item(thd, ctx, const_item) : + const_item; + } + void add_zerofill_and_unsigned(String &res) const; + friend class Create_field; + void make_send_field(Send_field *) override; + uint decimals() const override { return (uint) dec; } + uint size_of() const override { return sizeof(*this); } + bool eq_def(const Field *field) const override; + Copy_func *get_copy_func(const Field *from) const override + { + if (unsigned_flag && from->cmp_type() == DECIMAL_RESULT) + return do_field_decimal; + return do_field_int; + } + int save_in_field(Field *to) override + { + return to->store(val_int(), MY_TEST(flags & UNSIGNED_FLAG)); + } + bool is_equal(const Column_definition &new_field) const override; + uint row_pack_length() const override { return pack_length(); } + uint32 pack_length_from_metadata(uint field_metadata) const override + { + uint32 length= pack_length(); + DBUG_PRINT("result", ("pack_length_from_metadata(%d): %u", + field_metadata, length)); + return length; + } + double pos_in_interval(Field *min, Field *max) override + { + return pos_in_interval_val_real(min, max); + } + SEL_ARG *get_mm_leaf(RANGE_OPT_PARAM *param, KEY_PART *key_part, + const Item_bool_func *cond, + scalar_comparison_op op, Item *value) override; + Binlog_type_info binlog_type_info() const override + { + DBUG_ASSERT(Field_num::type() == binlog_type()); + return Binlog_type_info(Field_num::type(), 0, 0, binlog_signedness()); + } +}; + + +class Field_str :public Field { +protected: + DTCollation m_collation; + // A short alias for m_collation.collation with non-virtual linkage + const CHARSET_INFO *field_charset() const { return m_collation.collation; } + uint mbmaxlen() const { return m_collation.collation->mbmaxlen; } +public: + bool can_be_substituted_to_equal_item(const Context &ctx, + const Item_equal *item_equal) override; + Field_str(uchar *ptr_arg,uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + const DTCollation &collation); + uint decimals() const override { return is_created_from_null_item ? 0 : NOT_FIXED_DEC; } + int save_in_field(Field *to) override { return save_in_field_str(to); } + bool memcpy_field_possible(const Field *from) const override + { + return real_type() == from->real_type() && + pack_length() == from->pack_length() && + charset() == from->charset(); + } + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int store_decimal(const my_decimal *) override; + int store(const char *to,size_t length,CHARSET_INFO *cs) override=0; + int store_hex_hybrid(const char *str, size_t length) override + { + return store(str, length, &my_charset_bin); + } + CHARSET_INFO *charset() const override { return m_collation.collation; } + const DTCollation &dtcollation() const override + { + return m_collation; + } + bool binary() const override { return field_charset() == &my_charset_bin; } + uint32 max_display_length() const override { return field_length; } + uint32 character_octet_length() const override { return field_length; } + uint32 char_length() const override + { + return field_length / mbmaxlen(); + } + Information_schema_character_attributes + information_schema_character_attributes() const override + { + return Information_schema_character_attributes(max_display_length(), + char_length()); + } + friend class Create_field; + my_decimal *val_decimal(my_decimal *) override; + bool val_bool() override { return val_real() != 0e0; } + bool str_needs_quotes() const override { return true; } + bool eq_cmp_as_binary() override { return MY_TEST(flags & BINARY_FLAG); } + virtual uint length_size() const { return 0; } + double pos_in_interval(Field *min, Field *max) override + { + return pos_in_interval_val_str(min, max, length_size()); + } + bool test_if_equality_guarantees_uniqueness(const Item *const_item) const + override; + SEL_ARG *get_mm_leaf(RANGE_OPT_PARAM *param, KEY_PART *key_part, + const Item_bool_func *cond, + scalar_comparison_op op, Item *value) override; + Binlog_type_info binlog_type_info() const override + { + DBUG_ASSERT(Field_str::type() == binlog_type()); + return Binlog_type_info(Field_str::type(), 0, 0, charset()); + } +}; + +/* base class for Field_string, Field_varstring and Field_blob */ + +class Field_longstr :public Field_str +{ +protected: + int report_if_important_data(const char *ptr, const char *end, + bool count_spaces); + bool check_string_copy_error(const String_copier *copier, + const char *end, CHARSET_INFO *cs); + int check_conversion_status(const String_copier *copier, + const char *end, CHARSET_INFO *cs, + bool count_spaces) + { + if (check_string_copy_error(copier, end, cs)) + return 2; + return report_if_important_data(copier->source_end_pos(), + end, count_spaces); + } + int well_formed_copy_with_check(char *to, size_t to_length, + CHARSET_INFO *from_cs, + const char *from, size_t from_length, + size_t nchars, bool count_spaces, + uint *copy_length) + { + String_copier copier; + + *copy_length= copier.well_formed_copy(field_charset(), to, to_length, + from_cs, from, from_length, + nchars); + + return check_conversion_status(&copier, from + from_length, from_cs, count_spaces); + } + bool cmp_to_string_with_same_collation(const Item_bool_func *cond, + const Item *item) const; + bool cmp_to_string_with_stricter_collation(const Item_bool_func *cond, + const Item *item) const; + int compress(char *to, uint to_length, + const char *from, uint length, + uint max_length, + uint *out_length, + CHARSET_INFO *cs, size_t nchars); + String *uncompress(String *val_buffer, String *val_ptr, + const uchar *from, uint from_length) const; +public: + Field_longstr(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + const DTCollation &collation) + :Field_str(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, unireg_check_arg, + field_name_arg, collation) + {} + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + int store_decimal(const my_decimal *d) override; + uint32 max_data_length() const override; + void make_send_field(Send_field *) override; + bool send(Protocol *protocol) override; + + bool is_varchar_and_in_write_set() const override + { + DBUG_ASSERT(table && table->write_set); + return bitmap_is_set(table->write_set, field_index); + } + bool match_collation_to_optimize_range() const { return true; } + + bool can_optimize_keypart_ref(const Item_bool_func *cond, + const Item *item) const override; + bool can_optimize_hash_join(const Item_bool_func *cond, + const Item *item) const override; + bool can_optimize_group_min_max(const Item_bool_func *cond, + const Item *const_item) const override; + bool can_optimize_range(const Item_bool_func *cond, + const Item *item, + bool is_eq_func) const override; + bool is_packable() const override { return true; } + uint make_packed_sort_key_part(uchar *buff, + const SORT_FIELD_ATTR *sort_field)override; + uchar* pack_sort_string(uchar *to, const SORT_FIELD_ATTR *sort_field); +}; + +/* base class for float and double and decimal (old one) */ +class Field_real :public Field_num { +protected: + double get_double(const char *str, size_t length, CHARSET_INFO *cs, int *err); +public: + bool not_fixed; + + Field_real(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + uint8 dec_arg, bool zero_arg, bool unsigned_arg) + :Field_num(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, unireg_check_arg, + field_name_arg, dec_arg, zero_arg, unsigned_arg), + not_fixed(dec_arg >= FLOATING_POINT_DECIMALS) + {} + Copy_func *get_copy_func(const Field *from) const override + { + return do_field_real; + } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + Information_schema_numeric_attributes + information_schema_numeric_attributes() const override + { + return dec == NOT_FIXED_DEC ? + Information_schema_numeric_attributes(field_length) : + Information_schema_numeric_attributes(field_length, dec); + } + void sql_type(String &str) const override; + int save_in_field(Field *to) override { return to->store(val_real()); } + bool memcpy_field_possible(const Field *from) const override + { + /* + Cannot do memcpy from a longer field to a shorter field, + e.g. a DOUBLE(53,10) into a DOUBLE(10,10). + But it should be OK the other way around. + */ + return real_type() == from->real_type() && + pack_length() == from->pack_length() && + is_unsigned() <= from->is_unsigned() && + decimals() == from->decimals() && + field_length >= from->field_length; + } + int store_decimal(const my_decimal *dec) override + { return store(dec->to_double()); } + int store_time_dec(const MYSQL_TIME *ltime, uint dec) override; + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override; + my_decimal *val_decimal(my_decimal *) override; + bool val_bool() override { return val_real() != 0e0; } + uint32 max_display_length() const override { return field_length; } + uint size_of() const override { return sizeof *this; } + Item *get_equal_const_item(THD *thd, const Context &ctx, Item *const_item) + override; +}; + + +class Field_decimal final :public Field_real { +public: + Field_decimal(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + uint8 dec_arg,bool zero_arg,bool unsigned_arg) + :Field_real(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, + dec_arg, zero_arg, unsigned_arg) + {} + Field *make_new_field(MEM_ROOT *root, TABLE *new_table, bool keep_type) + override; + const Type_handler *type_handler() const override + { return &type_handler_olddecimal; } + enum ha_base_keytype key_type() const override + { return zerofill ? HA_KEYTYPE_BINARY : HA_KEYTYPE_NUM; } + Information_schema_numeric_attributes + information_schema_numeric_attributes() const override + { + uint tmp= dec ? 2 : 1; // The sign and the decimal point + return Information_schema_numeric_attributes(field_length - tmp, dec); + } + Copy_func *get_copy_func(const Field *from) const override + { + return eq_def(from) ? get_identical_copy_func() : do_field_string; + } + int reset() override; + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + void overflow(bool negative); + bool zero_pack() const override { return false; } + void sql_type(String &str) const override; + uchar *pack(uchar* to, const uchar *from, uint max_length) override + { + return Field::pack(to, from, max_length); + } +}; + + +/* New decimal/numeric field which use fixed point arithmetic */ +class Field_new_decimal final :public Field_num { +public: + /* The maximum number of decimal digits can be stored */ + uint precision; + uint bin_size; + /* + Constructors take max_length of the field as a parameter - not the + precision as the number of decimal digits allowed. + So for example we need to count length from precision handling + CREATE TABLE ( DECIMAL(x,y)) + */ + Field_new_decimal(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + uint8 dec_arg, bool zero_arg, bool unsigned_arg); + const Type_handler *type_handler() const override + { return &type_handler_newdecimal; } + enum ha_base_keytype key_type() const override { return HA_KEYTYPE_BINARY; } + Copy_func *get_copy_func(const Field *from) const override + { + // if (from->real_type() == MYSQL_TYPE_BIT) // QQ: why? + // return do_field_int; + return do_field_decimal; + } + int save_in_field(Field *to) override + { + my_decimal tmp(ptr, precision, dec); + return to->store_decimal(&tmp); + } + bool memcpy_field_possible(const Field *from) const override + { + return real_type() == from->real_type() && + pack_length() == from->pack_length() && + is_unsigned() <= from->is_unsigned() && + decimals() == from->decimals() && + field_length == from->field_length; + } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + int reset() override; + bool store_value(const my_decimal *decimal_value); + bool store_value(const my_decimal *decimal_value, int *native_error); + void set_value_on_overflow(my_decimal *decimal_value, bool sign); + int store(const char *to, size_t length, CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int store_time_dec(const MYSQL_TIME *ltime, uint dec) override; + int store_decimal(const my_decimal *) override; + double val_real() override + { + return my_decimal(ptr, precision, dec).to_double(); + } + longlong val_int() override + { + return my_decimal(ptr, precision, dec).to_longlong(unsigned_flag); + } + ulonglong val_uint() override + { + return (ulonglong) my_decimal(ptr, precision, dec).to_longlong(true); + } + my_decimal *val_decimal(my_decimal *) override; + String *val_str(String *val_buffer, String *) override + { + uint fixed_precision= zerofill ? precision : 0; + return my_decimal(ptr, precision, dec). + to_string(val_buffer, fixed_precision, dec, '0'); + } + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override + { + my_decimal nr(ptr, precision, dec); + return decimal_to_datetime_with_warn(get_thd(), &nr, ltime, + fuzzydate, table->s, field_name.str); + } + bool val_bool() override + { + return my_decimal(ptr, precision, dec).to_bool(); + } + int cmp(const uchar *, const uchar *) const override; + void sort_string(uchar *buff, uint length) override; + bool zero_pack() const override { return false; } + void sql_type(String &str) const override; + uint32 max_display_length() const override { return field_length; } + Information_schema_numeric_attributes + information_schema_numeric_attributes() const override + { + return Information_schema_numeric_attributes(precision, dec); + } + uint size_of() const override { return sizeof *this; } + uint32 pack_length() const override { return (uint32) bin_size; } + uint pack_length_from_metadata(uint field_metadata) const override; + uint row_pack_length() const override { return pack_length(); } + bool compatible_field_size(uint field_metadata, const Relay_log_info *rli, + uint16 mflags, int *order_var) const override; + bool is_equal(const Column_definition &new_field) const override; + const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end, + uint param_data) override; + Item *get_equal_const_item(THD *thd, const Context &ctx, Item *const_item) + override; + Binlog_type_info binlog_type_info() const override; +}; + + +class Field_int :public Field_num +{ +protected: + String *val_str_from_long(String *val_buffer, uint max_char_length, + int radix, long nr); +public: + Field_int(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, bool zero_arg, bool unsigned_arg) + :Field_num(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, 0, zero_arg, unsigned_arg) + {} + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + bool memcpy_field_possible(const Field *from) const override + { + return real_type() == from->real_type() && + pack_length() == from->pack_length() && + is_unsigned() == from->is_unsigned(); + } + int store_decimal(const my_decimal *) override; + my_decimal *val_decimal(my_decimal *) override; + bool val_bool() override { return val_int() != 0; } + ulonglong val_uint() override + { + longlong nr= val_int(); + return nr < 0 && !unsigned_flag ? 0 : (ulonglong) nr; + } + int store_time_dec(const MYSQL_TIME *ltime, uint dec) override; + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override; + virtual const Type_limits_int *type_limits_int() const= 0; + uint32 max_display_length() const override + { + return type_limits_int()->char_length(); + } + Type_numeric_attributes type_numeric_attributes() const override + { + /* + For integer data types, the user-specified length does not constrain the + supported range, so e.g. a column of the INT(1) data type supports the + full integer range anyway. + Choose the maximum from the user-specified length and the maximum + possible length determined by the data type capacity: + INT(1) -> 11 + INT(10) -> 11 + INT(40) -> 40 + */ + uint32 length1= max_display_length(); + uint32 length2= field_length; + return Type_numeric_attributes(MY_MAX(length1, length2), + decimals(), is_unsigned()); + } + Information_schema_numeric_attributes + information_schema_numeric_attributes() const override + { + uint32 prec= type_limits_int()->precision(); + return Information_schema_numeric_attributes(prec, 0); + } + void sql_type(String &str) const override; + SEL_ARG *get_mm_leaf(RANGE_OPT_PARAM *param, KEY_PART *key_part, + const Item_bool_func *cond, + scalar_comparison_op op, Item *value) override + { + return get_mm_leaf_int(param, key_part, cond, op, value, unsigned_flag); + } +}; + + +class Field_tiny :public Field_int +{ + const Type_handler_general_purpose_int *type_handler_priv() const + { + if (is_unsigned()) + return &type_handler_utiny; + return &type_handler_stiny; + } +public: + Field_tiny(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + bool zero_arg, bool unsigned_arg) + :Field_int(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, zero_arg, unsigned_arg) + {} + const Type_handler *type_handler() const override + { return type_handler_priv(); } + enum ha_base_keytype key_type() const override + { return unsigned_flag ? HA_KEYTYPE_BINARY : HA_KEYTYPE_INT8; } + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int reset() override { ptr[0]=0; return 0; } + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + bool send(Protocol *protocol) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override { return 1; } + const Type_limits_int *type_limits_int() const override + { + return type_handler_priv()->type_limits_int(); + } + + uchar *pack(uchar* to, const uchar *from, uint max_length) override + { + *to= *from; + return to + 1; + } + + const uchar *unpack(uchar* to, const uchar *from, + const uchar *from_end, uint param_data) override + { + if (from == from_end) + return 0; + *to= *from; + return from + 1; + } + ulonglong get_max_int_value() const override + { + return unsigned_flag ? 0xFFULL : 0x7FULL; + } +}; + + +class Field_short final :public Field_int +{ + const Type_handler_general_purpose_int *type_handler_priv() const + { + if (is_unsigned()) + return &type_handler_ushort; + return &type_handler_sshort; + } +public: + Field_short(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + bool zero_arg, bool unsigned_arg) + :Field_int(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, zero_arg, unsigned_arg) + {} + Field_short(uint32 len_arg,bool maybe_null_arg, + const LEX_CSTRING *field_name_arg, + bool unsigned_arg) + :Field_int((uchar*) 0, len_arg, maybe_null_arg ? (uchar*) "": 0,0, + NONE, field_name_arg, 0, unsigned_arg) + {} + const Type_handler *type_handler() const override + { return type_handler_priv(); } + enum ha_base_keytype key_type() const override + { return unsigned_flag ? HA_KEYTYPE_USHORT_INT : HA_KEYTYPE_SHORT_INT;} + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int reset() override { ptr[0]=ptr[1]=0; return 0; } + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + bool send(Protocol *protocol) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override { return 2; } + const Type_limits_int *type_limits_int() const override + { + return type_handler_priv()->type_limits_int(); + } + uchar *pack(uchar* to, const uchar *from, uint) override + { return pack_int16(to, from); } + + const uchar *unpack(uchar* to, const uchar *from, + const uchar *from_end, uint) override + { return unpack_int16(to, from, from_end); } + ulonglong get_max_int_value() const override + { + return unsigned_flag ? 0xFFFFULL : 0x7FFFULL; + } +}; + +class Field_medium final :public Field_int +{ + const Type_handler_general_purpose_int *type_handler_priv() const + { + if (is_unsigned()) + return &type_handler_uint24; + return &type_handler_sint24; + } +public: + Field_medium(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + bool zero_arg, bool unsigned_arg) + :Field_int(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, zero_arg, unsigned_arg) + {} + const Type_handler *type_handler() const override + { return type_handler_priv(); } + enum ha_base_keytype key_type() const override + { return unsigned_flag ? HA_KEYTYPE_UINT24 : HA_KEYTYPE_INT24; } + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int reset() override { ptr[0]=ptr[1]=ptr[2]=0; return 0; } + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + bool send(Protocol *protocol) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override { return 3; } + const Type_limits_int *type_limits_int() const override + { + return type_handler_priv()->type_limits_int(); + } + uchar *pack(uchar* to, const uchar *from, uint max_length) override + { + return Field::pack(to, from, max_length); + } + ulonglong get_max_int_value() const override + { + return unsigned_flag ? 0xFFFFFFULL : 0x7FFFFFULL; + } +}; + + +class Field_long final :public Field_int +{ + const Type_handler_general_purpose_int *type_handler_priv() const + { + if (is_unsigned()) + return &type_handler_ulong; + return &type_handler_slong; + } +public: + Field_long(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + bool zero_arg, bool unsigned_arg) + :Field_int(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, zero_arg, unsigned_arg) + {} + Field_long(uint32 len_arg,bool maybe_null_arg, + const LEX_CSTRING *field_name_arg, + bool unsigned_arg) + :Field_int((uchar*) 0, len_arg, maybe_null_arg ? (uchar*) "": 0,0, + NONE, field_name_arg, 0, unsigned_arg) + {} + const Type_handler *type_handler() const override + { return type_handler_priv(); } + enum ha_base_keytype key_type() const override + { return unsigned_flag ? HA_KEYTYPE_ULONG_INT : HA_KEYTYPE_LONG_INT; } + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int reset() override { ptr[0]=ptr[1]=ptr[2]=ptr[3]=0; return 0; } + double val_real() override; + longlong val_int() override; + bool send(Protocol *protocol) override; + String *val_str(String *, String *) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override { return 4; } + const Type_limits_int *type_limits_int() const override + { + return type_handler_priv()->type_limits_int(); + } + uchar *pack(uchar* to, const uchar *from, uint) override + { + return pack_int32(to, from); + } + const uchar *unpack(uchar* to, const uchar *from, + const uchar *from_end, uint) override + { + return unpack_int32(to, from, from_end); + } + ulonglong get_max_int_value() const override + { + return unsigned_flag ? 0xFFFFFFFFULL : 0x7FFFFFFFULL; + } +}; + + +class Field_longlong :public Field_int +{ + const Type_handler_general_purpose_int *type_handler_priv() const + { + if (is_unsigned()) + return &type_handler_ulonglong; + return &type_handler_slonglong; + } +public: + Field_longlong(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + bool zero_arg, bool unsigned_arg) + :Field_int(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, zero_arg, unsigned_arg) + {} + Field_longlong(uint32 len_arg,bool maybe_null_arg, + const LEX_CSTRING *field_name_arg, + bool unsigned_arg) + :Field_int((uchar*) 0, len_arg, maybe_null_arg ? (uchar*) "": 0,0, + NONE, field_name_arg, 0, unsigned_arg) + {} + const Type_handler *type_handler() const override + { return type_handler_priv(); } + enum ha_base_keytype key_type() const override + { return unsigned_flag ? HA_KEYTYPE_ULONGLONG : HA_KEYTYPE_LONGLONG; } + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int reset() override + { + ptr[0]=ptr[1]=ptr[2]=ptr[3]=ptr[4]=ptr[5]=ptr[6]=ptr[7]=0; + return 0; + } + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + bool send(Protocol *protocol) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override { return 8; } + const Type_limits_int *type_limits_int() const override + { + return type_handler_priv()->type_limits_int(); + } + uchar *pack(uchar* to, const uchar *from, uint) override + { + return pack_int64(to, from); + } + const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end, + uint) override + { + return unpack_int64(to, from, from_end); + } + void set_max() override; + bool is_max() override; + ulonglong get_max_int_value() const override + { + return unsigned_flag ? 0xFFFFFFFFFFFFFFFFULL : 0x7FFFFFFFFFFFFFFFULL; + } +}; + + +class Field_vers_trx_id :public Field_longlong { + MYSQL_TIME cache; + ulonglong cached; +public: + Field_vers_trx_id(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, bool zero_arg, + bool unsigned_arg) + : Field_longlong(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, zero_arg, + unsigned_arg), + cached(0) + {} + const Type_handler *type_handler() const override + { return &type_handler_vers_trx_id; } + uint size_of() const override { return sizeof *this; } + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate, ulonglong trx_id); + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override + { + return get_date(ltime, fuzzydate, (ulonglong) val_int()); + } + bool test_if_equality_guarantees_uniqueness(const Item *item) const override; + bool can_optimize_keypart_ref(const Item_bool_func *, const Item *) + const override + { + return true; + } + + bool can_optimize_group_min_max(const Item_bool_func *, const Item *) + const override + { + return true; + } + bool can_optimize_range(const Item_bool_func *, const Item *, bool) + const override + { + return true; + } + /* cmp_type() cannot be TIME_RESULT, because we want to compare this field against + integers. But in all other cases we treat it as TIME_RESULT! */ +}; + + +class Field_float final :public Field_real { +public: + Field_float(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + uint8 dec_arg,bool zero_arg,bool unsigned_arg) + :Field_real(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, + dec_arg, zero_arg, unsigned_arg) + { + if (dec_arg >= FLOATING_POINT_DECIMALS) + dec_arg= NOT_FIXED_DEC; + } + Field_float(uint32 len_arg, bool maybe_null_arg, + const LEX_CSTRING *field_name_arg, uint8 dec_arg) + :Field_real((uchar*) 0, len_arg, maybe_null_arg ? (uchar*) "": 0, (uint) 0, + NONE, field_name_arg, dec_arg, 0, 0) + { + if (dec_arg >= FLOATING_POINT_DECIMALS) + dec_arg= NOT_FIXED_DEC; + } + const Type_handler *type_handler() const override + { return &type_handler_float; } + enum ha_base_keytype key_type() const override { return HA_KEYTYPE_FLOAT; } + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int reset() override { bzero(ptr,sizeof(float)); return 0; } + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + bool send(Protocol *protocol) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff, uint length) override; + uint32 pack_length() const override { return sizeof(float); } + uint row_pack_length() const override { return pack_length(); } + ulonglong get_max_int_value() const override + { + /* + We use the maximum as per IEEE754-2008 standard, 2^24 + */ + return 0x1000000ULL; + } + Binlog_type_info binlog_type_info() const override; +}; + + +class Field_double :public Field_real { + longlong val_int_from_real(bool want_unsigned_result); +public: + Field_double(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + uint8 dec_arg,bool zero_arg,bool unsigned_arg) + :Field_real(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, + dec_arg, zero_arg, unsigned_arg) + { + if (dec_arg >= FLOATING_POINT_DECIMALS) + dec_arg= NOT_FIXED_DEC; + } + Field_double(uint32 len_arg, bool maybe_null_arg, + const LEX_CSTRING *field_name_arg, uint8 dec_arg) + :Field_real((uchar*) 0, len_arg, maybe_null_arg ? (uchar*) "" : 0, (uint) 0, + NONE, field_name_arg, dec_arg, 0, 0) + { + if (dec_arg >= FLOATING_POINT_DECIMALS) + dec_arg= NOT_FIXED_DEC; + } + Field_double(uint32 len_arg, bool maybe_null_arg, + const LEX_CSTRING *field_name_arg, + uint8 dec_arg, bool not_fixed_arg) + :Field_real((uchar*) 0, len_arg, maybe_null_arg ? (uchar*) "" : 0, (uint) 0, + NONE, field_name_arg, dec_arg, 0, 0) + { + not_fixed= not_fixed_arg; + if (dec_arg >= FLOATING_POINT_DECIMALS) + dec_arg= NOT_FIXED_DEC; + } + void init_for_tmp_table(Field *org_field, TABLE *new_table) override + { + Field::init_for_tmp_table(org_field, new_table); + not_fixed= true; + } + const Type_handler *type_handler() const override + { return &type_handler_double; } + enum ha_base_keytype key_type() const override final { return HA_KEYTYPE_DOUBLE; } + int store(const char *to,size_t length,CHARSET_INFO *charset) override final; + int store(double nr) override final; + int store(longlong nr, bool unsigned_val) override final; + int reset() override final { bzero(ptr,sizeof(double)); return 0; } + double val_real() override final; + longlong val_int() override final { return val_int_from_real(false); } + ulonglong val_uint() override final { return (ulonglong) val_int_from_real(true); } + String *val_str(String *, String *) override final; + bool send(Protocol *protocol) override; + int cmp(const uchar *,const uchar *) const override final; + void sort_string(uchar *buff, uint length) override final; + uint32 pack_length() const override final { return sizeof(double); } + uint row_pack_length() const override final { return pack_length(); } + ulonglong get_max_int_value() const override final + { + /* + We use the maximum as per IEEE754-2008 standard, 2^53 + */ + return 0x20000000000000ULL; + } + Binlog_type_info binlog_type_info() const override final; +}; + + +/* Everything saved in this will disappear. It will always return NULL */ + +class Field_null :public Field_str { + static uchar null[1]; +public: + Field_null(uchar *ptr_arg, uint32 len_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + const DTCollation &collation) + :Field_str(ptr_arg, len_arg, null, 1, + unireg_check_arg, field_name_arg, collation) + {} + const Type_handler *type_handler() const override + { return &type_handler_null; } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + Information_schema_character_attributes + information_schema_character_attributes() const override + { + return Information_schema_character_attributes(); + } + Copy_func *get_copy_func(const Field *from) const override + { + return do_field_string; + } + int store(const char *to, size_t length, CHARSET_INFO *cs) override final + { null[0]=1; return 0; } + int store(double nr) override final { null[0]=1; return 0; } + int store(longlong nr, bool unsigned_val) override final { null[0]=1; return 0; } + int store_decimal(const my_decimal *d) override final { null[0]=1; return 0; } + int reset() override final { return 0; } + double val_real() override final { return 0.0;} + longlong val_int() override final { return 0;} + bool val_bool() override final { return false; } + my_decimal *val_decimal(my_decimal *) override final { return 0; } + String *val_str(String *value,String *value2) override final + { value2->length(0); return value2;} + bool is_equal(const Column_definition &new_field) const override final; + int cmp(const uchar *a, const uchar *b) const override final { return 0;} + void sort_string(uchar *buff, uint length) override final {} + uint32 pack_length() const override final { return 0; } + void sql_type(String &str) const override final; + uint size_of() const override final { return sizeof *this; } + uint32 max_display_length() const override final { return 4; } + void move_field_offset(my_ptrdiff_t ptr_diff) override final {} + bool can_optimize_keypart_ref(const Item_bool_func *cond, + const Item *item) const override final + { + return false; + } + bool can_optimize_group_min_max(const Item_bool_func *cond, + const Item *const_item) const override final + { + return false; + } +}; + + +class Field_temporal :public Field { +protected: + Item *get_equal_const_item_datetime(THD *thd, const Context &ctx, + Item *const_item); + void set_warnings(Sql_condition::enum_warning_level trunc_level, + const ErrConv *str, int was_cut, const char *typestr); + int store_TIME_return_code_with_warnings(int warn, const ErrConv *str, + const char *typestr) + { + if (!MYSQL_TIME_WARN_HAVE_WARNINGS(warn) && + MYSQL_TIME_WARN_HAVE_NOTES(warn)) + { + set_warnings(Sql_condition::WARN_LEVEL_NOTE, str, + warn | MYSQL_TIME_WARN_TRUNCATED, typestr); + return 3; + } + set_warnings(Sql_condition::WARN_LEVEL_WARN, str, warn, typestr); + return warn ? 2 : 0; + } + int store_invalid_with_warning(const ErrConv *str, int was_cut, + const char *typestr) + { + DBUG_ASSERT(was_cut); + reset(); + Sql_condition::enum_warning_level level= Sql_condition::WARN_LEVEL_WARN; + if (was_cut & MYSQL_TIME_WARN_ZERO_DATE) + { + set_warnings(level, str, MYSQL_TIME_WARN_OUT_OF_RANGE, typestr); + return 2; + } + set_warnings(level, str, MYSQL_TIME_WARN_TRUNCATED, typestr); + return 1; + } + void sql_type_comment(String &str, + const Name &name, + const Name &comment) const; + void sql_type_dec_comment(String &str, + const Name &name, uint dec, + const Name &comment) const; + void sql_type_opt_dec_comment(String &str, + const Name &name, uint dec, + const Name &comment) const + { + if (dec) + sql_type_dec_comment(str, name, dec, comment); + else + sql_type_comment(str, name, comment); + } + static const Name &type_version_mysql56(); +public: + Field_temporal(uchar *ptr_arg,uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, utype unireg_check_arg, + const LEX_CSTRING *field_name_arg) + :Field(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, unireg_check_arg, + field_name_arg) + { flags|= BINARY_FLAG; } + int store_hex_hybrid(const char *str, size_t length) override + { + return store(str, length, &my_charset_bin); + } + sql_mode_t can_handle_sql_mode_dependency_on_store() const override; + Copy_func *get_copy_func(const Field *from) const override; + int save_in_field(Field *to) override + { + MYSQL_TIME ltime; + // For temporal types no truncation needed. Rounding mode is not important. + if (get_date(<ime, TIME_CONV_NONE | TIME_FRAC_NONE)) + return to->reset(); + return to->store_time_dec(<ime, decimals()); + } + bool memcpy_field_possible(const Field *from) const override; + uint32 max_display_length() const override { return field_length; } + bool str_needs_quotes() const override { return true; } + CHARSET_INFO *charset() const override + { + return DTCollation_numeric::singleton().collation; + } + const DTCollation &dtcollation() const override + { + return DTCollation_numeric::singleton(); + } + CHARSET_INFO *sort_charset() const override { return &my_charset_bin; } + bool binary() const override { return true; } + bool val_bool() override { return val_real() != 0e0; } + bool is_equal(const Column_definition &new_field) const override; + bool eq_def(const Field *field) const override + { + return (Field::eq_def(field) && decimals() == field->decimals()); + } + my_decimal *val_decimal(my_decimal*) override; + double pos_in_interval(Field *min, Field *max) override + { + return pos_in_interval_val_real(min, max); + } + bool can_optimize_keypart_ref(const Item_bool_func *cond, + const Item *item) const override; + bool can_optimize_group_min_max(const Item_bool_func *cond, + const Item *const_item) const override; + bool can_optimize_range(const Item_bool_func *cond, + const Item *item, + bool is_eq_func) const override + { + return true; + } + SEL_ARG *get_mm_leaf(RANGE_OPT_PARAM *param, KEY_PART *key_part, + const Item_bool_func *cond, + scalar_comparison_op op, Item *value) override; +}; + + +/** + Abstract class for: + - DATE + - DATETIME + - DATETIME(1..6) + - DATETIME(0..6) - MySQL56 version +*/ +class Field_temporal_with_date :public Field_temporal { +protected: + virtual void store_TIME(const MYSQL_TIME *ltime) = 0; + void store_datetime(const Datetime &dt) + { + return store_TIME(dt.get_mysql_time()); + } + virtual bool get_TIME(MYSQL_TIME *ltime, const uchar *pos, + date_mode_t fuzzydate) const = 0; + bool validate_MMDD(bool not_zero_date, uint month, uint day, + date_mode_t fuzzydate) const + { + if (!not_zero_date) + return bool(fuzzydate & TIME_NO_ZERO_DATE); + if (!month || !day) + return bool(fuzzydate & TIME_NO_ZERO_IN_DATE); + return false; + } +public: + Field_temporal_with_date(uchar *ptr_arg, uint32 len_arg, + uchar *null_ptr_arg, uchar null_bit_arg, + utype unireg_check_arg, + const LEX_CSTRING *field_name_arg) + :Field_temporal(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg) + {} + bool validate_value_in_record(THD *thd, const uchar *record) const; +}; + + +class Field_timestamp :public Field_temporal { +protected: + int store_TIME_with_warning(THD *, const Datetime *, + const ErrConv *, int warn); + virtual void store_TIMEVAL(const timeval &tv)= 0; + void store_TIMESTAMP(const Timestamp &ts) + { + store_TIMEVAL(ts.tv()); + } + int zero_time_stored_return_code_with_warning(); +public: + Field_timestamp(uchar *ptr_arg, uint32 len_arg, + uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + TABLE_SHARE *share); + const Type_handler *type_handler() const override + { return &type_handler_timestamp; } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + Copy_func *get_copy_func(const Field *from) const override; + sql_mode_t conversion_depends_on_sql_mode(THD *, Item *) const override; + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int store_time_dec(const MYSQL_TIME *ltime, uint dec) override; + int store_decimal(const my_decimal *) override; + int store_timestamp_dec(const timeval &ts, uint dec) override; + int save_in_field(Field *to) override; + longlong val_int() override; + String *val_str(String *, String *) override; + bool zero_pack() const override { return false; } + /* + This method is used by storage/perfschema and + Item_func_now_local::save_in_field(). + */ + void store_TIME(my_time_t ts, ulong sec_part) + { + int warn; + time_round_mode_t mode= Datetime::default_round_mode(get_thd()); + store_TIMESTAMP(Timestamp(ts, sec_part).round(decimals(), mode, &warn)); + } + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override; + int store_native(const Native &value) override; + bool validate_value_in_record(THD *thd, const uchar *record) const override; + Item *get_equal_const_item(THD *thd, const Context &ctx, Item *const_item) + override + { + return get_equal_const_item_datetime(thd, ctx, const_item); + } + bool load_data_set_null(THD *thd) override; + bool load_data_set_no_data(THD *thd, bool fixed_format) override; +}; + + +class Field_timestamp0 :public Field_timestamp +{ + void store_TIMEVAL(const timeval &tv) override + { + int4store(ptr, tv.tv_sec); + } +public: + Field_timestamp0(uchar *ptr_arg, uint32 len_arg, + uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + TABLE_SHARE *share) + :Field_timestamp(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, share) + { } + enum ha_base_keytype key_type() const override + { return HA_KEYTYPE_ULONG_INT; } + void sql_type(String &str) const override + { + sql_type_comment(str, Field_timestamp0::type_handler()->name(), + Type_handler::version_mariadb53()); + } + double val_real() override + { + return (double) Field_timestamp0::val_int(); + } + bool send(Protocol *protocol) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override { return 4; } + int set_time() override; + /* Get TIMESTAMP field value as seconds since begging of Unix Epoch */ + my_time_t get_timestamp(const uchar *pos, ulong *sec_part) const override; + bool val_native(Native *to) override; + uchar *pack(uchar *to, const uchar *from, uint) override + { + return pack_int32(to, from); + } + const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end, + uint) override + { + return unpack_int32(to, from, from_end); + } + uint size_of() const override { return sizeof *this; } +}; + + +/** + Abstract class for: + - TIMESTAMP(1..6) + - TIMESTAMP(0..6) - MySQL56 version +*/ +class Field_timestamp_with_dec :public Field_timestamp { +protected: + uint dec; +public: + Field_timestamp_with_dec(uchar *ptr_arg, + uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + TABLE_SHARE *share, uint dec_arg) : + Field_timestamp(ptr_arg, + MAX_DATETIME_WIDTH + dec_arg + MY_TEST(dec_arg), null_ptr_arg, + null_bit_arg, unireg_check_arg, field_name_arg, share), + dec(dec_arg) + { + DBUG_ASSERT(dec <= TIME_SECOND_PART_DIGITS); + } + uint decimals() const override { return dec; } + enum ha_base_keytype key_type() const override { return HA_KEYTYPE_BINARY; } + uchar *pack(uchar *to, const uchar *from, uint max_length) override + { return Field::pack(to, from, max_length); } + const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end, + uint param_data) override + { return Field::unpack(to, from, from_end, param_data); } + void make_send_field(Send_field *field) override; + void sort_string(uchar *to, uint length) override + { + DBUG_ASSERT(length == pack_length()); + memcpy(to, ptr, length); + } + bool send(Protocol *protocol) override; + double val_real() override; + my_decimal* val_decimal(my_decimal*) override; + int set_time() override; +}; + + +class Field_timestamp_hires :public Field_timestamp_with_dec { + uint sec_part_bytes(uint dec) const + { + return Type_handler_timestamp::sec_part_bytes(dec); + } + void store_TIMEVAL(const timeval &tv) override; +public: + Field_timestamp_hires(uchar *ptr_arg, + uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + TABLE_SHARE *share, uint dec_arg) : + Field_timestamp_with_dec(ptr_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, share, dec_arg) + { + DBUG_ASSERT(dec); + } + void sql_type(String &str) const override + { + sql_type_dec_comment(str, Field_timestamp_hires::type_handler()->name(), + dec, Type_handler::version_mariadb53()); + } + bool val_native(Native *to) override; + my_time_t get_timestamp(const uchar *pos, ulong *sec_part) const override; + int cmp(const uchar *,const uchar *) const override; + uint32 pack_length() const override { return 4 + sec_part_bytes(dec); } + uint size_of() const override { return sizeof *this; } +}; + + +/** + TIMESTAMP(0..6) - MySQL56 version +*/ +class Field_timestampf final :public Field_timestamp_with_dec { + void store_TIMEVAL(const timeval &tv) override; +public: + Field_timestampf(uchar *ptr_arg, + uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + TABLE_SHARE *share, uint dec_arg) : + Field_timestamp_with_dec(ptr_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, share, dec_arg) + {} + const Type_handler *type_handler() const override + { return &type_handler_timestamp2; } + enum_field_types binlog_type() const override + { return MYSQL_TYPE_TIMESTAMP2; } + void sql_type(String &str) const override + { + sql_type_opt_dec_comment(str, Field_timestampf::type_handler()->name(), + dec, type_version_mysql56()); + + } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + uint32 pack_length() const override + { + return my_timestamp_binary_length(dec); + } + uint row_pack_length() const override { return pack_length(); } + uint pack_length_from_metadata(uint field_metadata) const override + { + DBUG_ENTER("Field_timestampf::pack_length_from_metadata"); + uint tmp= my_timestamp_binary_length(field_metadata); + DBUG_RETURN(tmp); + } + int cmp(const uchar *a_ptr,const uchar *b_ptr) const override + { + return memcmp(a_ptr, b_ptr, pack_length()); + } + void set_max() override; + bool is_max() override; + my_time_t get_timestamp(const uchar *pos, ulong *sec_part) const override; + bool val_native(Native *to) override; + uint size_of() const override { return sizeof *this; } + Binlog_type_info binlog_type_info() const override; +}; + + +class Field_year final :public Field_tiny { +public: + Field_year(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg) + :Field_tiny(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, 1, 1) + {} + const Type_handler *type_handler() const override + { + return field_length == 2 ? &type_handler_year2 : &type_handler_year; + } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + Copy_func *get_copy_func(const Field *from) const override + { + if (eq_def(from)) + return get_identical_copy_func(); + switch (from->cmp_type()) { + case STRING_RESULT: + { + const Type_handler *handler= from->type_handler(); + if (handler == &type_handler_enum || handler == &type_handler_set) + return do_field_int; + return do_field_string; + } + case TIME_RESULT: + return do_field_date; + case DECIMAL_RESULT: + return do_field_decimal; + case REAL_RESULT: + return do_field_real; + case INT_RESULT: + break; + case ROW_RESULT: + default: + DBUG_ASSERT(0); + break; + } + return do_field_int; + } + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int store_time_dec(const MYSQL_TIME *ltime, uint dec) override; + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override; + bool send(Protocol *protocol) override; + Information_schema_numeric_attributes + information_schema_numeric_attributes() const override + { + return Information_schema_numeric_attributes(); + } + uint32 max_display_length() const override { return field_length; } + void sql_type(String &str) const override; +}; + + +class Field_date_common :public Field_temporal_with_date +{ +protected: + int store_TIME_with_warning(const Datetime *ltime, const ErrConv *str, + int was_cut); +public: + Field_date_common(uchar *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg) + :Field_temporal_with_date(ptr_arg, MAX_DATE_WIDTH, + null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg) + {} + Copy_func *get_copy_func(const Field *from) const override; + SEL_ARG *get_mm_leaf(RANGE_OPT_PARAM *param, KEY_PART *key_part, + const Item_bool_func *cond, + scalar_comparison_op op, Item *value) override; + int store(const char *to, size_t length, CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int store_time_dec(const MYSQL_TIME *ltime, uint dec) override; + int store_decimal(const my_decimal *) override; +}; + + +class Field_date final :public Field_date_common +{ + void store_TIME(const MYSQL_TIME *ltime) override; + bool get_TIME(MYSQL_TIME *ltime, const uchar *pos, date_mode_t fuzzydate) + const override; +public: + Field_date(uchar *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg) + :Field_date_common(ptr_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg) {} + const Type_handler *type_handler() const override + { return &type_handler_date; } + enum ha_base_keytype key_type() const override + { return HA_KEYTYPE_ULONG_INT; } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + int reset() override { ptr[0]=ptr[1]=ptr[2]=ptr[3]=0; return 0; } + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override + { return Field_date::get_TIME(ltime, ptr, fuzzydate); } + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + bool send(Protocol *protocol) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override { return 4; } + void sql_type(String &str) const override; + uchar *pack(uchar* to, const uchar *from, uint) override + { + return pack_int32(to, from); + } + const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end, + uint) override + { + return unpack_int32(to, from, from_end); + } + uint size_of() const override { return sizeof *this; } +}; + + +class Field_newdate final :public Field_date_common +{ + void store_TIME(const MYSQL_TIME *ltime) override; + bool get_TIME(MYSQL_TIME *ltime, const uchar *pos, date_mode_t fuzzydate) + const override; +public: + Field_newdate(uchar *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg) + :Field_date_common(ptr_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg) + {} + const Type_handler *type_handler() const override + { return &type_handler_newdate; } + enum ha_base_keytype key_type() const override { return HA_KEYTYPE_UINT24; } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + int reset() override { ptr[0]=ptr[1]=ptr[2]=0; return 0; } + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + bool send(Protocol *protocol) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override { return 3; } + void sql_type(String &str) const override; + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override + { return Field_newdate::get_TIME(ltime, ptr, fuzzydate); } + longlong val_datetime_packed(THD *thd) override; + uint size_of() const override { return sizeof *this; } + Item *get_equal_const_item(THD *thd, const Context &ctx, Item *const_item) + override; +}; + + +class Field_time :public Field_temporal { + /* + when this Field_time instance is used for storing values for index lookups + (see class store_key, Field::new_key_field(), etc), the following + might be set to TO_DAYS(CURDATE()). See also Field_time::store_time_dec() + */ + long curdays; +protected: + virtual void store_TIME(const MYSQL_TIME *ltime)= 0; + void store_TIME(const Time &t) { return store_TIME(t.get_mysql_time()); } + int store_TIME_with_warning(const Time *ltime, const ErrConv *str, int warn); + bool check_zero_in_date_with_warn(date_mode_t fuzzydate); + static void do_field_time(Copy_field *copy); +public: + Field_time(uchar *ptr_arg, uint length_arg, uchar *null_ptr_arg, + uchar null_bit_arg, enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg) + :Field_temporal(ptr_arg, length_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg), curdays(0) + {} + bool can_be_substituted_to_equal_item(const Context &ctx, + const Item_equal *item_equal) override; + const Type_handler *type_handler() const override + { return &type_handler_time; } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + Copy_func *get_copy_func(const Field *from) const override + { + return from->cmp_type() == REAL_RESULT ? do_field_string : // MDEV-9344 + from->type() == MYSQL_TYPE_YEAR ? do_field_int : + from->type() == MYSQL_TYPE_BIT ? do_field_int : + eq_def(from) ? get_identical_copy_func() : + do_field_time; + } + bool memcpy_field_possible(const Field *from) const override + { + return real_type() == from->real_type() && + decimals() == from->decimals(); + } + sql_mode_t conversion_depends_on_sql_mode(THD *, Item *) const override; + int store_native(const Native &value) override; + bool val_native(Native *to) override; + int store_time_dec(const MYSQL_TIME *ltime, uint dec) override; + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int store_decimal(const my_decimal *) override; + String *val_str(String *, String *) override; + bool send(Protocol *protocol) override; + void set_curdays(THD *thd); + Field *new_key_field(MEM_ROOT *root, TABLE *new_table, + uchar *new_ptr, uint32 length, + uchar *new_null_ptr, uint new_null_bit) override; + Item *get_equal_const_item(THD *thd, const Context &ctx, Item *const_item) + override; +}; + + +class Field_time0 final :public Field_time +{ +protected: + void store_TIME(const MYSQL_TIME *ltime) override; +public: + Field_time0(uchar *ptr_arg, uint length_arg, uchar *null_ptr_arg, + uchar null_bit_arg, enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg) + :Field_time(ptr_arg, length_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg) + { } + enum ha_base_keytype key_type() const override { return HA_KEYTYPE_INT24; } + void sql_type(String &str) const override + { + sql_type_comment(str, Field_time0::type_handler()->name(), + Type_handler::version_mariadb53()); + } + double val_real() override; + longlong val_int() override; + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override { return 3; } + uint size_of() const override { return sizeof *this; } +}; + + +/** + Abstract class for: + - TIME(1..6) + - TIME(0..6) - MySQL56 version +*/ +class Field_time_with_dec :public Field_time { +protected: + uint dec; +public: + Field_time_with_dec(uchar *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + uint dec_arg) + :Field_time(ptr_arg, MIN_TIME_WIDTH + dec_arg + MY_TEST(dec_arg), + null_ptr_arg, null_bit_arg, unireg_check_arg, field_name_arg), + dec(dec_arg) + { + DBUG_ASSERT(dec <= TIME_SECOND_PART_DIGITS); + } + uint decimals() const override { return dec; } + enum ha_base_keytype key_type() const override { return HA_KEYTYPE_BINARY; } + longlong val_int() override; + double val_real() override; + void make_send_field(Send_field *) override; +}; + + +/** + TIME(1..6) +*/ +class Field_time_hires final :public Field_time_with_dec { + longlong zero_point; + void store_TIME(const MYSQL_TIME *) override; +public: + Field_time_hires(uchar *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + uint dec_arg) + :Field_time_with_dec(ptr_arg, null_ptr_arg, + null_bit_arg, unireg_check_arg, field_name_arg, + dec_arg) + { + DBUG_ASSERT(dec); + zero_point= sec_part_shift( + ((TIME_MAX_VALUE_SECONDS+1LL)*TIME_SECOND_PART_FACTOR), dec); + } + void sql_type(String &str) const override + { + sql_type_dec_comment(str, Field_time_hires::type_handler()->name(), + dec, Type_handler::version_mariadb53()); + } + int reset() override; + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override + { return Type_handler_time::hires_bytes(dec); } + uint size_of() const override { return sizeof *this; } +}; + + +/** + TIME(0..6) - MySQL56 version +*/ +class Field_timef final :public Field_time_with_dec { + void store_TIME(const MYSQL_TIME *ltime) override; +public: + Field_timef(uchar *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + uint dec_arg) + :Field_time_with_dec(ptr_arg, null_ptr_arg, + null_bit_arg, unireg_check_arg, field_name_arg, + dec_arg) + { + DBUG_ASSERT(dec <= TIME_SECOND_PART_DIGITS); + } + const Type_handler *type_handler() const override + { return &type_handler_time2; } + enum_field_types binlog_type() const override { return MYSQL_TYPE_TIME2; } + void sql_type(String &str) const override + { + sql_type_opt_dec_comment(str, Field_timef::type_handler()->name(), + dec, type_version_mysql56()); + } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + uint32 pack_length() const override + { + return my_time_binary_length(dec); + } + uint row_pack_length() const override { return pack_length(); } + uint pack_length_from_metadata(uint field_metadata) const override + { + DBUG_ENTER("Field_timef::pack_length_from_metadata"); + uint tmp= my_time_binary_length(field_metadata); + DBUG_RETURN(tmp); + } + void sort_string(uchar *to, uint length) override + { + DBUG_ASSERT(length == Field_timef::pack_length()); + memcpy(to, ptr, length); + } + int cmp(const uchar *a_ptr, const uchar *b_ptr) const override + { + return memcmp(a_ptr, b_ptr, pack_length()); + } + int reset() override; + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override; + longlong val_time_packed(THD *thd) override; + int store_native(const Native &value) override; + bool val_native(Native *to) override; + uint size_of() const override { return sizeof *this; } + Binlog_type_info binlog_type_info() const override; +}; + + +class Field_datetime :public Field_temporal_with_date { +protected: + int store_TIME_with_warning(const Datetime *ltime, const ErrConv *str, + int was_cut); +public: + Field_datetime(uchar *ptr_arg, uint length_arg, uchar *null_ptr_arg, + uchar null_bit_arg, enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg) + :Field_temporal_with_date(ptr_arg, length_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg) + { + if (unireg_check == TIMESTAMP_UN_FIELD || + unireg_check == TIMESTAMP_DNUN_FIELD) + flags|= ON_UPDATE_NOW_FLAG; + } + const Type_handler *type_handler() const override + { return &type_handler_datetime; } + sql_mode_t conversion_depends_on_sql_mode(THD *, Item *) const override; + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + int store(const char *to, size_t length, CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int store_time_dec(const MYSQL_TIME *ltime, uint dec) override; + int store_decimal(const my_decimal *) override; + int set_time() override; + Item *get_equal_const_item(THD *thd, const Context &ctx, Item *const_item) + override + { + return get_equal_const_item_datetime(thd, ctx, const_item); + } +}; + + +/* + Stored as a 8 byte unsigned int. Should sometimes be change to a 6 byte +*/ + +class Field_datetime0 final :public Field_datetime +{ + void store_TIME(const MYSQL_TIME *ltime) override; + bool get_TIME(MYSQL_TIME *ltime, const uchar *pos, date_mode_t fuzzydate) + const override; +public: + Field_datetime0(uchar *ptr_arg, uint length_arg, uchar *null_ptr_arg, + uchar null_bit_arg, enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg) + :Field_datetime(ptr_arg, length_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg) + {} + enum ha_base_keytype key_type() const override + { return HA_KEYTYPE_ULONGLONG; } + void sql_type(String &str) const override + { + sql_type_comment(str, Field_datetime0::type_handler()->name(), + Type_handler::version_mariadb53()); + } + double val_real() override + { + return (double) Field_datetime0::val_int(); + } + longlong val_int() override; + String *val_str(String *, String *) override; + bool send(Protocol *protocol) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override { return 8; } + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override + { return Field_datetime0::get_TIME(ltime, ptr, fuzzydate); } + uchar *pack(uchar* to, const uchar *from, uint) override + { + return pack_int64(to, from); + } + const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end, + uint) override + { + return unpack_int64(to, from, from_end); + } + uint size_of() const override { return sizeof *this; } +}; + + +/** + Abstract class for: + - DATETIME(1..6) + - DATETIME(0..6) - MySQL56 version +*/ +class Field_datetime_with_dec :public Field_datetime { +protected: + uint dec; +public: + Field_datetime_with_dec(uchar *ptr_arg, uchar *null_ptr_arg, + uchar null_bit_arg, enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, uint dec_arg) + :Field_datetime(ptr_arg, MAX_DATETIME_WIDTH + dec_arg + MY_TEST(dec_arg), + null_ptr_arg, null_bit_arg, unireg_check_arg, + field_name_arg), dec(dec_arg) + { + DBUG_ASSERT(dec <= TIME_SECOND_PART_DIGITS); + } + uint decimals() const override final { return dec; } + enum ha_base_keytype key_type() const override final { return HA_KEYTYPE_BINARY; } + void make_send_field(Send_field *field) override final; + bool send(Protocol *protocol) override final; + uchar *pack(uchar *to, const uchar *from, uint max_length) override final + { return Field::pack(to, from, max_length); } + const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end, + uint param_data) override final + { return Field::unpack(to, from, from_end, param_data); } + void sort_string(uchar *to, uint length) override final + { + DBUG_ASSERT(length == pack_length()); + memcpy(to, ptr, length); + } + double val_real() override final; + longlong val_int() override final; + String *val_str(String *, String *) override final; +}; + + +/** + DATETIME(1..6) +*/ +class Field_datetime_hires final :public Field_datetime_with_dec { + void store_TIME(const MYSQL_TIME *ltime) override; + bool get_TIME(MYSQL_TIME *ltime, const uchar *pos, date_mode_t fuzzydate) + const override; +public: + Field_datetime_hires(uchar *ptr_arg, uchar *null_ptr_arg, + uchar null_bit_arg, enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, uint dec_arg) + :Field_datetime_with_dec(ptr_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, dec_arg) + { + DBUG_ASSERT(dec); + } + void sql_type(String &str) const override + { + sql_type_dec_comment(str, Field_datetime_hires::type_handler()->name(), + dec, Type_handler::version_mariadb53()); + } + int cmp(const uchar *,const uchar *) const override; + uint32 pack_length() const override + { return Type_handler_datetime::hires_bytes(dec); } + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override + { return Field_datetime_hires::get_TIME(ltime, ptr, fuzzydate); } + uint size_of() const override { return sizeof *this; } +}; + + +/** + DATETIME(0..6) - MySQL56 version +*/ + +class Field_datetimef final :public Field_datetime_with_dec { + void store_TIME(const MYSQL_TIME *ltime) override; + bool get_TIME(MYSQL_TIME *ltime, const uchar *pos, date_mode_t fuzzydate) + const override; +public: + Field_datetimef(uchar *ptr_arg, uchar *null_ptr_arg, + uchar null_bit_arg, enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, uint dec_arg) + :Field_datetime_with_dec(ptr_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, dec_arg) + {} + const Type_handler *type_handler() const override + { return &type_handler_datetime2; } + enum_field_types binlog_type() const override + { return MYSQL_TYPE_DATETIME2; } + void sql_type(String &str) const override + { + sql_type_opt_dec_comment(str, Field_datetimef::type_handler()->name(), + dec, type_version_mysql56()); + } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + uint32 pack_length() const override + { + return my_datetime_binary_length(dec); + } + uint row_pack_length() const override { return pack_length(); } + uint pack_length_from_metadata(uint field_metadata) const override + { + DBUG_ENTER("Field_datetimef::pack_length_from_metadata"); + uint tmp= my_datetime_binary_length(field_metadata); + DBUG_RETURN(tmp); + } + int cmp(const uchar *a_ptr, const uchar *b_ptr) const override + { + return memcmp(a_ptr, b_ptr, pack_length()); + } + int reset() override; + bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override + { return Field_datetimef::get_TIME(ltime, ptr, fuzzydate); } + longlong val_datetime_packed(THD *thd) override; + uint size_of() const override { return sizeof *this; } + Binlog_type_info binlog_type_info() const override; +}; + + +static inline Field_timestamp * +new_Field_timestamp(MEM_ROOT *root,uchar *ptr, uchar *null_ptr, uchar null_bit, + enum Field::utype unireg_check, + const LEX_CSTRING *field_name, + TABLE_SHARE *share, uint dec) +{ + if (dec==0) + return new (root) + Field_timestamp0(ptr, MAX_DATETIME_WIDTH, null_ptr, + null_bit, unireg_check, field_name, share); + if (dec >= FLOATING_POINT_DECIMALS) + dec= MAX_DATETIME_PRECISION; + return new (root) + Field_timestamp_hires(ptr, null_ptr, null_bit, unireg_check, + field_name, share, dec); +} + +static inline Field_time * +new_Field_time(MEM_ROOT *root, uchar *ptr, uchar *null_ptr, uchar null_bit, + enum Field::utype unireg_check, const LEX_CSTRING *field_name, + uint dec) +{ + if (dec == 0) + return new (root) + Field_time0(ptr, MIN_TIME_WIDTH, null_ptr, null_bit, unireg_check, + field_name); + if (dec >= FLOATING_POINT_DECIMALS) + dec= MAX_DATETIME_PRECISION; + return new (root) + Field_time_hires(ptr, null_ptr, null_bit, unireg_check, field_name, dec); +} + +static inline Field_datetime * +new_Field_datetime(MEM_ROOT *root, uchar *ptr, uchar *null_ptr, uchar null_bit, + enum Field::utype unireg_check, + const LEX_CSTRING *field_name, uint dec) +{ + if (dec == 0) + return new (root) + Field_datetime0(ptr, MAX_DATETIME_WIDTH, null_ptr, null_bit, + unireg_check, field_name); + if (dec >= FLOATING_POINT_DECIMALS) + dec= MAX_DATETIME_PRECISION; + return new (root) + Field_datetime_hires(ptr, null_ptr, null_bit, + unireg_check, field_name, dec); +} + +class Field_string final :public Field_longstr { + class Warn_filter_string: public Warn_filter + { + public: + Warn_filter_string(const THD *thd, const Field_string *field); + }; + bool is_var_string() const + { + return can_alter_field_type && + orig_table && + (orig_table->s->db_create_options & HA_OPTION_PACK_RECORD) && + field_length >= 4 && + orig_table->s->frm_version < FRM_VER_TRUE_VARCHAR; + } +public: + bool can_alter_field_type; + Field_string(uchar *ptr_arg, uint32 len_arg,uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + const DTCollation &collation) + :Field_longstr(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, collation), + can_alter_field_type(1) {}; + Field_string(uint32 len_arg,bool maybe_null_arg, + const LEX_CSTRING *field_name_arg, + const DTCollation &collation) + :Field_longstr((uchar*) 0, len_arg, maybe_null_arg ? (uchar*) "": 0, 0, + NONE, field_name_arg, collation), + can_alter_field_type(1) {}; + + const Type_handler *type_handler() const override + { + if (is_var_string()) + return &type_handler_var_string; + return &type_handler_string; + } + enum ha_base_keytype key_type() const override + { return binary() ? HA_KEYTYPE_BINARY : HA_KEYTYPE_TEXT; } + en_fieldtype tmp_engine_column_type(bool use_packed_rows) const override; + bool zero_pack() const override { return false; } + Copy_func *get_copy_func(const Field *from) const override; + int reset() override + { + charset()->fill((char*) ptr, field_length, (has_charset() ? ' ' : 0)); + return 0; + } + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + using Field_str::store; + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + my_decimal *val_decimal(my_decimal *) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + void update_data_type_statistics(Data_type_statistics *st) const override + { + st->m_fixed_string_count++; + st->m_fixed_string_total_length+= pack_length(); + } + void sql_type(String &str) const override; + void sql_rpl_type(String*) const override; + bool is_equal(const Column_definition &new_field) const override; + bool can_be_converted_by_engine(const Column_definition &new_type) const + override + { + return table->file->can_convert_string(this, new_type); + } + uchar *pack(uchar *to, const uchar *from, uint max_length) override; + const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end, + uint param_data) override; + uint pack_length_from_metadata(uint field_metadata) const override + { + DBUG_PRINT("debug", ("field_metadata: 0x%04x", field_metadata)); + if (field_metadata == 0) + return row_pack_length(); + return (((field_metadata >> 4) & 0x300) ^ 0x300) + (field_metadata & 0x00ff); + } + bool compatible_field_size(uint field_metadata, const Relay_log_info *rli, + uint16 mflags, int *order_var) const override; + uint row_pack_length() const override { return field_length; } + int pack_cmp(const uchar *a,const uchar *b,uint key_length, + bool insert_or_update); + int pack_cmp(const uchar *b,uint key_length,bool insert_or_update); + uint packed_col_length(const uchar *to, uint length) override; + uint max_packed_col_length(uint max_length) override; + uint size_of() const override { return sizeof *this; } + bool has_charset() const override { return charset() != &my_charset_bin; } + Field *make_new_field(MEM_ROOT *root, TABLE *new_table, bool keep_type) + override; + uint get_key_image(uchar *buff, uint length, + const uchar *ptr_arg, imagetype type) const override; + sql_mode_t value_depends_on_sql_mode() const override; + sql_mode_t can_handle_sql_mode_dependency_on_store() const override; + void print_key_value(String *out, uint32 length) override; + Binlog_type_info binlog_type_info() const override; +}; + + +class Field_varstring :public Field_longstr { +public: + const uchar *get_data() const + { + return get_data(ptr); + } + const uchar *get_data(const uchar *ptr_arg) const + { + return ptr_arg + length_bytes; + } + uint get_length() const + { + return get_length(ptr); + } + uint get_length(const uchar *ptr_arg) const + { + return length_bytes == 1 ? (uint) *ptr_arg : uint2korr(ptr_arg); + } +protected: + void store_length(uint32 number) + { + if (length_bytes == 1) + *ptr= (uchar) number; + else + int2store(ptr, number); + } + virtual void val_str_from_ptr(String *val, const uchar *ptr) const; +public: + /* + The maximum space available in a Field_varstring, in bytes. See + length_bytes. + */ + static const uint MAX_SIZE; + /* Store number of bytes used to store length (1 or 2) */ + uint32 length_bytes; + Field_varstring(uchar *ptr_arg, + uint32 len_arg, uint length_bytes_arg, + uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + TABLE_SHARE *share, const DTCollation &collation) + :Field_longstr(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, collation), + length_bytes(length_bytes_arg) + { + share->varchar_fields++; + } + Field_varstring(uint32 len_arg,bool maybe_null_arg, + const LEX_CSTRING *field_name_arg, + TABLE_SHARE *share, const DTCollation &collation) + :Field_longstr((uchar*) 0,len_arg, maybe_null_arg ? (uchar*) "": 0, 0, + NONE, field_name_arg, collation), + length_bytes(len_arg < 256 ? 1 :2) + { + share->varchar_fields++; + } + + const Type_handler *type_handler() const override + { return &type_handler_varchar; } + en_fieldtype tmp_engine_column_type(bool use_packed_rows) const override + { + return FIELD_VARCHAR; + } + enum ha_base_keytype key_type() const override; + uint16 key_part_flag() const override { return HA_VAR_LENGTH_PART; } + uint16 key_part_length_bytes() const override { return HA_KEY_BLOB_LENGTH; } + uint row_pack_length() const override { return field_length; } + bool zero_pack() const override { return false; } + int reset() override { bzero(ptr,field_length+length_bytes); return 0; } + uint32 pack_length() const override + { return (uint32) field_length+length_bytes; } + uint32 key_length() const override { return (uint32) field_length; } + uint32 sort_length() const override + { + return (uint32) field_length + sort_suffix_length(); + } + virtual uint32 sort_suffix_length() const override + { + return (field_charset() == &my_charset_bin ? length_bytes : 0); + } + Copy_func *get_copy_func(const Field *from) const override; + bool memcpy_field_possible(const Field *from) const override; + void update_data_type_statistics(Data_type_statistics *st) const override + { + st->m_variable_string_count++; + st->m_variable_string_total_length+= pack_length(); + } + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + using Field_str::store; +#ifdef HAVE_MEM_CHECK + void mark_unused_memory_as_defined() override; +#endif + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + my_decimal *val_decimal(my_decimal *) override; + bool send(Protocol *protocol) override; + int cmp(const uchar *a,const uchar *b) const override; + int cmp_prefix(const uchar *a, const uchar *b, size_t prefix_len) const + override; + void sort_string(uchar *buff,uint length) override; + uint get_key_image(uchar *buff, uint length, + const uchar *ptr_arg, imagetype type) const override; + void set_key_image(const uchar *buff,uint length) override; + void sql_type(String &str) const override; + void sql_rpl_type(String*) const override; + uchar *pack(uchar *to, const uchar *from, uint max_length) override; + const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end, + uint param_data) override; + int cmp_binary(const uchar *a,const uchar *b, uint32 max_length=~0U) const + override; + int key_cmp(const uchar *,const uchar*) const override; + int key_cmp(const uchar *str, uint length) const override; + uint packed_col_length(const uchar *to, uint length) override; + uint max_packed_col_length(uint max_length) override; + uint32 data_length() override; + uint size_of() const override { return sizeof *this; } + bool has_charset() const override + { return charset() == &my_charset_bin ? FALSE : TRUE; } + Field *make_new_field(MEM_ROOT *root, TABLE *new_table, bool keep_type) + override; + Field *new_key_field(MEM_ROOT *root, TABLE *new_table, + uchar *new_ptr, uint32 length, + uchar *new_null_ptr, uint new_null_bit) override; + bool is_equal(const Column_definition &new_field) const override; + bool can_be_converted_by_engine(const Column_definition &new_type) const + override + { + return table->file->can_convert_varstring(this, new_type); + } + void hash(ulong *nr, ulong *nr2) override; + uint length_size() const override { return length_bytes; } + void print_key_value(String *out, uint32 length) override; + Binlog_type_info binlog_type_info() const override; +}; + + +class Field_varstring_compressed final :public Field_varstring { +public: + Field_varstring_compressed(uchar *ptr_arg, + uint32 len_arg, uint length_bytes_arg, + uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, + TABLE_SHARE *share, const DTCollation &collation, + Compression_method *compression_method_arg): + Field_varstring(ptr_arg, len_arg, length_bytes_arg, null_ptr_arg, + null_bit_arg, unireg_check_arg, field_name_arg, + share, collation), + compression_method_ptr(compression_method_arg) { DBUG_ASSERT(len_arg > 0); } + Compression_method *compression_method() const override + { return compression_method_ptr; } +private: + Compression_method *compression_method_ptr; + void val_str_from_ptr(String *val, const uchar *ptr) const override; + int store(const char *to, size_t length, CHARSET_INFO *charset) override; + using Field_str::store; + String *val_str(String *, String *) override; + double val_real() override; + longlong val_int() override; + uint size_of() const override { return sizeof *this; } + /* + We use the default Field::send() implementation, + because the derived optimized version (from Field_longstr) + is not suitable for compressed fields. + */ + bool send(Protocol *protocol) override + { + return Field::send(protocol); + } + enum_field_types binlog_type() const override + { return MYSQL_TYPE_VARCHAR_COMPRESSED; } + void sql_type(String &str) const override + { + Field_varstring::sql_type(str); + str.append(STRING_WITH_LEN(" /*!100301 COMPRESSED*/")); + } + uint32 max_display_length() const override { return field_length - 1; } + uint32 character_octet_length() const override { return field_length - 1; } + uint32 char_length() const override + { + return (field_length - 1) / mbmaxlen(); + } + int cmp(const uchar *a_ptr, const uchar *b_ptr) const override; + + /* + Compressed fields can't have keys as two rows may have different + compression methods or compression levels. + */ + + int key_cmp(const uchar *str, uint length) const override + { DBUG_ASSERT(0); return 0; } + using Field_varstring::key_cmp; + Binlog_type_info binlog_type_info() const override; +}; + + +static inline uint8 number_storage_requirement(uint32 n) +{ + return n < 256 ? 1 : n < 65536 ? 2 : n < 16777216 ? 3 : 4; +} + + +static inline void store_bigendian(ulonglong num, uchar *to, uint bytes) +{ + switch(bytes) { + case 1: mi_int1store(to, num); break; + case 2: mi_int2store(to, num); break; + case 3: mi_int3store(to, num); break; + case 4: mi_int4store(to, num); break; + case 5: mi_int5store(to, num); break; + case 6: mi_int6store(to, num); break; + case 7: mi_int7store(to, num); break; + case 8: mi_int8store(to, num); break; + default: DBUG_ASSERT(0); + } +} + + +static inline longlong read_bigendian(const uchar *from, uint bytes) +{ + switch(bytes) { + case 1: return mi_uint1korr(from); + case 2: return mi_uint2korr(from); + case 3: return mi_uint3korr(from); + case 4: return mi_uint4korr(from); + case 5: return mi_uint5korr(from); + case 6: return mi_uint6korr(from); + case 7: return mi_uint7korr(from); + case 8: return mi_sint8korr(from); + default: DBUG_ASSERT(0); return 0; + } +} + +static inline void store_lowendian(ulonglong num, uchar *to, uint bytes) +{ + switch(bytes) { + case 1: *to= (uchar)num; break; + case 2: int2store(to, num); break; + case 3: int3store(to, num); break; + case 4: int4store(to, num); break; + case 8: int8store(to, num); break; + default: DBUG_ASSERT(0); + } +} + +static inline longlong read_lowendian(const uchar *from, uint bytes) +{ + switch(bytes) { + case 1: return from[0]; + case 2: return uint2korr(from); + case 3: return uint3korr(from); + case 4: return uint4korr(from); + case 8: return sint8korr(from); + default: DBUG_ASSERT(0); return 0; + } +} + + +extern LEX_CSTRING temp_lex_str; + +class Field_blob :public Field_longstr { +protected: + /** + The number of bytes used to represent the length of the blob. + */ + uint packlength; + + /** + The 'value'-object is a cache fronting the storage engine. + */ + String value; + /** + Cache for blob values when reading a row with a virtual blob + field. This is needed to not destroy the old cached value when + updating the blob with a new value when creating the new row. + */ + String read_value; + + static void do_copy_blob(Copy_field *copy); + static void do_conv_blob(Copy_field *copy); + uint get_key_image_itRAW(const uchar *ptr_arg, uchar *buff, uint length) const; +public: + Field_blob(uchar *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + TABLE_SHARE *share, uint blob_pack_length, + const DTCollation &collation); + Field_blob(uint32 len_arg,bool maybe_null_arg, const LEX_CSTRING *field_name_arg, + const DTCollation &collation) + :Field_longstr((uchar*) 0, len_arg, maybe_null_arg ? (uchar*) "": 0, 0, + NONE, field_name_arg, collation), + packlength(4) + { + flags|= BLOB_FLAG; + } + Field_blob(uint32 len_arg,bool maybe_null_arg, + const LEX_CSTRING *field_name_arg, + const DTCollation &collation, bool set_packlength) + :Field_longstr((uchar*) 0,len_arg, maybe_null_arg ? (uchar*) "": 0, 0, + NONE, field_name_arg, collation) + { + flags|= BLOB_FLAG; + packlength= set_packlength ? number_storage_requirement(len_arg) : 4; + } + Field_blob(uint32 packlength_arg) + :Field_longstr((uchar*) 0, 0, (uchar*) "", 0, NONE, &temp_lex_str, + system_charset_info), + packlength(packlength_arg) {} + const Type_handler *type_handler() const override; + /* Note that the default copy constructor is used, in clone() */ + enum_field_types type() const override + { + /* + We cannot return type_handler()->field_type() here. + Some pieces of the code (e.g. in engines) rely on the fact + that Field::type(), Field::real_type() and Item_field::field_type() + return MYSQL_TYPE_BLOB for all blob variants. + We should eventually fix all such code pieces to expect + all BLOB type codes. + */ + return MYSQL_TYPE_BLOB; + } + enum_field_types real_type() const override + { + return MYSQL_TYPE_BLOB; + } + enum ha_base_keytype key_type() const override + { return binary() ? HA_KEYTYPE_VARBINARY2 : HA_KEYTYPE_VARTEXT2; } + uint16 key_part_flag() const override { return HA_BLOB_PART; } + uint16 key_part_length_bytes() const override { return HA_KEY_BLOB_LENGTH; } + en_fieldtype tmp_engine_column_type(bool use_packed_rows) const override + { + return FIELD_BLOB; + } + Type_numeric_attributes type_numeric_attributes() const override + { + return Type_numeric_attributes(Field_blob::max_display_length(), + decimals(), is_unsigned()); + } + Information_schema_character_attributes + information_schema_character_attributes() const override + { + uint32 octets= Field_blob::character_octet_length(); + uint32 chars= octets / field_charset()->mbminlen; + return Information_schema_character_attributes(octets, chars); + } + void update_data_type_statistics(Data_type_statistics *st) const override + { + st->m_blob_count++; + } + void make_send_field(Send_field *) override; + Copy_func *get_copy_func(const Field *from) const override + { + /* + TODO: MDEV-9331 + if (from->type() == MYSQL_TYPE_BIT) + return do_field_int; + */ + if (!(from->flags & BLOB_FLAG) || from->charset() != charset() || + !from->compression_method() != !compression_method()) + return do_conv_blob; + if (from->pack_length() != Field_blob::pack_length()) + return do_copy_blob; + return get_identical_copy_func(); + } + int store_field(Field *from) override + { // Be sure the value is stored + if (field_charset() == &my_charset_bin && + from->type_handler()->convert_to_binary_using_val_native()) + { + NativeBuffer<64> tmp; + from->val_native(&tmp); + value.copy(tmp.ptr(), tmp.length(), &my_charset_bin); + return store(value.ptr(), value.length(), &my_charset_bin); + } + from->val_str(&value); + if (table->copy_blobs || + (!value.is_alloced() && from->is_varchar_and_in_write_set())) + value.copy(); + return store(value.ptr(), value.length(), from->charset()); + } + bool memcpy_field_possible(const Field *from) const override + { + return Field_str::memcpy_field_possible(from) && + !compression_method() == !from->compression_method() && + !table->copy_blobs; + } + bool make_empty_rec_store_default_value(THD *thd, Item *item) override; + int store(const char *to, size_t length, CHARSET_INFO *charset) override; + using Field_str::store; + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + my_decimal *val_decimal(my_decimal *) override; + int cmp(const uchar *a, const uchar *b) const override; + int cmp_prefix(const uchar *a, const uchar *b, size_t prefix_len) const + override; + int cmp(const uchar *a, uint32 a_length, const uchar *b, uint32 b_length) + const; + int cmp_binary(const uchar *a,const uchar *b, uint32 max_length=~0U) const + override; + int key_cmp(const uchar *,const uchar*) const override; + int key_cmp(const uchar *str, uint length) const override; + /* Never update the value of min_val for a blob field */ + bool update_min(Field *min_val, bool force_update) override { return false; } + /* Never update the value of max_val for a blob field */ + bool update_max(Field *max_val, bool force_update) override { return false; } + uint32 key_length() const override { return 0; } + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override + { return (uint32) (packlength + portable_sizeof_char_ptr); } + + /** + Return the packed length without the pointer size added. + + This is used to determine the size of the actual data in the row + buffer. + + @returns The length of the raw data itself without the pointer. + */ + uint32 pack_length_no_ptr() const + { return (uint32) (packlength); } + uint row_pack_length() const override { return pack_length_no_ptr(); } + uint32 sort_length() const override; + uint32 sort_suffix_length() const override; + uint32 value_length() override { return get_length(); } + virtual uint32 max_data_length() const override + { + return (uint32) (((ulonglong) 1 << (packlength*8)) -1); + } + int reset() override { bzero(ptr, packlength+sizeof(uchar*)); return 0; } + void reset_fields() override + { + bzero((uchar*) &value, sizeof value); + bzero((uchar*) &read_value, sizeof read_value); + } + uint32 get_field_buffer_size() { return value.alloced_length(); } + void store_length(uchar *i_ptr, uint i_packlength, uint32 i_number); + void store_length(size_t number) + { + DBUG_ASSERT(number < UINT_MAX32); + store_length(ptr, packlength, (uint32)number); + } + inline uint32 get_length(my_ptrdiff_t row_offset= 0) const + { return get_length(ptr+row_offset, this->packlength); } + uint32 get_length(const uchar *ptr, uint packlength) const; + uint32 get_length(const uchar *ptr_arg) const + { return get_length(ptr_arg, this->packlength); } + inline uchar *get_ptr() const { return get_ptr(ptr); } + inline uchar *get_ptr(const uchar *ptr_arg) const + { + uchar *s; + memcpy(&s, ptr_arg + packlength, sizeof(uchar*)); + return s; + } + inline void set_ptr(uchar *length, uchar *data) + { + memcpy(ptr,length,packlength); + memcpy(ptr+packlength, &data,sizeof(char*)); + } + void set_ptr_offset(my_ptrdiff_t ptr_diff, uint32 length, const uchar *data) + { + uchar *ptr_ofs= ADD_TO_PTR(ptr,ptr_diff,uchar*); + store_length(ptr_ofs, packlength, length); + memcpy(ptr_ofs+packlength, &data, sizeof(char*)); + } + inline void set_ptr(uint32 length, uchar *data) + { + set_ptr_offset(0, length, data); + } + int copy_value(Field_blob *from); + uint get_key_image(uchar *buff, uint length, + const uchar *ptr_arg, imagetype type) const override + { + DBUG_ASSERT(type == itRAW); + return get_key_image_itRAW(ptr_arg, buff, length); + } + void set_key_image(const uchar *buff,uint length) override; + Field *new_key_field(MEM_ROOT *root, TABLE *new_table, + uchar *new_ptr, uint32 length, + uchar *new_null_ptr, uint new_null_bit) override; + void sql_type(String &str) const override; + inline bool copy() + { + uchar *tmp= get_ptr(); + if (value.copy((char*) tmp, get_length(), charset())) + { + Field_blob::reset(); + return 1; + } + tmp=(uchar*) value.ptr(); + memcpy(ptr+packlength, &tmp, sizeof(char*)); + return 0; + } + /* store value for the duration of the current read record */ + inline void swap_value_and_read_value() + { + read_value.swap(value); + } + inline void set_value(uchar *data) + { + /* Set value pointer. Lengths are not important */ + value.reset((char*) data, 1, 1, &my_charset_bin); + } + uchar *pack(uchar *to, const uchar *from, uint max_length) override; + const uchar *unpack(uchar *to, const uchar *from, const uchar *from_end, + uint param_data) override; + uint packed_col_length(const uchar *col_ptr, uint length) override; + uint max_packed_col_length(uint max_length) override; + void free() override + { + value.free(); + read_value.free(); + } + inline void clear_temporary() + { + uchar *tmp= get_ptr(); + if (likely(value.ptr() == (char*) tmp)) + bzero((uchar*) &value, sizeof(value)); + else + { + /* + Currently read_value should never point to tmp, the following code + is mainly here to make things future proof. + */ + if (unlikely(read_value.ptr() == (char*) tmp)) + bzero((uchar*) &read_value, sizeof(read_value)); + } + } + uint size_of() const override { return sizeof *this; } + bool has_charset() const override { return charset() != &my_charset_bin; } + uint32 max_display_length() const override; + uint32 char_length() const override; + uint32 character_octet_length() const override; + bool is_equal(const Column_definition &new_field) const override; + bool can_be_converted_by_engine(const Column_definition &new_type) const + override + { + return table->file->can_convert_blob(this, new_type); + } + void print_key_value(String *out, uint32 length) override; + Binlog_type_info binlog_type_info() const override; + + friend void TABLE::remember_blob_values(String *blob_storage); + friend void TABLE::restore_blob_values(String *blob_storage); +}; + + +class Field_blob_compressed final :public Field_blob { +public: + Field_blob_compressed(uchar *ptr_arg, uchar *null_ptr_arg, + uchar null_bit_arg, enum utype unireg_check_arg, + const LEX_CSTRING *field_name_arg, TABLE_SHARE *share, + uint blob_pack_length, const DTCollation &collation, + Compression_method *compression_method_arg): + Field_blob(ptr_arg, null_ptr_arg, null_bit_arg, unireg_check_arg, + field_name_arg, share, blob_pack_length, collation), + compression_method_ptr(compression_method_arg) {} + Compression_method *compression_method() const override + { return compression_method_ptr; } +private: + Compression_method *compression_method_ptr; + int store(const char *to, size_t length, CHARSET_INFO *charset) override; + using Field_str::store; + String *val_str(String *, String *) override; + double val_real() override; + longlong val_int() override; + /* + We use the default Field::send() implementation, + because the derived optimized version (from Field_longstr) + is not suitable for compressed fields. + */ + bool send(Protocol *protocol) override + { + return Field::send(protocol); + } + uint size_of() const override { return sizeof *this; } + enum_field_types binlog_type() const override + { return MYSQL_TYPE_BLOB_COMPRESSED; } + void sql_type(String &str) const override + { + Field_blob::sql_type(str); + str.append(STRING_WITH_LEN(" /*!100301 COMPRESSED*/")); + } + + /* + Compressed fields can't have keys as two rows may have different + compression methods or compression levels. + */ + + uint get_key_image(uchar *buff, uint length, + const uchar *ptr_arg, imagetype type_arg) const override + { DBUG_ASSERT(0); return 0; } + void set_key_image(const uchar *, uint) override + { DBUG_ASSERT(0); } + int key_cmp(const uchar *, const uchar *) const override + { DBUG_ASSERT(0); return 0; } + int key_cmp(const uchar *, uint) const override + { DBUG_ASSERT(0); return 0; } + Field *new_key_field(MEM_ROOT *, TABLE *, uchar *, uint32, uchar *, uint) + override + { DBUG_ASSERT(0); return 0; } + Binlog_type_info binlog_type_info() const override; +}; + + +class Field_enum :public Field_str { + static void do_field_enum(Copy_field *copy_field); + longlong val_int(const uchar *) const; +protected: + uint packlength; +public: + const TYPELIB *typelib; + Field_enum(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + uint packlength_arg, + const TYPELIB *typelib_arg, + const DTCollation &collation) + :Field_str(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, collation), + packlength(packlength_arg),typelib(typelib_arg) + { + flags|=ENUM_FLAG; + } + Field *make_new_field(MEM_ROOT *root, TABLE *new_table, bool keep_type) + override; + const Type_handler *type_handler() const override + { return &type_handler_enum; } + enum ha_base_keytype key_type() const override; + sql_mode_t can_handle_sql_mode_dependency_on_store() const override; + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + Copy_func *get_copy_func(const Field *from) const override + { + if (eq_def(from)) + return get_identical_copy_func(); + if (real_type() == MYSQL_TYPE_ENUM && + from->real_type() == MYSQL_TYPE_ENUM) + return do_field_enum; + if (from->result_type() == STRING_RESULT) + return do_field_string; + return do_field_int; + } + int store_field(Field *from) override + { + if (from->real_type() == MYSQL_TYPE_ENUM && from->val_int() == 0) + { + store_type(0); + return 0; + } + return from->save_in_field(this); + } + int save_in_field(Field *to) override + { + if (to->result_type() != STRING_RESULT) + return to->store(val_int(), 0); + return save_in_field_str(to); + } + bool memcpy_field_possible(const Field *from) const override + { return false; } + void make_empty_rec_reset(THD *) override + { + if (flags & NOT_NULL_FLAG) + { + set_notnull(); + store((longlong) 1, true); + } + else + reset(); + } + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + double val_real() override; + longlong val_int() override; + String *val_str(String *, String *) override; + int cmp(const uchar *,const uchar *) const override; + void sort_string(uchar *buff,uint length) override; + uint32 pack_length() const override { return (uint32) packlength; } + void store_type(ulonglong value); + void sql_type(String &str) const override; + uint size_of() const override { return sizeof *this; } + uint pack_length_from_metadata(uint field_metadata) const override + { return (field_metadata & 0x00ff); } + uint row_pack_length() const override { return pack_length(); } + bool zero_pack() const override { return false; } + bool optimize_range(uint, uint) const override { return false; } + bool eq_def(const Field *field) const override; + bool has_charset() const override { return true; } + /* enum and set are sorted as integers */ + CHARSET_INFO *sort_charset() const override { return &my_charset_bin; } + uint decimals() const override { return 0; } + const TYPELIB *get_typelib() const override { return typelib; } + + uchar *pack(uchar *to, const uchar *from, uint max_length) override; + const uchar *unpack(uchar *to, const uchar *from, const uchar *from_end, + uint param_data) override; + + bool can_optimize_keypart_ref(const Item_bool_func *cond, + const Item *item) const override; + bool can_optimize_group_min_max(const Item_bool_func *, const Item *) + const override + { + /* + Can't use GROUP_MIN_MAX optimization for ENUM and SET, + because the values are stored as numbers in index, + while MIN() and MAX() work as strings. + It would return the records with min and max enum numeric indexes. + "Bug#45300 MAX() and ENUM type" should be fixed first. + */ + return false; + } + bool can_optimize_range(const Item_bool_func *cond, + const Item *item, + bool is_eq_func) const override; + Binlog_type_info binlog_type_info() const override; +private: + bool is_equal(const Column_definition &new_field) const override; +}; + + +class Field_set final :public Field_enum { +public: + Field_set(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg, + uint32 packlength_arg, + const TYPELIB *typelib_arg, const DTCollation &collation) + :Field_enum(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, + unireg_check_arg, field_name_arg, + packlength_arg, + typelib_arg, collation), + empty_set_string("", 0, collation.collation) + { + flags=(flags & ~ENUM_FLAG) | SET_FLAG; + } + void make_empty_rec_reset(THD *thd) override + { + Field::make_empty_rec_reset(thd); + } + + int store_field(Field *from) override { return from->save_in_field(this); } + int store(const char *to,size_t length,CHARSET_INFO *charset) override; + int store(double nr) override + { return Field_set::store((longlong) nr, FALSE); } + int store(longlong nr, bool unsigned_val) override; + + bool zero_pack() const override { return true; } + String *val_str(String *, String *) override; + void sql_type(String &str) const override; + uint size_of() const override { return sizeof *this; } + const Type_handler *type_handler() const override + { return &type_handler_set; } + bool has_charset() const override { return true; } + Binlog_type_info binlog_type_info() const override; +private: + const String empty_set_string; +}; + + +/* + Note: + To use Field_bit::cmp_binary() you need to copy the bits stored in + the beginning of the record (the NULL bytes) to each memory you + want to compare (where the arguments point). + + This is the reason: + - Field_bit::cmp_binary() is only implemented in the base class + (Field::cmp_binary()). + - Field::cmp_binary() currently uses pack_length() to calculate how + long the data is. + - pack_length() includes size of the bits stored in the NULL bytes + of the record. +*/ +class Field_bit :public Field { +public: + uchar *bit_ptr; // position in record where 'uneven' bits store + uchar bit_ofs; // offset to 'uneven' high bits + uint bit_len; // number of 'uneven' high bits + uint bytes_in_rec; + Field_bit(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, uchar *bit_ptr_arg, uchar bit_ofs_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg); + const Type_handler *type_handler() const override + { return &type_handler_bit; } + enum ha_base_keytype key_type() const override { return HA_KEYTYPE_BIT; } + uint16 key_part_flag() const override { return HA_BIT_PART; } + uint32 key_length() const override + { return (uint32) (field_length + 7) / 8; } + uint32 max_data_length() const override { return key_length(); } + uint32 max_display_length() const override { return field_length; } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const override; + CHARSET_INFO *charset() const override { return &my_charset_bin; } + const DTCollation & dtcollation() const override; + Information_schema_numeric_attributes + information_schema_numeric_attributes() const override + { + return Information_schema_numeric_attributes(field_length); + } + void update_data_type_statistics(Data_type_statistics *st) const override + { + st->m_uneven_bit_length+= field_length & 7; + } + uint size_of() const override { return sizeof *this; } + int reset() override + { + bzero(ptr, bytes_in_rec); + if (bit_ptr && (bit_len > 0)) // reset odd bits among null bits + clr_rec_bits(bit_ptr, bit_ofs, bit_len); + return 0; + } + Copy_func *get_copy_func(const Field *from) const override + { + if (from->cmp_type() == DECIMAL_RESULT) + return do_field_decimal; + return do_field_int; + } + int save_in_field(Field *to) override { return to->store(val_int(), true); } + bool memcpy_field_possible(const Field *from) const override{ return false; } + int store(const char *to, size_t length, CHARSET_INFO *charset) override; + int store(double nr) override; + int store(longlong nr, bool unsigned_val) override; + int store_decimal(const my_decimal *) override; + double val_real() override; + longlong val_int() override; + String *val_str(String*, String *) override; + bool str_needs_quotes() const override { return true; } + my_decimal *val_decimal(my_decimal *) override; + bool val_bool() override { return val_int() != 0; } + int cmp(const uchar *a, const uchar *b) const override + { + DBUG_ASSERT(ptr == a || ptr == b); + if (ptr == a) + return Field_bit::key_cmp(b, bytes_in_rec + MY_TEST(bit_len)); + else + return Field_bit::key_cmp(a, bytes_in_rec + MY_TEST(bit_len)) * -1; + } + int cmp_binary_offset(uint row_offset) override + { return cmp_offset(row_offset); } + int cmp_prefix(const uchar *a, const uchar *b, + size_t max_length) const override; + int key_cmp(const uchar *a, const uchar *b) const override + { return cmp_binary((uchar *) a, (uchar *) b); } + int key_cmp(const uchar *str, uint length) const override; + int cmp_offset(my_ptrdiff_t row_offset) override; + bool update_min(Field *min_val, bool force_update) override + { + longlong val= val_int(); + bool update_fl= force_update || val < min_val->val_int(); + if (update_fl) + { + min_val->set_notnull(); + min_val->store(val, FALSE); + } + return update_fl; + } + bool update_max(Field *max_val, bool force_update) override + { + longlong val= val_int(); + bool update_fl= force_update || val > max_val->val_int(); + if (update_fl) + { + max_val->set_notnull(); + max_val->store(val, FALSE); + } + return update_fl; + } + void store_field_value(uchar *val, uint) override + { + store(*((longlong *)val), TRUE); + } + double pos_in_interval(Field *min, Field *max) override + { + return pos_in_interval_val_real(min, max); + } + void get_image(uchar *buff, uint length, + const uchar *ptr_arg, CHARSET_INFO *cs) const override + { get_key_image(buff, length, ptr_arg, itRAW); } + void set_image(const uchar *buff,uint length, CHARSET_INFO *cs) override + { Field_bit::store((char *) buff, length, cs); } + uint get_key_image(uchar *buff, uint length, + const uchar *ptr_arg, imagetype type) const override; + void set_key_image(const uchar *buff, uint length) override + { Field_bit::store((char*) buff, length, &my_charset_bin); } + void sort_string(uchar *buff, uint length) override + { get_key_image(buff, length, ptr, itRAW); } + uint32 pack_length() const override + { return (uint32) (field_length + 7) / 8; } + uint32 pack_length_in_rec() const override { return bytes_in_rec; } + uint pack_length_from_metadata(uint field_metadata) const override; + uint row_pack_length() const override + { return (bytes_in_rec + ((bit_len > 0) ? 1 : 0)); } + bool compatible_field_size(uint metadata, const Relay_log_info *rli, + uint16 mflags, int *order_var) const override; + void sql_type(String &str) const override; + uchar *pack(uchar *to, const uchar *from, uint max_length) override; + const uchar *unpack(uchar *to, const uchar *from, + const uchar *from_end, uint param_data) override; + int set_default() override; + + Field *new_key_field(MEM_ROOT *root, TABLE *new_table, + uchar *new_ptr, uint32 length, + uchar *new_null_ptr, uint new_null_bit) override; + void set_bit_ptr(uchar *bit_ptr_arg, uchar bit_ofs_arg) + { + bit_ptr= bit_ptr_arg; + bit_ofs= bit_ofs_arg; + } + bool eq(Field *field) override + { + return (Field::eq(field) && + bit_ptr == ((Field_bit *)field)->bit_ptr && + bit_ofs == ((Field_bit *)field)->bit_ofs); + } + bool is_equal(const Column_definition &new_field) const override; + void move_field_offset(my_ptrdiff_t ptr_diff) override + { + Field::move_field_offset(ptr_diff); + + /* + clang does not like when things are added to a null pointer, even if + it is never referenced. + */ + if (bit_ptr) + bit_ptr= ADD_TO_PTR(bit_ptr, ptr_diff, uchar*); + } + void hash(ulong *nr, ulong *nr2) override; + + SEL_ARG *get_mm_leaf(RANGE_OPT_PARAM *param, KEY_PART *key_part, + const Item_bool_func *cond, + scalar_comparison_op op, Item *value) override + { + return get_mm_leaf_int(param, key_part, cond, op, value, true); + } + void print_key_value(String *out, uint32 length) override + { + val_int_as_str(out, 1); + } + /** + Save the field metadata for bit fields. + Saves the bit length in the first byte and bytes in record in the + second byte of the field metadata array at index of *metadata_ptr and + *(metadata_ptr + 1). + + @param metadata_ptr First byte of field metadata + + @returns number of bytes written to metadata_ptr + */ + Binlog_type_info binlog_type_info() const override + { + DBUG_PRINT("debug", ("bit_len: %d, bytes_in_rec: %d", + bit_len, bytes_in_rec)); + /* + Since this class and Field_bit_as_char have different ideas of + what should be stored here, we compute the values of the metadata + explicitly using the field_length. + */ + return Binlog_type_info(type(), + static_cast<uint16>((field_length & 7) | + ((field_length / 8) << 8)), 2); + } + +private: + size_t do_last_null_byte() const override; +}; + + +/** + BIT field represented as chars for non-MyISAM tables. + + @todo The inheritance relationship is backwards since Field_bit is + an extended version of Field_bit_as_char and not the other way + around. Hence, we should refactor it to fix the hierarchy order. + */ +class Field_bit_as_char final :public Field_bit { +public: + Field_bit_as_char(uchar *ptr_arg, uint32 len_arg, uchar *null_ptr_arg, + uchar null_bit_arg, + enum utype unireg_check_arg, const LEX_CSTRING *field_name_arg); + enum ha_base_keytype key_type() const override { return HA_KEYTYPE_BINARY; } + uint size_of() const override { return sizeof *this; } + int store(const char *to, size_t length, CHARSET_INFO *charset) override; + int store(double nr) override { return Field_bit::store(nr); } + int store(longlong nr, bool unsigned_val) override + { return Field_bit::store(nr, unsigned_val); } + void sql_type(String &str) const override; +}; + + +class Field_row final :public Field_null +{ + class Virtual_tmp_table *m_table; +public: + Field_row(uchar *ptr_arg, const LEX_CSTRING *field_name_arg) + :Field_null(ptr_arg, 0, Field::NONE, field_name_arg, &my_charset_bin), + m_table(NULL) + {} + ~Field_row(); + en_fieldtype tmp_engine_column_type(bool use_packed_rows) const + { + DBUG_ASSERT(0); + return Field::tmp_engine_column_type(use_packed_rows); + } + enum_conv_type rpl_conv_type_from(const Conv_source &source, + const Relay_log_info *rli, + const Conv_param ¶m) const + { + DBUG_ASSERT(0); + return CONV_TYPE_IMPOSSIBLE; + } + Virtual_tmp_table **virtual_tmp_table_addr() { return &m_table; } + bool sp_prepare_and_store_item(THD *thd, Item **value); +}; + + +extern const LEX_CSTRING null_clex_str; + +class Column_definition_attributes +{ +public: + /* + At various stages in execution this can be length of field in bytes or + max number of characters. + */ + ulonglong length; + uint decimals; + Field::utype unireg_check; + const TYPELIB *interval; // Which interval to use + CHARSET_INFO *charset; + uint32 srid; + uint pack_flag; + Column_definition_attributes() + :length(0), + decimals(0), + unireg_check(Field::NONE), + interval(NULL), + charset(&my_charset_bin), + srid(0), + pack_flag(0) + { } + Column_definition_attributes(const Field *field); + Column_definition_attributes(const Type_all_attributes &attr); + Field *make_field(TABLE_SHARE *share, MEM_ROOT *mem_root, + const Record_addr *rec, + const Type_handler *handler, + const LEX_CSTRING *field_name, + uint32 flags) const; + uint temporal_dec(uint intlen) const + { + return (uint) (length > intlen ? length - intlen - 1 : 0); + } + uint pack_flag_to_pack_length() const; + void frm_pack_basic(uchar *buff) const; + void frm_pack_charset(uchar *buff) const; + void frm_pack_numeric_with_dec(uchar *buff) const; + void frm_unpack_basic(const uchar *buff); + bool frm_unpack_charset(TABLE_SHARE *share, const uchar *buff); + bool frm_unpack_numeric_with_dec(TABLE_SHARE *share, const uchar *buff); + bool frm_unpack_temporal_with_dec(TABLE_SHARE *share, uint intlen, + const uchar *buff); + void set_length_and_dec(const Lex_length_and_dec_st &attr); + CHARSET_INFO *explicit_or_derived_charset(const Column_derived_attributes + *derived_attr) const + { + return charset ? charset : derived_attr->charset(); + } +}; + + +/* + Create field class for CREATE TABLE +*/ +class Column_definition: public Sql_alloc, + public Type_handler_hybrid_field_type, + public Column_definition_attributes +{ + /** + Create "interval" from "interval_list". + @param mem_root - memory root to create the TYPELIB + instance and its values on + @param reuse_interval_list_values - determines if TYPELIB can reuse strings + from interval_list, or should always + allocate a copy on mem_root, even if + character set conversion is not needed + @retval false on success + @retval true on error (bad values, or EOM) + */ + bool create_interval_from_interval_list(MEM_ROOT *mem_root, + bool reuse_interval_list_values); + + /* + Calculate TYPELIB (set or enum) max and total lengths + + @param cs charset+collation pair of the interval + @param max_length length of the longest item + @param tot_length sum of the item lengths + + After this method call: + - ENUM uses max_length + - SET uses tot_length. + */ + void calculate_interval_lengths(uint32 *max_length, uint32 *tot_length) + { + const char **pos; + uint *len; + *max_length= *tot_length= 0; + for (pos= interval->type_names, len= interval->type_lengths; + *pos ; pos++, len++) + { + size_t length= charset->numchars(*pos, *pos + *len); + DBUG_ASSERT(length < UINT_MAX32); + *tot_length+= (uint) length; + set_if_bigger(*max_length, (uint32)length); + } + } + bool prepare_stage1_check_typelib_default(); + bool prepare_stage1_convert_default(THD *, MEM_ROOT *, CHARSET_INFO *to); + const Type_handler *field_type() const; // Prevent using this + Compression_method *compression_method_ptr; +public: + LEX_CSTRING field_name; + LEX_CSTRING comment; // Comment for field + enum enum_column_versioning + { + VERSIONING_NOT_SET, + WITH_VERSIONING, + WITHOUT_VERSIONING + }; + Item *on_update; // ON UPDATE NOW() + field_visibility_t invisible; + /* + The value of `length' as set by parser: is the number of characters + for most of the types, or of bytes for BLOBs or numeric types. + */ + uint32 char_length; + uint flags, pack_length; + List<String> interval_list; + engine_option_value *option_list; + + + /* + This is additinal data provided for any computed(virtual) field. + In particular it includes a pointer to the item by which this field + can be computed from other fields. + */ + Virtual_column_info + *vcol_info, // Virtual field + *default_value, // Default value + *check_constraint; // Check constraint + + enum_column_versioning versioning; + + Table_period_info *period; + + Column_definition() + :Type_handler_hybrid_field_type(&type_handler_null), + compression_method_ptr(0), + comment(null_clex_str), + on_update(NULL), invisible(VISIBLE), char_length(0), + flags(0), pack_length(0), + option_list(NULL), + vcol_info(0), default_value(0), check_constraint(0), + versioning(VERSIONING_NOT_SET), period(NULL) + { + interval_list.empty(); + } + + Column_definition(THD *thd, Field *field, Field *orig_field); + bool set_attributes(THD *thd, + const Lex_field_type_st &attr, + CHARSET_INFO *cs, + column_definition_type_t type); + void create_length_to_internal_length_null() + { + DBUG_ASSERT(length == 0); + pack_length= 0; + } + void create_length_to_internal_length_simple() + { + pack_length= type_handler()->calc_pack_length((uint32) length); + } + void create_length_to_internal_length_string() + { + length*= charset->mbmaxlen; + if (real_field_type() == MYSQL_TYPE_VARCHAR && compression_method()) + length++; + set_if_smaller(length, UINT_MAX32); + pack_length= type_handler()->calc_pack_length((uint32) length); + } + void create_length_to_internal_length_typelib() + { + /* Pack_length already calculated in sql_parse.cc */ + length*= charset->mbmaxlen; + } + bool vers_sys_field() const + { + return flags & (VERS_SYS_START_FLAG | VERS_SYS_END_FLAG); + } + void create_length_to_internal_length_bit(); + void create_length_to_internal_length_newdecimal(); + + /* + Prepare the "charset" member for string data types, + such as CHAR, VARCHAR, TEXT, ENUM, SET: + - derive the charset if not specified explicitly + - find a _bin collation if the BINARY comparison style was specified, e.g.: + CREATE TABLE t1 (a VARCHAR(10) BINARY) CHARSET utf8; + */ + bool prepare_charset_for_string(const Column_derived_attributes *dattr); + + /** + Prepare a SET/ENUM field. + Create "interval" from "interval_list" if needed, and adjust "length". + @param mem_root - Memory root to allocate TYPELIB and + its values on + @param reuse_interval_list_values - determines if TYPELIB can reuse value + buffers from interval_list, or should + always allocate a copy on mem_root, + even if character set conversion + is not needed + */ + bool prepare_interval_field(MEM_ROOT *mem_root, + bool reuse_interval_list_values); + + void prepare_interval_field_calc_length() + { + uint32 field_length, dummy; + if (real_field_type() == MYSQL_TYPE_SET) + { + calculate_interval_lengths(&dummy, &field_length); + length= field_length + (interval->count - 1); + } + else /* MYSQL_TYPE_ENUM */ + { + calculate_interval_lengths(&field_length, &dummy); + length= field_length; + } + set_if_smaller(length, MAX_FIELD_WIDTH - 1); + } + + bool prepare_blob_field(THD *thd); + + bool sp_prepare_create_field(THD *thd, MEM_ROOT *mem_root); + + bool prepare_stage1(THD *thd, MEM_ROOT *mem_root, + handler *file, ulonglong table_flags, + const Column_derived_attributes *derived_attr); + void prepare_stage1_simple(CHARSET_INFO *cs) + { + charset= cs; + create_length_to_internal_length_simple(); + } + bool prepare_stage1_typelib(THD *thd, MEM_ROOT *mem_root, + handler *file, ulonglong table_flags); + bool prepare_stage1_string(THD *thd, MEM_ROOT *mem_root, + handler *file, ulonglong table_flags); + bool prepare_stage1_bit(THD *thd, MEM_ROOT *mem_root, + handler *file, ulonglong table_flags); + + bool bulk_alter(const Column_derived_attributes *derived_attr, + const Column_bulk_alter_attributes *bulk_attr) + { + return type_handler()->Column_definition_bulk_alter(this, + derived_attr, + bulk_attr); + } + void redefine_stage1_common(const Column_definition *dup_field, + const handler *file); + bool redefine_stage1(const Column_definition *dup_field, const handler *file) + { + const Type_handler *handler= dup_field->type_handler(); + return handler->Column_definition_redefine_stage1(this, dup_field, file); + } + bool prepare_stage2(handler *handler, ulonglong table_flags); + bool prepare_stage2_blob(handler *handler, + ulonglong table_flags, uint field_flags); + bool prepare_stage2_varchar(ulonglong table_flags); + bool prepare_stage2_typelib(const char *type_name, uint field_flags, + uint *dup_val_count); + uint pack_flag_numeric() const; + uint sign_length() const { return flags & UNSIGNED_FLAG ? 0 : 1; } + bool check_length(uint mysql_errno, uint max_allowed_length) const; + bool fix_attributes_real(uint default_length); + bool fix_attributes_int(uint default_length); + bool fix_attributes_decimal(); + bool fix_attributes_temporal_with_time(uint int_part_length); + bool fix_attributes_bit(); + + bool check(THD *thd); + bool validate_check_constraint(THD *thd); + + bool stored_in_db() const { return !vcol_info || vcol_info->stored_in_db; } + + ha_storage_media field_storage_type() const + { + return (ha_storage_media) + ((flags >> FIELD_FLAGS_STORAGE_MEDIA) & 3); + } + + column_format_type column_format() const + { + return (column_format_type) + ((flags >> FIELD_FLAGS_COLUMN_FORMAT) & 3); + } + + bool has_default_function() const + { + return unireg_check != Field::NONE; + } + + Field *make_field(TABLE_SHARE *share, MEM_ROOT *mem_root, + const Record_addr *addr, + const LEX_CSTRING *field_name_arg) const + { + return Column_definition_attributes::make_field(share, mem_root, addr, + type_handler(), + field_name_arg, flags); + } + Field *make_field(TABLE_SHARE *share, MEM_ROOT *mem_root, + const LEX_CSTRING *field_name_arg) const + { + Record_addr addr(true); + return make_field(share, mem_root, &addr, field_name_arg); + } + /* Return true if default is an expression that must be saved explicitely */ + bool has_default_expression(); + + bool has_default_now_unireg_check() const + { + return unireg_check == Field::TIMESTAMP_DN_FIELD + || unireg_check == Field::TIMESTAMP_DNUN_FIELD; + } + + void set_type(const Column_definition &other) + { + set_handler(other.type_handler()); + length= other.length; + char_length= other.char_length; + decimals= other.decimals; + flags= other.flags; + pack_length= other.pack_length; + unireg_check= other.unireg_check; + interval= other.interval; + charset= other.charset; + srid= other.srid; + pack_flag= other.pack_flag; + } + + // Replace the entire value by another definition + void set_column_definition(const Column_definition *def) + { + *this= *def; + } + bool set_compressed(const char *method); + bool set_compressed_deprecated(THD *thd, const char *method); + bool set_compressed_deprecated_column_attribute(THD *thd, + const char *pos, + const char *method); + void set_compression_method(Compression_method *compression_method_arg) + { compression_method_ptr= compression_method_arg; } + Compression_method *compression_method() const + { return compression_method_ptr; } + + bool check_vcol_for_key(THD *thd) const; +}; + + +/** + List of ROW element definitions, e.g.: + DECLARE a ROW(a INT,b VARCHAR(10)) +*/ +class Row_definition_list: public List<class Spvar_definition> +{ +public: + inline bool eq_name(const Spvar_definition *def, const LEX_CSTRING *name) const; + /** + Find a ROW field by name. + @param [IN] name - the name + @param [OUT] offset - if the ROW field found, its offset it returned here + @retval NULL - the ROW field was not found + @retval !NULL - the pointer to the found ROW field + */ + Spvar_definition *find_row_field_by_name(const LEX_CSTRING *name, uint *offset) const + { + // Cast-off the "const" qualifier + List_iterator<Spvar_definition> it(*((List<Spvar_definition>*)this)); + Spvar_definition *def; + for (*offset= 0; (def= it++); (*offset)++) + { + if (eq_name(def, name)) + return def; + } + return 0; + } + static Row_definition_list *make(MEM_ROOT *mem_root, Spvar_definition *var) + { + Row_definition_list *list; + if (!(list= new (mem_root) Row_definition_list())) + return NULL; + return list->push_back(var, mem_root) ? NULL : list; + } + bool append_uniq(MEM_ROOT *thd, Spvar_definition *var); + bool adjust_formal_params_to_actual_params(THD *thd, List<Item> *args); + bool adjust_formal_params_to_actual_params(THD *thd, + Item **args, uint arg_count); + bool resolve_type_refs(THD *); +}; + +/** + This class is used during a stored routine or a trigger execution, + at sp_rcontext::create() time. + Currently it can represent: + - variables with explicit data types: DECLARE a INT; + - variables with data type references: DECLARE a t1.a%TYPE; + - ROW type variables + + Notes: + - Scalar variables have m_field_definitions==NULL. + - ROW variables are defined as having MYSQL_TYPE_NULL, + with a non-empty m_field_definitions. + + Data type references to other object types will be added soon, e.g.: + - DECLARE a table_name%ROWTYPE; + - DECLARE a cursor_name%ROWTYPE; + - DECLARE a record_name%TYPE; + - DECLARE a variable_name%TYPE; +*/ +class Spvar_definition: public Column_definition +{ + Qualified_column_ident *m_column_type_ref; // for %TYPE + Table_ident *m_table_rowtype_ref; // for table%ROWTYPE + bool m_cursor_rowtype_ref; // for cursor%ROWTYPE + uint m_cursor_rowtype_offset; // for cursor%ROWTYPE + Row_definition_list *m_row_field_definitions; // for ROW +public: + Spvar_definition() + :m_column_type_ref(NULL), + m_table_rowtype_ref(NULL), + m_cursor_rowtype_ref(false), + m_cursor_rowtype_offset(0), + m_row_field_definitions(NULL) + { } + Spvar_definition(THD *thd, Field *field) + :Column_definition(thd, field, NULL), + m_column_type_ref(NULL), + m_table_rowtype_ref(NULL), + m_cursor_rowtype_ref(false), + m_cursor_rowtype_offset(0), + m_row_field_definitions(NULL) + { } + const Type_handler *type_handler() const + { + return Type_handler_hybrid_field_type::type_handler(); + } + bool is_column_type_ref() const { return m_column_type_ref != 0; } + bool is_table_rowtype_ref() const { return m_table_rowtype_ref != 0; } + bool is_cursor_rowtype_ref() const { return m_cursor_rowtype_ref; } + bool is_explicit_data_type() const + { + return !is_column_type_ref() && + !is_table_rowtype_ref() && + !is_cursor_rowtype_ref(); + } + Qualified_column_ident *column_type_ref() const + { + return m_column_type_ref; + } + void set_column_type_ref(Qualified_column_ident *ref) + { + m_column_type_ref= ref; + } + + Table_ident *table_rowtype_ref() const + { + return m_table_rowtype_ref; + } + void set_table_rowtype_ref(Table_ident *ref) + { + DBUG_ASSERT(ref); + set_handler(&type_handler_row); + m_table_rowtype_ref= ref; + } + + uint cursor_rowtype_offset() const + { + return m_cursor_rowtype_offset; + } + void set_cursor_rowtype_ref(uint offset) + { + set_handler(&type_handler_row); + m_cursor_rowtype_ref= true; + m_cursor_rowtype_offset= offset; + } + + /* + Find a ROW field by name. + See Row_field_list::find_row_field_by_name() for details. + */ + Spvar_definition *find_row_field_by_name(const LEX_CSTRING *name, uint *offset) const + { + DBUG_ASSERT(m_row_field_definitions); + return m_row_field_definitions->find_row_field_by_name(name, offset); + } + uint is_row() const + { + return m_row_field_definitions != NULL; + } + // Check if "this" defines a ROW variable with n elements + uint is_row(uint n) const + { + return m_row_field_definitions != NULL && + m_row_field_definitions->elements == n; + } + Row_definition_list *row_field_definitions() const + { + return m_row_field_definitions; + } + void set_row_field_definitions(Row_definition_list *list) + { + DBUG_ASSERT(list); + set_handler(&type_handler_row); + m_row_field_definitions= list; + } + +}; + + +inline bool Row_definition_list::eq_name(const Spvar_definition *def, + const LEX_CSTRING *name) const +{ + return def->field_name.length == name->length && my_strcasecmp(system_charset_info, def->field_name.str, name->str) == 0; +} + + +class Create_field :public Column_definition +{ +public: + LEX_CSTRING change; // If done with alter table + LEX_CSTRING after; // Put column after this one + Field *field; // For alter table + const TYPELIB *save_interval; // Temporary copy for the above + // Used only for UCS2 intervals + + /** structure with parsed options (for comparing fields in ALTER TABLE) */ + ha_field_option_struct *option_struct; + uint offset; + uint8 interval_id; + bool create_if_not_exists; // Used in ALTER TABLE IF NOT EXISTS + + Create_field(): + Column_definition(), + field(0), option_struct(NULL), + create_if_not_exists(false) + { + change= after= null_clex_str; + } + Create_field(THD *thd, Field *old_field, Field *orig_field): + Column_definition(thd, old_field, orig_field), + change(old_field->field_name), + field(old_field), option_struct(old_field->option_struct), + create_if_not_exists(false) + { + after= null_clex_str; + } + /* Used to make a clone of this object for ALTER/CREATE TABLE */ + Create_field *clone(MEM_ROOT *mem_root) const; +}; + + +/* + A class for sending info to the client +*/ + +class Send_field :public Sql_alloc, + public Type_handler_hybrid_field_type, + public Send_field_extended_metadata +{ +public: + LEX_CSTRING db_name; + LEX_CSTRING table_name, org_table_name; + LEX_CSTRING col_name, org_col_name; + ulong length; + uint flags, decimals; + Send_field(Field *field) + { + field->make_send_field(this); + DBUG_ASSERT(table_name.str != 0); + normalize(); + } + Send_field(THD *thd, Item *item); + Send_field(Field *field, + const LEX_CSTRING &db_name_arg, + const LEX_CSTRING &table_name_arg) + :Type_handler_hybrid_field_type(field->type_handler()), + db_name(db_name_arg), + table_name(table_name_arg), + org_table_name(table_name_arg), + col_name(field->field_name), + org_col_name(field->field_name), + length(field->field_length), + flags(field->table->maybe_null ? + (field->flags & ~NOT_NULL_FLAG) : field->flags), + decimals(field->decimals()) + { + normalize(); + } + +private: + void normalize() + { + /* limit number of decimals for float and double */ + if (type_handler()->field_type() == MYSQL_TYPE_FLOAT || + type_handler()->field_type() == MYSQL_TYPE_DOUBLE) + set_if_smaller(decimals, FLOATING_POINT_DECIMALS); + } +public: + // This should move to Type_handler eventually + uint32 max_char_length(CHARSET_INFO *cs) const + { + return type_handler()->field_type() >= MYSQL_TYPE_TINY_BLOB && + type_handler()->field_type() <= MYSQL_TYPE_BLOB + ? static_cast<uint32>(length / cs->mbminlen) + : static_cast<uint32>(length / cs->mbmaxlen); + } + uint32 max_octet_length(CHARSET_INFO *from, CHARSET_INFO *to) const + { + /* + For TEXT/BLOB columns, field_length describes the maximum data + length in bytes. There is no limit to the number of characters + that a TEXT column can store, as long as the data fits into + the designated space. + For the rest of textual columns, field_length is evaluated as + char_count * mbmaxlen, where character count is taken from the + definition of the column. In other words, the maximum number + of characters here is limited by the column definition. + + When one has a LONG TEXT column with a single-byte + character set, and the connection character set is multi-byte, the + client may get fields longer than UINT_MAX32, due to + <character set column> -> <character set connection> conversion. + In that case column max length would not fit into the 4 bytes + reserved for it in the protocol. So we cut it here to UINT_MAX32. + */ + return char_to_byte_length_safe(max_char_length(from), to->mbmaxlen); + } + + // This should move to Type_handler eventually + bool is_sane_float() const + { + return (decimals <= FLOATING_POINT_DECIMALS || + (type_handler()->field_type() != MYSQL_TYPE_FLOAT && + type_handler()->field_type() != MYSQL_TYPE_DOUBLE)); + } + bool is_sane_signess() const + { + if (type_handler() == type_handler()->type_handler_signed() && + type_handler() == type_handler()->type_handler_unsigned()) + return true; // Any signess is allowed, e.g. DOUBLE, DECIMAL + /* + We are here e.g. in case of INT data type. + The UNSIGNED_FLAG bit must match in flags and in the type handler. + */ + return ((bool) (flags & UNSIGNED_FLAG)) == type_handler()->is_unsigned(); + } + bool is_sane() const + { + return is_sane_float() && is_sane_signess(); + } +}; + + +/* + A class for quick copying data to fields +*/ + +class Copy_field :public Sql_alloc { +public: + uchar *from_ptr,*to_ptr; + uchar *from_null_ptr,*to_null_ptr; + bool *null_row; + uint from_bit,to_bit; + /** + Number of bytes in the fields pointed to by 'from_ptr' and + 'to_ptr'. Usually this is the number of bytes that are copied from + 'from_ptr' to 'to_ptr'. + + For variable-length fields (VARCHAR), the first byte(s) describe + the actual length of the text. For VARCHARs with length + < 256 there is 1 length byte + >= 256 there is 2 length bytes + Thus, if from_field is VARCHAR(10), from_length (and in most cases + to_length) is 11. For VARCHAR(1024), the length is 1026. @see + Field_varstring::length_bytes + + Note that for VARCHARs, do_copy() will be do_varstring*() which + only copies the length-bytes (1 or 2) + the actual length of the + text instead of from/to_length bytes. + */ + uint from_length,to_length; + Field *from_field,*to_field; + String tmp; // For items + + Copy_field() {} + ~Copy_field() {} + void set(Field *to,Field *from,bool save); // Field to field + void set(uchar *to,Field *from); // Field to string + void (*do_copy)(Copy_field *); + void (*do_copy2)(Copy_field *); // Used to handle null values +}; + + +uint pack_length_to_packflag(uint type); +enum_field_types get_blob_type_from_length(ulong length); +int set_field_to_null(Field *field); +int set_field_to_null_with_conversions(Field *field, bool no_conversions); +int convert_null_to_field_value_or_error(Field *field); +bool check_expression(Virtual_column_info *vcol, const LEX_CSTRING *name, + enum_vcol_info_type type, Alter_info *alter_info= NULL); + +/* + The following are for the interface with the .frm file +*/ + +#define FIELDFLAG_DECIMAL 1U +#define FIELDFLAG_BINARY 1U // Shares same flag +#define FIELDFLAG_NUMBER 2U +#define FIELDFLAG_ZEROFILL 4U +#define FIELDFLAG_PACK 120U // Bits used for packing +#define FIELDFLAG_INTERVAL 256U // mangled with decimals! +#define FIELDFLAG_BITFIELD 512U // mangled with decimals! +#define FIELDFLAG_BLOB 1024U // mangled with decimals! +#define FIELDFLAG_GEOM 2048U // mangled with decimals! + +#define FIELDFLAG_TREAT_BIT_AS_CHAR 4096U /* use Field_bit_as_char */ +#define FIELDFLAG_LONG_DECIMAL 8192U +#define FIELDFLAG_NO_DEFAULT 16384U /* sql */ +#define FIELDFLAG_MAYBE_NULL 32768U // sql +#define FIELDFLAG_HEX_ESCAPE 0x10000U +#define FIELDFLAG_PACK_SHIFT 3 +#define FIELDFLAG_DEC_SHIFT 8 +#define FIELDFLAG_MAX_DEC 63U + +#define FIELDFLAG_DEC_MASK 0x3F00U + +#define MTYP_TYPENR(type) ((type) & 127U) // Remove bits from type + +#define f_is_dec(x) ((x) & FIELDFLAG_DECIMAL) +#define f_is_num(x) ((x) & FIELDFLAG_NUMBER) +#define f_is_zerofill(x) ((x) & FIELDFLAG_ZEROFILL) +#define f_is_packed(x) ((x) & FIELDFLAG_PACK) +#define f_packtype(x) (((x) >> FIELDFLAG_PACK_SHIFT) & 15) +#define f_decimals(x) ((uint8) (((x) >> FIELDFLAG_DEC_SHIFT) & FIELDFLAG_MAX_DEC)) +#define f_is_alpha(x) (!f_is_num(x)) +#define f_is_binary(x) ((x) & FIELDFLAG_BINARY) // 4.0- compatibility +#define f_is_enum(x) (((x) & (FIELDFLAG_INTERVAL | FIELDFLAG_NUMBER)) == FIELDFLAG_INTERVAL) +#define f_is_bitfield(x) (((x) & (FIELDFLAG_BITFIELD | FIELDFLAG_NUMBER)) == FIELDFLAG_BITFIELD) +#define f_is_blob(x) (((x) & (FIELDFLAG_BLOB | FIELDFLAG_NUMBER)) == FIELDFLAG_BLOB) +#define f_is_geom(x) (((x) & (FIELDFLAG_GEOM | FIELDFLAG_NUMBER)) == FIELDFLAG_GEOM) +#define f_settype(x) (((uint) (x)) << FIELDFLAG_PACK_SHIFT) +#define f_maybe_null(x) ((x) & FIELDFLAG_MAYBE_NULL) +#define f_no_default(x) ((x) & FIELDFLAG_NO_DEFAULT) +#define f_bit_as_char(x) ((x) & FIELDFLAG_TREAT_BIT_AS_CHAR) +#define f_is_hex_escape(x) ((x) & FIELDFLAG_HEX_ESCAPE) +#define f_visibility(x) (static_cast<field_visibility_t> ((x) & INVISIBLE_MAX_BITS)) + +inline +ulonglong TABLE::vers_end_id() const +{ + DBUG_ASSERT(versioned(VERS_TRX_ID)); + return static_cast<ulonglong>(vers_end_field()->val_int()); +} + +inline +ulonglong TABLE::vers_start_id() const +{ + DBUG_ASSERT(versioned(VERS_TRX_ID)); + return static_cast<ulonglong>(vers_start_field()->val_int()); +} + + +#endif /* FIELD_INCLUDED */ |