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Diffstat (limited to 'sql/item_func.h')
| -rw-r--r-- | sql/item_func.h | 3792 |
1 files changed, 3792 insertions, 0 deletions
diff --git a/sql/item_func.h b/sql/item_func.h new file mode 100644 index 00000000..a7dbb9ab --- /dev/null +++ b/sql/item_func.h @@ -0,0 +1,3792 @@ +#ifndef ITEM_FUNC_INCLUDED +#define ITEM_FUNC_INCLUDED +/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. + Copyright (c) 2009, 2020, MariaDB + + 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 Street, Fifth Floor, Boston, MA 02110-1335 USA */ + + +/* Function items used by mysql */ + +#ifdef USE_PRAGMA_INTERFACE +#pragma interface /* gcc class implementation */ +#endif + +#ifdef HAVE_IEEEFP_H +extern "C" /* Bug in BSDI include file */ +{ +#include <ieeefp.h> +} +#endif + +#include "sql_udf.h" // udf_handler +#include "my_decimal.h" // string2my_decimal +#include <cmath> + + +class Item_func :public Item_func_or_sum, + protected With_sum_func_cache +{ + void sync_with_sum_func_and_with_field(List<Item> &list); +protected: + virtual bool check_arguments() const + { + return check_argument_types_scalar(0, arg_count); + } + bool check_argument_types_like_args0() const; + bool check_argument_types_scalar(uint start, uint end) const; + bool check_argument_types_traditional_scalar(uint start, uint end) const; + bool check_argument_types_or_binary(const Type_handler *handler, + uint start, uint end) const; + bool check_argument_types_can_return_int(uint start, uint end) const; + bool check_argument_types_can_return_real(uint start, uint end) const; + bool check_argument_types_can_return_str(uint start, uint end) const; + bool check_argument_types_can_return_text(uint start, uint end) const; + bool check_argument_types_can_return_date(uint start, uint end) const; + bool check_argument_types_can_return_time(uint start, uint end) const; + void print_cast_temporal(String *str, enum_query_type query_type); +public: + + table_map not_null_tables_cache; + + enum Functype { UNKNOWN_FUNC,EQ_FUNC,EQUAL_FUNC,NE_FUNC,LT_FUNC,LE_FUNC, + GE_FUNC,GT_FUNC,FT_FUNC, + LIKE_FUNC,ISNULL_FUNC,ISNOTNULL_FUNC, + COND_AND_FUNC, COND_OR_FUNC, XOR_FUNC, + BETWEEN, IN_FUNC, MULT_EQUAL_FUNC, + INTERVAL_FUNC, ISNOTNULLTEST_FUNC, + SP_EQUALS_FUNC, SP_DISJOINT_FUNC,SP_INTERSECTS_FUNC, + SP_TOUCHES_FUNC,SP_CROSSES_FUNC,SP_WITHIN_FUNC, + SP_CONTAINS_FUNC,SP_OVERLAPS_FUNC, + SP_STARTPOINT,SP_ENDPOINT,SP_EXTERIORRING, + SP_POINTN,SP_GEOMETRYN,SP_INTERIORRINGN, SP_RELATE_FUNC, + NOT_FUNC, NOT_ALL_FUNC, TEMPTABLE_ROWID, + NOW_FUNC, NOW_UTC_FUNC, SYSDATE_FUNC, TRIG_COND_FUNC, + SUSERVAR_FUNC, GUSERVAR_FUNC, COLLATE_FUNC, + EXTRACT_FUNC, CHAR_TYPECAST_FUNC, FUNC_SP, UDF_FUNC, + NEG_FUNC, GSYSVAR_FUNC, IN_OPTIMIZER_FUNC, DYNCOL_FUNC, + JSON_EXTRACT_FUNC, JSON_VALID_FUNC, + CASE_SEARCHED_FUNC, // Used by ColumnStore/Spider + CASE_SIMPLE_FUNC // Used by ColumnStore/spider + }; + static scalar_comparison_op functype_to_scalar_comparison_op(Functype type) + { + switch (type) { + case EQ_FUNC: return SCALAR_CMP_EQ; + case EQUAL_FUNC: return SCALAR_CMP_EQUAL; + case LT_FUNC: return SCALAR_CMP_LT; + case LE_FUNC: return SCALAR_CMP_LE; + case GE_FUNC: return SCALAR_CMP_GE; + case GT_FUNC: return SCALAR_CMP_GT; + default: break; + } + DBUG_ASSERT(0); + return SCALAR_CMP_EQ; + } + enum Type type() const { return FUNC_ITEM; } + virtual enum Functype functype() const { return UNKNOWN_FUNC; } + Item_func(THD *thd): Item_func_or_sum(thd) + { + with_field= 0; + with_param= 0; + } + Item_func(THD *thd, Item *a) + :Item_func_or_sum(thd, a), With_sum_func_cache(a) + { + with_param= a->with_param; + with_field= a->with_field; + } + Item_func(THD *thd, Item *a, Item *b) + :Item_func_or_sum(thd, a, b), With_sum_func_cache(a, b) + { + with_param= a->with_param || b->with_param; + with_field= a->with_field || b->with_field; + } + Item_func(THD *thd, Item *a, Item *b, Item *c) + :Item_func_or_sum(thd, a, b, c), With_sum_func_cache(a, b, c) + { + with_field= a->with_field || b->with_field || c->with_field; + with_param= a->with_param || b->with_param || c->with_param; + } + Item_func(THD *thd, Item *a, Item *b, Item *c, Item *d) + :Item_func_or_sum(thd, a, b, c, d), With_sum_func_cache(a, b, c, d) + { + with_field= a->with_field || b->with_field || + c->with_field || d->with_field; + with_param= a->with_param || b->with_param || + c->with_param || d->with_param; + } + Item_func(THD *thd, Item *a, Item *b, Item *c, Item *d, Item* e) + :Item_func_or_sum(thd, a, b, c, d, e), With_sum_func_cache(a, b, c, d, e) + { + with_field= a->with_field || b->with_field || + c->with_field || d->with_field || e->with_field; + with_param= a->with_param || b->with_param || + c->with_param || d->with_param || e->with_param; + } + Item_func(THD *thd, List<Item> &list): + Item_func_or_sum(thd, list) + { + set_arguments(thd, list); + } + // Constructor used for Item_cond_and/or (see Item comment) + Item_func(THD *thd, Item_func *item) + :Item_func_or_sum(thd, item), With_sum_func_cache(item), + not_null_tables_cache(item->not_null_tables_cache) + { } + bool fix_fields(THD *, Item **ref); + void cleanup() + { + Item_func_or_sum::cleanup(); + used_tables_and_const_cache_init(); + } + void fix_after_pullout(st_select_lex *new_parent, Item **ref, bool merge); + void quick_fix_field(); + table_map not_null_tables() const; + void update_used_tables() + { + used_tables_and_const_cache_init(); + used_tables_and_const_cache_update_and_join(arg_count, args); + } + COND *build_equal_items(THD *thd, COND_EQUAL *inherited, + bool link_item_fields, + COND_EQUAL **cond_equal_ref); + SEL_TREE *get_mm_tree(RANGE_OPT_PARAM *param, Item **cond_ptr) + { + DBUG_ENTER("Item_func::get_mm_tree"); + DBUG_RETURN(const_item() ? get_mm_tree_for_const(param) : NULL); + } + bool eq(const Item *item, bool binary_cmp) const; + virtual Item *key_item() const { return args[0]; } + void set_arguments(THD *thd, List<Item> &list) + { + Item_args::set_arguments(thd, list); + sync_with_sum_func_and_with_field(list); + list.empty(); // Fields are used + } + void split_sum_func(THD *thd, Ref_ptr_array ref_pointer_array, + List<Item> &fields, uint flags); + virtual void print(String *str, enum_query_type query_type); + void print_op(String *str, enum_query_type query_type); + void print_args(String *str, uint from, enum_query_type query_type); + bool is_null() { + update_null_value(); + return null_value; + } + String *val_str_from_val_str_ascii(String *str, String *str2); + + void signal_divide_by_null(); + friend class udf_handler; + Field *create_field_for_create_select(MEM_ROOT *root, TABLE *table) + { return tmp_table_field_from_field_type(root, table); } + Item *get_tmp_table_item(THD *thd); + + void fix_char_length_ulonglong(ulonglong max_char_length_arg) + { + ulonglong max_result_length= max_char_length_arg * + collation.collation->mbmaxlen; + if (max_result_length >= MAX_BLOB_WIDTH) + { + max_length= MAX_BLOB_WIDTH; + maybe_null= 1; + } + else + max_length= (uint32) max_result_length; + } + Item *transform(THD *thd, Item_transformer transformer, uchar *arg); + Item* compile(THD *thd, Item_analyzer analyzer, uchar **arg_p, + Item_transformer transformer, uchar *arg_t); + void traverse_cond(Cond_traverser traverser, + void * arg, traverse_order order); + bool eval_not_null_tables(void *opt_arg); + bool find_not_null_fields(table_map allowed); + // bool is_expensive_processor(void *arg); + // virtual bool is_expensive() { return 0; } + inline void raise_numeric_overflow(const char *type_name) + { + char buf[256]; + String str(buf, sizeof(buf), system_charset_info); + str.length(0); + print(&str, QT_NO_DATA_EXPANSION); + my_error(ER_DATA_OUT_OF_RANGE, MYF(0), type_name, str.c_ptr_safe()); + } + inline double raise_float_overflow() + { + raise_numeric_overflow("DOUBLE"); + return 0.0; + } + inline longlong raise_integer_overflow() + { + raise_numeric_overflow(unsigned_flag ? "BIGINT UNSIGNED": "BIGINT"); + return 0; + } + inline int raise_decimal_overflow() + { + raise_numeric_overflow("DECIMAL"); + return E_DEC_OVERFLOW; + } + /** + Throw an error if the input double number is not finite, i.e. is either + +/-INF or NAN. + */ + inline double check_float_overflow(double value) + { + return std::isfinite(value) ? value : raise_float_overflow(); + } + /** + Throw an error if the input BIGINT value represented by the + (longlong value, bool unsigned flag) pair cannot be returned by the + function, i.e. is not compatible with this Item's unsigned_flag. + */ + inline longlong check_integer_overflow(longlong value, bool val_unsigned) + { + if ((unsigned_flag && !val_unsigned && value < 0) || + (!unsigned_flag && val_unsigned && + (ulonglong) value > (ulonglong) LONGLONG_MAX)) + return raise_integer_overflow(); + return value; + } + /** + Throw an error if the error code of a DECIMAL operation is E_DEC_OVERFLOW. + */ + inline int check_decimal_overflow(int error) + { + return (error == E_DEC_OVERFLOW) ? raise_decimal_overflow() : error; + } + + bool has_timestamp_args() + { + DBUG_ASSERT(fixed == TRUE); + for (uint i= 0; i < arg_count; i++) + { + if (args[i]->type() == Item::FIELD_ITEM && + args[i]->field_type() == MYSQL_TYPE_TIMESTAMP) + return TRUE; + } + return FALSE; + } + + bool has_date_args() + { + DBUG_ASSERT(fixed == TRUE); + for (uint i= 0; i < arg_count; i++) + { + if (args[i]->type() == Item::FIELD_ITEM && + (args[i]->field_type() == MYSQL_TYPE_DATE || + args[i]->field_type() == MYSQL_TYPE_DATETIME)) + return TRUE; + } + return FALSE; + } + + bool has_time_args() + { + DBUG_ASSERT(fixed == TRUE); + for (uint i= 0; i < arg_count; i++) + { + if (args[i]->type() == Item::FIELD_ITEM && + (args[i]->field_type() == MYSQL_TYPE_TIME || + args[i]->field_type() == MYSQL_TYPE_DATETIME)) + return TRUE; + } + return FALSE; + } + + bool has_datetime_args() + { + DBUG_ASSERT(fixed == TRUE); + for (uint i= 0; i < arg_count; i++) + { + if (args[i]->type() == Item::FIELD_ITEM && + args[i]->field_type() == MYSQL_TYPE_DATETIME) + return TRUE; + } + return FALSE; + } + + Item* propagate_equal_fields(THD *thd, const Context &ctx, COND_EQUAL *cond) + { + /* + By default only substitution for a field whose two different values + are never equal is allowed in the arguments of a function. + This is overruled for the direct arguments of comparison functions. + */ + Item_args::propagate_equal_fields(thd, Context_identity(), cond); + return this; + } + + bool has_rand_bit() + { + return used_tables() & RAND_TABLE_BIT; + } + + bool excl_dep_on_table(table_map tab_map) + { + if (used_tables() & OUTER_REF_TABLE_BIT) + return false; + return !(used_tables() & ~tab_map) || + Item_args::excl_dep_on_table(tab_map); + } + + bool excl_dep_on_grouping_fields(st_select_lex *sel) + { + if (has_rand_bit() || with_subquery()) + return false; + return Item_args::excl_dep_on_grouping_fields(sel); + } + + bool excl_dep_on_in_subq_left_part(Item_in_subselect *subq_pred) + { + return Item_args::excl_dep_on_in_subq_left_part(subq_pred); + } + + /* + We assume the result of any function that has a TIMESTAMP argument to be + timezone-dependent, since a TIMESTAMP value in both numeric and string + contexts is interpreted according to the current timezone. + The only exception is UNIX_TIMESTAMP() which returns the internal + representation of a TIMESTAMP argument verbatim, and thus does not depend on + the timezone. + */ + virtual bool check_valid_arguments_processor(void *bool_arg) + { + return has_timestamp_args(); + } + + virtual bool find_function_processor (void *arg) + { + return functype() == *(Functype *) arg; + } + + void no_rows_in_result() + { + for (uint i= 0; i < arg_count; i++) + { + args[i]->no_rows_in_result(); + } + } + void restore_to_before_no_rows_in_result() + { + for (uint i= 0; i < arg_count; i++) + { + args[i]->no_rows_in_result(); + } + } + void convert_const_compared_to_int_field(THD *thd); + /** + Prepare arguments and setup a comparator. + Used in Item_func_xxx with two arguments and a comparator, + e.g. Item_bool_func2 and Item_func_nullif. + args[0] or args[1] can be modified: + - converted to character set and collation of the operation + - or replaced to an Item_int_with_ref + */ + bool setup_args_and_comparator(THD *thd, Arg_comparator *cmp); + + bool with_sum_func() const { return m_with_sum_func; } + With_sum_func_cache* get_with_sum_func_cache() { return this; } + Item_func *get_item_func() { return this; } + bool is_simplified_cond_processor(void *arg) + { return const_item() && !val_int(); } +}; + + +class Item_real_func :public Item_func +{ +public: + Item_real_func(THD *thd): Item_func(thd) { collation= DTCollation_numeric(); } + Item_real_func(THD *thd, Item *a): Item_func(thd, a) + { collation= DTCollation_numeric(); } + Item_real_func(THD *thd, Item *a, Item *b): Item_func(thd, a, b) + { collation= DTCollation_numeric(); } + Item_real_func(THD *thd, List<Item> &list): Item_func(thd, list) + { collation= DTCollation_numeric(); } + String *val_str(String*str); + my_decimal *val_decimal(my_decimal *decimal_value); + longlong val_int() + { + DBUG_ASSERT(fixed == 1); + return Converter_double_to_longlong(val_real(), unsigned_flag).result(); + } + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) + { return get_date_from_real(thd, ltime, fuzzydate); } + const Type_handler *type_handler() const { return &type_handler_double; } + bool fix_length_and_dec() + { + decimals= NOT_FIXED_DEC; + max_length= float_length(decimals); + return FALSE; + } +}; + + +/** + Functions whose returned field type is determined at fix_fields() time. +*/ +class Item_hybrid_func: public Item_func, + public Type_handler_hybrid_field_type +{ +protected: + bool fix_attributes(Item **item, uint nitems); +public: + Item_hybrid_func(THD *thd): Item_func(thd) { } + Item_hybrid_func(THD *thd, Item *a): Item_func(thd, a) { } + Item_hybrid_func(THD *thd, Item *a, Item *b): Item_func(thd, a, b) { } + Item_hybrid_func(THD *thd, Item *a, Item *b, Item *c): + Item_func(thd, a, b, c) { } + Item_hybrid_func(THD *thd, List<Item> &list): Item_func(thd, list) { } + Item_hybrid_func(THD *thd, Item_hybrid_func *item) + :Item_func(thd, item), Type_handler_hybrid_field_type(item) { } + const Type_handler *type_handler() const + { return Type_handler_hybrid_field_type::type_handler(); } + void fix_length_and_dec_long_or_longlong(uint char_length, bool unsigned_arg) + { + collation= DTCollation_numeric(); + unsigned_flag= unsigned_arg; + max_length= char_length; + set_handler(Type_handler::type_handler_long_or_longlong(char_length, + unsigned_arg)); + } + void fix_length_and_dec_ulong_or_ulonglong_by_nbits(uint nbits) + { + uint digits= Type_handler_bit::Bit_decimal_notation_int_digits_by_nbits(nbits); + collation= DTCollation_numeric(); + unsigned_flag= true; + max_length= digits; + if (nbits > 32) + set_handler(&type_handler_ulonglong); + else + set_handler(&type_handler_ulong); + } +}; + + +class Item_handled_func: public Item_func +{ +public: + class Handler + { + public: + virtual ~Handler() { } + virtual String *val_str(Item_handled_func *, String *) const= 0; + virtual String *val_str_ascii(Item_handled_func *, String *) const= 0; + virtual double val_real(Item_handled_func *) const= 0; + virtual longlong val_int(Item_handled_func *) const= 0; + virtual my_decimal *val_decimal(Item_handled_func *, my_decimal *) const= 0; + virtual bool get_date(THD *thd, Item_handled_func *, MYSQL_TIME *, date_mode_t fuzzydate) const= 0; + virtual bool val_native(THD *thd, Item_handled_func *, Native *to) const + { + DBUG_ASSERT(0); + to->length(0); + return true; + } + virtual const Type_handler * + return_type_handler(const Item_handled_func *item) const= 0; + virtual const Type_handler * + type_handler_for_create_select(const Item_handled_func *item) const + { + return return_type_handler(item); + } + virtual bool fix_length_and_dec(Item_handled_func *) const= 0; + }; + + class Handler_str: public Handler + { + public: + String *val_str_ascii(Item_handled_func *item, String *str) const + { + return item->Item::val_str_ascii(str); + } + double val_real(Item_handled_func *item) const + { + DBUG_ASSERT(item->is_fixed()); + StringBuffer<64> tmp; + String *res= item->val_str(&tmp); + return res ? item->double_from_string_with_check(res) : 0.0; + } + longlong val_int(Item_handled_func *item) const + { + DBUG_ASSERT(item->is_fixed()); + StringBuffer<22> tmp; + String *res= item->val_str(&tmp); + return res ? item->longlong_from_string_with_check(res) : 0; + } + my_decimal *val_decimal(Item_handled_func *item, my_decimal *to) const + { + return item->val_decimal_from_string(to); + } + bool get_date(THD *thd, Item_handled_func *item, MYSQL_TIME *to, + date_mode_t fuzzydate) const + { + return item->get_date_from_string(thd, to, fuzzydate); + } + }; + + /** + Abstract class for functions returning TIME, DATE, DATETIME or string values, + whose data type depends on parameters and is set at fix_fields time. + */ + class Handler_temporal: public Handler + { + public: + String *val_str(Item_handled_func *item, String *to) const + { + StringBuffer<MAX_FIELD_WIDTH> ascii_buf; + return item->val_str_from_val_str_ascii(to, &ascii_buf); + } + }; + + /** + Abstract class for functions returning strings, + which are generated from get_date() results, + when get_date() can return different MYSQL_TIMESTAMP_XXX per row. + */ + class Handler_temporal_string: public Handler_temporal + { + public: + const Type_handler *return_type_handler(const Item_handled_func *) const + { + return &type_handler_string; + } + const Type_handler * + type_handler_for_create_select(const Item_handled_func *item) const + { + return return_type_handler(item)->type_handler_for_tmp_table(item); + } + double val_real(Item_handled_func *item) const + { + return Temporal_hybrid(item).to_double(); + } + longlong val_int(Item_handled_func *item) const + { + return Temporal_hybrid(item).to_longlong(); + } + my_decimal *val_decimal(Item_handled_func *item, my_decimal *to) const + { + return Temporal_hybrid(item).to_decimal(to); + } + String *val_str_ascii(Item_handled_func *item, String *to) const + { + return Temporal_hybrid(item).to_string(to, item->decimals); + } + }; + + + class Handler_date: public Handler_temporal + { + public: + const Type_handler *return_type_handler(const Item_handled_func *) const + { + return &type_handler_newdate; + } + bool fix_length_and_dec(Item_handled_func *item) const + { + item->fix_attributes_date(); + return false; + } + double val_real(Item_handled_func *item) const + { + return Date(item).to_double(); + } + longlong val_int(Item_handled_func *item) const + { + return Date(item).to_longlong(); + } + my_decimal *val_decimal(Item_handled_func *item, my_decimal *to) const + { + return Date(item).to_decimal(to); + } + String *val_str_ascii(Item_handled_func *item, String *to) const + { + return Date(item).to_string(to); + } + }; + + + class Handler_time: public Handler_temporal + { + public: + const Type_handler *return_type_handler(const Item_handled_func *) const + { + return &type_handler_time2; + } + double val_real(Item_handled_func *item) const + { + return Time(item).to_double(); + } + longlong val_int(Item_handled_func *item) const + { + return Time(item).to_longlong(); + } + my_decimal *val_decimal(Item_handled_func *item, my_decimal *to) const + { + return Time(item).to_decimal(to); + } + String *val_str_ascii(Item_handled_func *item, String *to) const + { + return Time(item).to_string(to, item->decimals); + } + bool val_native(THD *thd, Item_handled_func *item, Native *to) const + { + return Time(thd, item).to_native(to, item->decimals); + } + }; + + + class Handler_datetime: public Handler_temporal + { + public: + const Type_handler *return_type_handler(const Item_handled_func *) const + { + return &type_handler_datetime2; + } + double val_real(Item_handled_func *item) const + { + return Datetime(item).to_double(); + } + longlong val_int(Item_handled_func *item) const + { + return Datetime(item).to_longlong(); + } + my_decimal *val_decimal(Item_handled_func *item, my_decimal *to) const + { + return Datetime(item).to_decimal(to); + } + String *val_str_ascii(Item_handled_func *item, String *to) const + { + return Datetime(item).to_string(to, item->decimals); + } + }; + + + class Handler_int: public Handler + { + public: + String *val_str(Item_handled_func *item, String *to) const + { + longlong nr= val_int(item); + if (item->null_value) + return 0; + to->set_int(nr, item->unsigned_flag, item->collation.collation); + return to; + } + String *val_str_ascii(Item_handled_func *item, String *to) const + { + return item->Item::val_str_ascii(to); + } + double val_real(Item_handled_func *item) const + { + return item->unsigned_flag ? (double) ((ulonglong) val_int(item)) : + (double) val_int(item); + } + my_decimal *val_decimal(Item_handled_func *item, my_decimal *to) const + { + return item->val_decimal_from_int(to); + } + bool get_date(THD *thd, Item_handled_func *item, + MYSQL_TIME *to, date_mode_t fuzzydate) const + { + return item->get_date_from_int(thd, to, fuzzydate); + } + longlong val_int(Item_handled_func *item) const + { + Longlong_null tmp= to_longlong_null(item); + item->null_value= tmp.is_null(); + return tmp.value(); + } + virtual Longlong_null to_longlong_null(Item_handled_func *item) const= 0; + }; + + class Handler_slong: public Handler_int + { + public: + const Type_handler *return_type_handler(const Item_handled_func *item) const + { + return &type_handler_slong; + } + bool fix_length_and_dec(Item_handled_func *item) const + { + item->unsigned_flag= false; + item->collation= DTCollation_numeric(); + item->fix_char_length(11); + return false; + } + }; + + class Handler_slong2: public Handler_slong + { + public: + bool fix_length_and_dec(Item_handled_func *func) const + { + bool rc= Handler_slong::fix_length_and_dec(func); + func->max_length= 2; + return rc; + } + }; + + class Handler_ulonglong: public Handler_int + { + public: + const Type_handler *return_type_handler(const Item_handled_func *item) const + { + return &type_handler_ulonglong; + } + bool fix_length_and_dec(Item_handled_func *item) const + { + item->unsigned_flag= true; + item->collation= DTCollation_numeric(); + item->fix_char_length(21); + return false; + } + }; + +protected: + const Handler *m_func_handler; +public: + Item_handled_func(THD *thd, Item *a) + :Item_func(thd, a), m_func_handler(NULL) { } + Item_handled_func(THD *thd, Item *a, Item *b) + :Item_func(thd, a, b), m_func_handler(NULL) { } + void set_func_handler(const Handler *handler) + { + m_func_handler= handler; + } + const Type_handler *type_handler() const + { + return m_func_handler->return_type_handler(this); + } + Field *create_field_for_create_select(MEM_ROOT *root, TABLE *table) + { + DBUG_ASSERT(fixed); + const Type_handler *h= m_func_handler->type_handler_for_create_select(this); + return h->make_and_init_table_field(root, &name, + Record_addr(maybe_null), + *this, table); + } + String *val_str(String *to) + { + return m_func_handler->val_str(this, to); + } + String *val_str_ascii(String *to) + { + return m_func_handler->val_str_ascii(this, to); + } + double val_real() + { + return m_func_handler->val_real(this); + } + longlong val_int() + { + return m_func_handler->val_int(this); + } + my_decimal *val_decimal(my_decimal *to) + { + return m_func_handler->val_decimal(this, to); + } + bool get_date(THD *thd, MYSQL_TIME *to, date_mode_t fuzzydate) + { + return m_func_handler->get_date(thd, this, to, fuzzydate); + } + bool val_native(THD *thd, Native *to) + { + return m_func_handler->val_native(thd, this, to); + } +}; + + +/** + Functions that at fix_fields() time determine the returned field type, + trying to preserve the exact data type of the arguments. + + The descendants have to implement "native" value methods, + i.e. str_op(), date_op(), int_op(), real_op(), decimal_op(). + fix_fields() chooses which of the above value methods will be + used during execution time, according to the returned field type. + + For example, if fix_fields() determines that the returned value type + is MYSQL_TYPE_LONG, then: + - int_op() is chosen as the execution time native method. + - val_int() returns the result of int_op() as is. + - all other methods, i.e. val_real(), val_decimal(), val_str(), get_date(), + call int_op() first, then convert the result to the requested data type. +*/ +class Item_func_hybrid_field_type: public Item_hybrid_func +{ + /* + Helper methods to make sure that the result of + decimal_op(), str_op() and date_op() is properly synched with null_value. + */ + bool date_op_with_null_check(THD *thd, MYSQL_TIME *ltime) + { + bool rc= date_op(thd, ltime, date_mode_t(0)); + DBUG_ASSERT(!rc ^ null_value); + return rc; + } + bool time_op_with_null_check(THD *thd, MYSQL_TIME *ltime) + { + bool rc= time_op(thd, ltime); + DBUG_ASSERT(!rc ^ null_value); + DBUG_ASSERT(rc || ltime->time_type == MYSQL_TIMESTAMP_TIME); + return rc; + } + String *str_op_with_null_check(String *str) + { + String *res= str_op(str); + DBUG_ASSERT((res != NULL) ^ null_value); + return res; + } + +public: + // Value methods that involve no conversion + String *val_str_from_str_op(String *str) + { + return str_op_with_null_check(&str_value); + } + longlong val_int_from_int_op() + { + return int_op(); + } + double val_real_from_real_op() + { + return real_op(); + } + + // Value methods that involve conversion + String *val_str_from_real_op(String *str); + String *val_str_from_int_op(String *str); + String *val_str_from_date_op(String *str); + String *val_str_from_time_op(String *str); + + my_decimal *val_decimal_from_str_op(my_decimal *dec); + my_decimal *val_decimal_from_real_op(my_decimal *dec); + my_decimal *val_decimal_from_int_op(my_decimal *dec); + my_decimal *val_decimal_from_date_op(my_decimal *dec); + my_decimal *val_decimal_from_time_op(my_decimal *dec); + + longlong val_int_from_str_op(); + longlong val_int_from_real_op(); + longlong val_int_from_date_op(); + longlong val_int_from_time_op(); + + double val_real_from_str_op(); + double val_real_from_date_op(); + double val_real_from_time_op(); + double val_real_from_int_op(); + +public: + Item_func_hybrid_field_type(THD *thd): + Item_hybrid_func(thd) + { collation= DTCollation_numeric(); } + Item_func_hybrid_field_type(THD *thd, Item *a): + Item_hybrid_func(thd, a) + { collation= DTCollation_numeric(); } + Item_func_hybrid_field_type(THD *thd, Item *a, Item *b): + Item_hybrid_func(thd, a, b) + { collation= DTCollation_numeric(); } + Item_func_hybrid_field_type(THD *thd, Item *a, Item *b, Item *c): + Item_hybrid_func(thd, a, b, c) + { collation= DTCollation_numeric(); } + Item_func_hybrid_field_type(THD *thd, List<Item> &list): + Item_hybrid_func(thd, list) + { collation= DTCollation_numeric(); } + + double val_real() + { + DBUG_ASSERT(fixed); + return Item_func_hybrid_field_type::type_handler()-> + Item_func_hybrid_field_type_val_real(this); + } + longlong val_int() + { + DBUG_ASSERT(fixed); + return Item_func_hybrid_field_type::type_handler()-> + Item_func_hybrid_field_type_val_int(this); + } + my_decimal *val_decimal(my_decimal *dec) + { + DBUG_ASSERT(fixed); + return Item_func_hybrid_field_type::type_handler()-> + Item_func_hybrid_field_type_val_decimal(this, dec); + } + String *val_str(String*str) + { + DBUG_ASSERT(fixed); + String *res= Item_func_hybrid_field_type::type_handler()-> + Item_func_hybrid_field_type_val_str(this, str); + DBUG_ASSERT(null_value == (res == NULL)); + return res; + } + bool get_date(THD *thd, MYSQL_TIME *to, date_mode_t mode) + { + DBUG_ASSERT(fixed); + return Item_func_hybrid_field_type::type_handler()-> + Item_func_hybrid_field_type_get_date_with_warn(thd, this, to, mode); + } + + bool val_native(THD *thd, Native *to) + { + DBUG_ASSERT(fixed); + return native_op(thd, to); + } + + /** + @brief Performs the operation that this functions implements when the + result type is INT. + + @return The result of the operation. + */ + virtual longlong int_op()= 0; + Longlong_null to_longlong_null_op() + { + longlong nr= int_op(); + /* + C++ does not guarantee the order of parameter evaluation, + so to make sure "null_value" is passed to the constructor + after the int_op() call, int_op() is caled on a separate line. + */ + return Longlong_null(nr, null_value); + } + Longlong_hybrid_null to_longlong_hybrid_null_op() + { + return Longlong_hybrid_null(to_longlong_null_op(), unsigned_flag); + } + + /** + @brief Performs the operation that this functions implements when the + result type is REAL. + + @return The result of the operation. + */ + virtual double real_op()= 0; + Double_null to_double_null_op() + { + // val_real() must be caleed on a separate line. See to_longlong_null() + double nr= real_op(); + return Double_null(nr, null_value); + } + + /** + @brief Performs the operation that this functions implements when the + result type is DECIMAL. + + @param A pointer where the DECIMAL value will be allocated. + @return + - 0 If the result is NULL + - The same pointer it was given, with the area initialized to the + result of the operation. + */ + virtual my_decimal *decimal_op(my_decimal *)= 0; + + /** + @brief Performs the operation that this functions implements when the + result type is a string type. + + @return The result of the operation. + */ + virtual String *str_op(String *)= 0; + + /** + @brief Performs the operation that this functions implements when + field type is DATETIME or DATE. + @return The result of the operation. + */ + virtual bool date_op(THD *thd, MYSQL_TIME *res, date_mode_t fuzzydate)= 0; + + /** + @brief Performs the operation that this functions implements when + field type is TIME. + @return The result of the operation. + */ + virtual bool time_op(THD *thd, MYSQL_TIME *res)= 0; + + virtual bool native_op(THD *thd, Native *native)= 0; +}; + + +/* + This class resembles SQL standard CASE-alike expressions: + CASE and its abbreviations COALESCE, NULLIF, IFNULL, IF. + + <case expression> ::= <case abbreviation> + | <case specification> +*/ +class Item_func_case_expression: public Item_func_hybrid_field_type +{ +public: + Item_func_case_expression(THD *thd) + :Item_func_hybrid_field_type(thd) + { } + Item_func_case_expression(THD *thd, Item *a) + :Item_func_hybrid_field_type(thd, a) + { } + Item_func_case_expression(THD *thd, Item *a, Item *b) + :Item_func_hybrid_field_type(thd, a, b) + { } + Item_func_case_expression(THD *thd, Item *a, Item *b, Item *c) + :Item_func_hybrid_field_type(thd, a, b, c) + { } + Item_func_case_expression(THD *thd, List<Item> &list): + Item_func_hybrid_field_type(thd, list) + { } + bool find_not_null_fields(table_map allowed) { return false; } +}; + + +class Item_func_numhybrid: public Item_func_hybrid_field_type +{ +protected: + + inline void fix_decimals() + { + DBUG_ASSERT(result_type() == DECIMAL_RESULT); + if (decimals == NOT_FIXED_DEC) + set_if_smaller(decimals, max_length - 1); + } + +public: + Item_func_numhybrid(THD *thd): Item_func_hybrid_field_type(thd) + { } + Item_func_numhybrid(THD *thd, Item *a): Item_func_hybrid_field_type(thd, a) + { } + Item_func_numhybrid(THD *thd, Item *a, Item *b): + Item_func_hybrid_field_type(thd, a, b) + { } + Item_func_numhybrid(THD *thd, Item *a, Item *b, Item *c): + Item_func_hybrid_field_type(thd, a, b, c) + { } + Item_func_numhybrid(THD *thd, List<Item> &list): + Item_func_hybrid_field_type(thd, list) + { } + String *str_op(String *str) { DBUG_ASSERT(0); return 0; } + bool date_op(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) + { + DBUG_ASSERT(0); + return true; + } + bool time_op(THD *thd, MYSQL_TIME *ltime) + { + DBUG_ASSERT(0); + return true; + } + bool native_op(THD *thd, Native *to) + { + DBUG_ASSERT(0); + return true; + } +}; + + +/* function where type of result detected by first argument */ +class Item_func_num1: public Item_func_numhybrid +{ +public: + Item_func_num1(THD *thd, Item *a): Item_func_numhybrid(thd, a) {} + Item_func_num1(THD *thd, Item *a, Item *b): Item_func_numhybrid(thd, a, b) {} + bool check_partition_func_processor(void *int_arg) { return FALSE; } + bool check_vcol_func_processor(void *arg) { return FALSE; } +}; + + +/* Base class for operations like '+', '-', '*' */ +class Item_num_op :public Item_func_numhybrid +{ +protected: + bool check_arguments() const + { + return false; // Checked by aggregate_for_num_op() + } +public: + Item_num_op(THD *thd, Item *a, Item *b): Item_func_numhybrid(thd, a, b) {} + virtual void result_precision()= 0; + + virtual inline void print(String *str, enum_query_type query_type) + { + print_op(str, query_type); + } + bool fix_type_handler(const Type_aggregator *aggregator); + void fix_length_and_dec_double() + { + aggregate_numeric_attributes_real(args, arg_count); + max_length= float_length(decimals); + } + void fix_length_and_dec_decimal() + { + unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag; + result_precision(); + fix_decimals(); + } + void fix_length_and_dec_int() + { + unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag; + result_precision(); + decimals= 0; + set_handler(type_handler_long_or_longlong()); + } + void fix_length_and_dec_temporal(bool downcast_decimal_to_int) + { + set_handler(&type_handler_newdecimal); + fix_length_and_dec_decimal(); + if (decimals == 0 && downcast_decimal_to_int) + set_handler(type_handler_long_or_longlong()); + } + bool need_parentheses_in_default() { return true; } +}; + + +class Item_int_func :public Item_func +{ +public: + /* + QQ: shouldn't 20 characters be enough: + Max unsigned = 18,446,744,073,709,551,615 = 20 digits, 20 characters + Max signed = 9,223,372,036,854,775,807 = 19 digits, 19 characters + Min signed = -9,223,372,036,854,775,808 = 19 digits, 20 characters + */ + Item_int_func(THD *thd): Item_func(thd) + { collation= DTCollation_numeric(); fix_char_length(21); } + Item_int_func(THD *thd, Item *a): Item_func(thd, a) + { collation= DTCollation_numeric(); fix_char_length(21); } + Item_int_func(THD *thd, Item *a, Item *b): Item_func(thd, a, b) + { collation= DTCollation_numeric(); fix_char_length(21); } + Item_int_func(THD *thd, Item *a, Item *b, Item *c): Item_func(thd, a, b, c) + { collation= DTCollation_numeric(); fix_char_length(21); } + Item_int_func(THD *thd, Item *a, Item *b, Item *c, Item *d): + Item_func(thd, a, b, c, d) + { collation= DTCollation_numeric(); fix_char_length(21); } + Item_int_func(THD *thd, List<Item> &list): Item_func(thd, list) + { collation= DTCollation_numeric(); fix_char_length(21); } + Item_int_func(THD *thd, Item_int_func *item) :Item_func(thd, item) + { collation= DTCollation_numeric(); } + double val_real(); + String *val_str(String*str); + my_decimal *val_decimal(my_decimal *decimal_value) + { + return val_decimal_from_int(decimal_value); + } + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) + { return get_date_from_int(thd, ltime, fuzzydate); } + const Type_handler *type_handler() const= 0; + bool fix_length_and_dec() { return FALSE; } +}; + + +class Item_long_func: public Item_int_func +{ +public: + Item_long_func(THD *thd): Item_int_func(thd) { } + Item_long_func(THD *thd, Item *a): Item_int_func(thd, a) {} + Item_long_func(THD *thd, Item *a, Item *b): Item_int_func(thd, a, b) {} + Item_long_func(THD *thd, Item *a, Item *b, Item *c): Item_int_func(thd, a, b, c) {} + Item_long_func(THD *thd, List<Item> &list): Item_int_func(thd, list) { } + Item_long_func(THD *thd, Item_long_func *item) :Item_int_func(thd, item) {} + const Type_handler *type_handler() const + { + if (unsigned_flag) + return &type_handler_ulong; + return &type_handler_slong; + } + bool fix_length_and_dec() { max_length= 11; return FALSE; } +}; + + +class Item_func_hash: public Item_int_func +{ +public: + Item_func_hash(THD *thd, List<Item> &item): Item_int_func(thd, item) + {} + longlong val_int(); + bool fix_length_and_dec(); + const Type_handler *type_handler() const { return &type_handler_slong; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_hash>(thd, this); } + const char *func_name() const { return "<hash>"; } +}; + +class Item_longlong_func: public Item_int_func +{ +public: + Item_longlong_func(THD *thd): Item_int_func(thd) { } + Item_longlong_func(THD *thd, Item *a): Item_int_func(thd, a) {} + Item_longlong_func(THD *thd, Item *a, Item *b): Item_int_func(thd, a, b) {} + Item_longlong_func(THD *thd, Item *a, Item *b, Item *c): Item_int_func(thd, a, b, c) {} + Item_longlong_func(THD *thd, Item *a, Item *b, Item *c, Item *d): + Item_int_func(thd, a, b, c, d) {} + Item_longlong_func(THD *thd, List<Item> &list): Item_int_func(thd, list) { } + Item_longlong_func(THD *thd, Item_longlong_func *item) :Item_int_func(thd, item) {} + const Type_handler *type_handler() const + { + if (unsigned_flag) + return &type_handler_ulonglong; + return &type_handler_slonglong; + } +}; + + +class Cursor_ref +{ +protected: + LEX_CSTRING m_cursor_name; + uint m_cursor_offset; + class sp_cursor *get_open_cursor_or_error(); + Cursor_ref(const LEX_CSTRING *name, uint offset) + :m_cursor_name(*name), m_cursor_offset(offset) + { } + void print_func(String *str, const char *func_name); +}; + + + +class Item_func_cursor_rowcount: public Item_longlong_func, + public Cursor_ref +{ +public: + Item_func_cursor_rowcount(THD *thd, const LEX_CSTRING *name, uint offset) + :Item_longlong_func(thd), Cursor_ref(name, offset) { maybe_null= true; } + const char *func_name() const { return "%ROWCOUNT"; } + longlong val_int(); + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), arg, VCOL_SESSION_FUNC); + } + void print(String *str, enum_query_type query_type) + { + return Cursor_ref::print_func(str, func_name()); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_cursor_rowcount>(thd, this); } +}; + + + +class Item_func_connection_id :public Item_long_func +{ + longlong value; + +public: + Item_func_connection_id(THD *thd): Item_long_func(thd) { unsigned_flag=1; } + const char *func_name() const { return "connection_id"; } + bool fix_length_and_dec(); + bool fix_fields(THD *thd, Item **ref); + longlong val_int() { DBUG_ASSERT(fixed == 1); return value; } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_SESSION_FUNC); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_connection_id>(thd, this); } +}; + + +class Item_func_signed :public Item_int_func +{ +public: + Item_func_signed(THD *thd, Item *a): Item_int_func(thd, a) + { + unsigned_flag= 0; + } + const char *func_name() const { return "cast_as_signed"; } + const Type_handler *type_handler() const + { + return Type_handler::type_handler_long_or_longlong(max_char_length(), + false); + } + longlong val_int() + { + longlong value= args[0]->val_int_signed_typecast(); + null_value= args[0]->null_value; + return value; + } + void fix_length_and_dec_double() + { + fix_char_length(MAX_BIGINT_WIDTH); + } + void fix_length_and_dec_generic() + { + uint32 char_length= MY_MIN(args[0]->max_char_length(), + MY_INT64_NUM_DECIMAL_DIGITS); + /* + args[0]->max_char_length() can return 0. + Reserve max_length to fit at least one character for one digit, + plus one character for the sign (if signed). + */ + set_if_bigger(char_length, 1U + (unsigned_flag ? 0 : 1)); + fix_char_length(char_length); + } + void fix_length_and_dec_string() + { + /* + For strings, use decimal_int_part() instead of max_char_length(). + This is important for Item_hex_hybrid: + SELECT CAST(0x1FFFFFFFF AS SIGNED); + Length is 5, decimal_int_part() is 13. + */ + uint32 char_length= MY_MIN(args[0]->decimal_int_part(), + MY_INT64_NUM_DECIMAL_DIGITS); + set_if_bigger(char_length, 1U + (unsigned_flag ? 0 : 1)); + fix_char_length(char_length); + } + bool fix_length_and_dec() + { + return args[0]->type_handler()->Item_func_signed_fix_length_and_dec(this); + } + virtual void print(String *str, enum_query_type query_type); + uint decimal_precision() const { return args[0]->decimal_precision(); } + bool need_parentheses_in_default() { return true; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_signed>(thd, this); } +}; + + +class Item_func_unsigned :public Item_func_signed +{ +public: + Item_func_unsigned(THD *thd, Item *a): Item_func_signed(thd, a) + { + unsigned_flag= 1; + } + const char *func_name() const { return "cast_as_unsigned"; } + const Type_handler *type_handler() const + { + if (max_char_length() <= MY_INT32_NUM_DECIMAL_DIGITS - 1) + return &type_handler_ulong; + return &type_handler_ulonglong; + } + longlong val_int() + { + longlong value= args[0]->val_int_unsigned_typecast(); + null_value= args[0]->null_value; + return value; + } + bool fix_length_and_dec() + { + return args[0]->type_handler()->Item_func_unsigned_fix_length_and_dec(this); + } + uint decimal_precision() const { return max_length; } + virtual void print(String *str, enum_query_type query_type); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_unsigned>(thd, this); } +}; + + +class Item_decimal_typecast :public Item_func +{ + my_decimal decimal_value; +public: + Item_decimal_typecast(THD *thd, Item *a, uint len, uint dec) + :Item_func(thd, a) + { + decimals= (uint8) dec; + collation= DTCollation_numeric(); + fix_char_length(my_decimal_precision_to_length_no_truncation(len, dec, + unsigned_flag)); + } + String *val_str(String *str) { return VDec(this).to_string(str); } + double val_real() { return VDec(this).to_double(); } + longlong val_int() { return VDec(this).to_longlong(unsigned_flag); } + my_decimal *val_decimal(my_decimal*); + bool get_date(THD *thd, MYSQL_TIME *to, date_mode_t mode) + { + return decimal_to_datetime_with_warn(thd, VDec(this).ptr(), to, mode, + NULL, NULL); + } + const Type_handler *type_handler() const { return &type_handler_newdecimal; } + void fix_length_and_dec_generic() {} + bool fix_length_and_dec() + { + return + args[0]->type_handler()->Item_decimal_typecast_fix_length_and_dec(this); + } + const char *func_name() const { return "decimal_typecast"; } + virtual void print(String *str, enum_query_type query_type); + bool need_parentheses_in_default() { return true; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_decimal_typecast>(thd, this); } +}; + + +class Item_real_typecast: public Item_real_func +{ +protected: + double val_real_with_truncate(double max_value); +public: + Item_real_typecast(THD *thd, Item *a, uint len, uint dec) + :Item_real_func(thd, a) + { + decimals= (uint8) dec; + max_length= (uint32) len; + } + bool need_parentheses_in_default() { return true; } + void print(String *str, enum_query_type query_type); + void fix_length_and_dec_generic() { maybe_null= 1; } +}; + + +class Item_float_typecast :public Item_real_typecast +{ +public: + Item_float_typecast(THD *thd, Item *a) + :Item_real_typecast(thd, a, MAX_FLOAT_STR_LENGTH, NOT_FIXED_DEC) + { } + const Type_handler *type_handler() const { return &type_handler_float; } + bool fix_length_and_dec() + { + return + args[0]->type_handler()->Item_float_typecast_fix_length_and_dec(this); + } + const char *func_name() const { return "float_typecast"; } + double val_real() + { + return (double) (float) val_real_with_truncate(FLT_MAX); + } + String *val_str(String*str) + { + Float nr(Item_float_typecast::val_real()); + if (null_value) + return 0; + nr.to_string(str, decimals); + return str; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_float_typecast>(thd, this); } +}; + + +class Item_double_typecast :public Item_real_typecast +{ +public: + Item_double_typecast(THD *thd, Item *a, uint len, uint dec): + Item_real_typecast(thd, a, len, dec) + { } + bool fix_length_and_dec() + { + return + args[0]->type_handler()->Item_double_typecast_fix_length_and_dec(this); + } + const char *func_name() const { return "double_typecast"; } + double val_real() { return val_real_with_truncate(DBL_MAX); } + Item *get_copy(THD *thd) + { return get_item_copy<Item_double_typecast>(thd, this); } +}; + + +class Item_func_additive_op :public Item_num_op +{ +public: + Item_func_additive_op(THD *thd, Item *a, Item *b): Item_num_op(thd, a, b) {} + void result_precision(); + bool check_partition_func_processor(void *int_arg) {return FALSE;} + bool check_vcol_func_processor(void *arg) { return FALSE;} +}; + + +class Item_func_plus :public Item_func_additive_op +{ +public: + Item_func_plus(THD *thd, Item *a, Item *b): + Item_func_additive_op(thd, a, b) {} + const char *func_name() const { return "+"; } + enum precedence precedence() const { return ADD_PRECEDENCE; } + bool fix_length_and_dec(); + longlong int_op(); + double real_op(); + my_decimal *decimal_op(my_decimal *); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_plus>(thd, this); } +}; + +class Item_func_minus :public Item_func_additive_op +{ + bool m_depends_on_sql_mode_no_unsigned_subtraction; +public: + Item_func_minus(THD *thd, Item *a, Item *b): + Item_func_additive_op(thd, a, b), + m_depends_on_sql_mode_no_unsigned_subtraction(false) + { } + const char *func_name() const { return "-"; } + enum precedence precedence() const { return ADD_PRECEDENCE; } + Sql_mode_dependency value_depends_on_sql_mode() const; + longlong int_op(); + double real_op(); + my_decimal *decimal_op(my_decimal *); + bool fix_length_and_dec(); + void fix_unsigned_flag(); + void fix_length_and_dec_double() + { + Item_func_additive_op::fix_length_and_dec_double(); + fix_unsigned_flag(); + } + void fix_length_and_dec_decimal() + { + Item_func_additive_op::fix_length_and_dec_decimal(); + fix_unsigned_flag(); + } + void fix_length_and_dec_int() + { + Item_func_additive_op::fix_length_and_dec_int(); + fix_unsigned_flag(); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_minus>(thd, this); } +}; + + +class Item_func_mul :public Item_num_op +{ +public: + Item_func_mul(THD *thd, Item *a, Item *b): + Item_num_op(thd, a, b) {} + const char *func_name() const { return "*"; } + enum precedence precedence() const { return MUL_PRECEDENCE; } + longlong int_op(); + double real_op(); + my_decimal *decimal_op(my_decimal *); + void result_precision(); + bool fix_length_and_dec(); + bool check_partition_func_processor(void *int_arg) {return FALSE;} + bool check_vcol_func_processor(void *arg) { return FALSE;} + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_mul>(thd, this); } +}; + + +class Item_func_div :public Item_num_op +{ +public: + uint prec_increment; + Item_func_div(THD *thd, Item *a, Item *b): Item_num_op(thd, a, b) {} + longlong int_op() { DBUG_ASSERT(0); return 0; } + double real_op(); + my_decimal *decimal_op(my_decimal *); + const char *func_name() const { return "/"; } + enum precedence precedence() const { return MUL_PRECEDENCE; } + bool fix_length_and_dec(); + void fix_length_and_dec_double(); + void fix_length_and_dec_int(); + void result_precision(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_div>(thd, this); } +}; + + +class Item_func_int_div :public Item_int_func +{ +public: + Item_func_int_div(THD *thd, Item *a, Item *b): Item_int_func(thd, a, b) + {} + longlong val_int(); + const char *func_name() const { return "DIV"; } + enum precedence precedence() const { return MUL_PRECEDENCE; } + const Type_handler *type_handler() const + { return type_handler_long_or_longlong(); } + bool fix_length_and_dec(); + void print(String *str, enum_query_type query_type) + { + print_op(str, query_type); + } + + bool check_partition_func_processor(void *int_arg) {return FALSE;} + bool check_vcol_func_processor(void *arg) { return FALSE;} + bool need_parentheses_in_default() { return true; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_int_div>(thd, this); } +}; + + +class Item_func_mod :public Item_num_op +{ +public: + Item_func_mod(THD *thd, Item *a, Item *b): Item_num_op(thd, a, b) {} + longlong int_op(); + double real_op(); + my_decimal *decimal_op(my_decimal *); + const char *func_name() const { return "MOD"; } + enum precedence precedence() const { return MUL_PRECEDENCE; } + void result_precision(); + bool fix_length_and_dec(); + void fix_length_and_dec_double() + { + Item_num_op::fix_length_and_dec_double(); + unsigned_flag= args[0]->unsigned_flag; + } + void fix_length_and_dec_decimal() + { + result_precision(); + fix_decimals(); + } + void fix_length_and_dec_int() + { + result_precision(); + DBUG_ASSERT(decimals == 0); + set_handler(type_handler_long_or_longlong()); + } + bool check_partition_func_processor(void *int_arg) {return FALSE;} + bool check_vcol_func_processor(void *arg) { return FALSE;} + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_mod>(thd, this); } +}; + + +class Item_func_neg :public Item_func_num1 +{ +public: + Item_func_neg(THD *thd, Item *a): Item_func_num1(thd, a) {} + double real_op(); + longlong int_op(); + my_decimal *decimal_op(my_decimal *); + const char *func_name() const { return "-"; } + enum Functype functype() const { return NEG_FUNC; } + enum precedence precedence() const { return NEG_PRECEDENCE; } + void print(String *str, enum_query_type query_type) + { + str->append(func_name()); + args[0]->print_parenthesised(str, query_type, precedence()); + } + void fix_length_and_dec_int(); + void fix_length_and_dec_double(); + void fix_length_and_dec_decimal(); + bool fix_length_and_dec(); + uint decimal_precision() const { return args[0]->decimal_precision(); } + bool need_parentheses_in_default() { return true; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_neg>(thd, this); } +}; + + +class Item_func_abs :public Item_func_num1 +{ +public: + Item_func_abs(THD *thd, Item *a): Item_func_num1(thd, a) {} + double real_op(); + longlong int_op(); + my_decimal *decimal_op(my_decimal *); + const char *func_name() const { return "abs"; } + void fix_length_and_dec_int(); + void fix_length_and_dec_double(); + void fix_length_and_dec_decimal(); + bool fix_length_and_dec(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_abs>(thd, this); } +}; + +// A class to handle logarithmic and trigonometric functions + +class Item_dec_func :public Item_real_func +{ + bool check_arguments() const + { return check_argument_types_can_return_real(0, arg_count); } + public: + Item_dec_func(THD *thd, Item *a): Item_real_func(thd, a) {} + Item_dec_func(THD *thd, Item *a, Item *b): Item_real_func(thd, a, b) {} + bool fix_length_and_dec() + { + decimals=NOT_FIXED_DEC; max_length=float_length(decimals); + maybe_null=1; + return FALSE; + } +}; + +class Item_func_exp :public Item_dec_func +{ +public: + Item_func_exp(THD *thd, Item *a): Item_dec_func(thd, a) {} + double val_real(); + const char *func_name() const { return "exp"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_exp>(thd, this); } +}; + + +class Item_func_ln :public Item_dec_func +{ +public: + Item_func_ln(THD *thd, Item *a): Item_dec_func(thd, a) {} + double val_real(); + const char *func_name() const { return "ln"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_ln>(thd, this); } +}; + + +class Item_func_log :public Item_dec_func +{ +public: + Item_func_log(THD *thd, Item *a): Item_dec_func(thd, a) {} + Item_func_log(THD *thd, Item *a, Item *b): Item_dec_func(thd, a, b) {} + double val_real(); + const char *func_name() const { return "log"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_log>(thd, this); } +}; + + +class Item_func_log2 :public Item_dec_func +{ +public: + Item_func_log2(THD *thd, Item *a): Item_dec_func(thd, a) {} + double val_real(); + const char *func_name() const { return "log2"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_log2>(thd, this); } +}; + + +class Item_func_log10 :public Item_dec_func +{ +public: + Item_func_log10(THD *thd, Item *a): Item_dec_func(thd, a) {} + double val_real(); + const char *func_name() const { return "log10"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_log10>(thd, this); } +}; + + +class Item_func_sqrt :public Item_dec_func +{ +public: + Item_func_sqrt(THD *thd, Item *a): Item_dec_func(thd, a) {} + double val_real(); + const char *func_name() const { return "sqrt"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_sqrt>(thd, this); } +}; + + +class Item_func_pow :public Item_dec_func +{ +public: + Item_func_pow(THD *thd, Item *a, Item *b): Item_dec_func(thd, a, b) {} + double val_real(); + const char *func_name() const { return "pow"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_pow>(thd, this); } +}; + + +class Item_func_acos :public Item_dec_func +{ +public: + Item_func_acos(THD *thd, Item *a): Item_dec_func(thd, a) {} + double val_real(); + const char *func_name() const { return "acos"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_acos>(thd, this); } +}; + +class Item_func_asin :public Item_dec_func +{ +public: + Item_func_asin(THD *thd, Item *a): Item_dec_func(thd, a) {} + double val_real(); + const char *func_name() const { return "asin"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_asin>(thd, this); } +}; + +class Item_func_atan :public Item_dec_func +{ +public: + Item_func_atan(THD *thd, Item *a): Item_dec_func(thd, a) {} + Item_func_atan(THD *thd, Item *a, Item *b): Item_dec_func(thd, a, b) {} + double val_real(); + const char *func_name() const { return "atan"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_atan>(thd, this); } +}; + +class Item_func_cos :public Item_dec_func +{ +public: + Item_func_cos(THD *thd, Item *a): Item_dec_func(thd, a) {} + double val_real(); + const char *func_name() const { return "cos"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_cos>(thd, this); } +}; + +class Item_func_sin :public Item_dec_func +{ +public: + Item_func_sin(THD *thd, Item *a): Item_dec_func(thd, a) {} + double val_real(); + const char *func_name() const { return "sin"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_sin>(thd, this); } +}; + +class Item_func_tan :public Item_dec_func +{ +public: + Item_func_tan(THD *thd, Item *a): Item_dec_func(thd, a) {} + double val_real(); + const char *func_name() const { return "tan"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_tan>(thd, this); } +}; + +class Item_func_cot :public Item_dec_func +{ +public: + Item_func_cot(THD *thd, Item *a): Item_dec_func(thd, a) {} + double val_real(); + const char *func_name() const { return "cot"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_cot>(thd, this); } +}; + + +class Item_func_int_val :public Item_func_hybrid_field_type +{ +public: + Item_func_int_val(THD *thd, Item *a): Item_func_hybrid_field_type(thd, a) {} + bool check_partition_func_processor(void *int_arg) { return FALSE; } + bool check_vcol_func_processor(void *arg) { return FALSE; } + virtual decimal_round_mode round_mode() const= 0; + void fix_length_and_dec_double(); + void fix_length_and_dec_int_or_decimal(); + void fix_length_and_dec_time() + { + fix_attributes_time(0); + set_handler(&type_handler_time2); + } + void fix_length_and_dec_datetime() + { + fix_attributes_datetime(0); + set_handler(&type_handler_datetime2); + maybe_null= true; // E.g. CEILING(TIMESTAMP'0000-01-01 23:59:59.9') + } + bool fix_length_and_dec(); + String *str_op(String *str) { DBUG_ASSERT(0); return 0; } + bool native_op(THD *thd, Native *to) + { + DBUG_ASSERT(0); + return true; + } +}; + + +class Item_func_ceiling :public Item_func_int_val +{ +public: + Item_func_ceiling(THD *thd, Item *a): Item_func_int_val(thd, a) {} + const char *func_name() const { return "ceiling"; } + decimal_round_mode round_mode() const { return CEILING; } + longlong int_op(); + double real_op(); + my_decimal *decimal_op(my_decimal *); + bool date_op(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate); + bool time_op(THD *thd, MYSQL_TIME *ltime); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_ceiling>(thd, this); } +}; + + +class Item_func_floor :public Item_func_int_val +{ +public: + Item_func_floor(THD *thd, Item *a): Item_func_int_val(thd, a) {} + const char *func_name() const { return "floor"; } + decimal_round_mode round_mode() const { return FLOOR; } + longlong int_op(); + double real_op(); + my_decimal *decimal_op(my_decimal *); + bool date_op(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate); + bool time_op(THD *thd, MYSQL_TIME *ltime); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_floor>(thd, this); } +}; + +/* This handles round and truncate */ + +class Item_func_round :public Item_func_hybrid_field_type +{ + bool truncate; + void fix_length_and_dec_decimal(uint decimals_to_set); + void fix_length_and_dec_double(uint decimals_to_set); + bool test_if_length_can_increase(); +public: + Item_func_round(THD *thd, Item *a, Item *b, bool trunc_arg) + :Item_func_hybrid_field_type(thd, a, b), truncate(trunc_arg) {} + const char *func_name() const { return truncate ? "truncate" : "round"; } + double real_op(); + longlong int_op(); + my_decimal *decimal_op(my_decimal *); + bool date_op(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate); + bool time_op(THD *thd, MYSQL_TIME *ltime); + bool native_op(THD *thd, Native *to) + { + DBUG_ASSERT(0); + return true; + } + String *str_op(String *str) + { + DBUG_ASSERT(0); + return NULL; + } + void fix_arg_decimal(); + void fix_arg_int(const Type_handler *preferred, + const Type_std_attributes *preferred_attributes, + bool use_decimal_on_length_increase); + void fix_arg_hex_hybrid(); + void fix_arg_double(); + void fix_arg_time(); + void fix_arg_datetime(); + void fix_arg_temporal(const Type_handler *h, uint int_part_length); + bool fix_length_and_dec() + { + /* + We don't want to translate ENUM/SET to CHAR here. + So let's real_type_handler(), not type_handler(). + */ + return args[0]->real_type_handler()->Item_func_round_fix_length_and_dec(this); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_round>(thd, this); } +}; + + +class Item_func_rand :public Item_real_func +{ + struct my_rnd_struct *rand; + bool first_eval; // TRUE if val_real() is called 1st time + bool check_arguments() const + { return check_argument_types_can_return_int(0, arg_count); } + void seed_random (Item * val); +public: + Item_func_rand(THD *thd, Item *a): + Item_real_func(thd, a), rand(0), first_eval(TRUE) {} + Item_func_rand(THD *thd): Item_real_func(thd) {} + double val_real(); + const char *func_name() const { return "rand"; } + bool const_item() const { return 0; } + void update_used_tables(); + bool fix_fields(THD *thd, Item **ref); + void cleanup() { first_eval= TRUE; Item_real_func::cleanup(); } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, + VCOL_NON_DETERMINISTIC); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_rand>(thd, this); } +}; + + +class Item_func_sign :public Item_long_func +{ + bool check_arguments() const + { return args[0]->check_type_can_return_real(func_name()); } +public: + Item_func_sign(THD *thd, Item *a): Item_long_func(thd, a) {} + const char *func_name() const { return "sign"; } + uint decimal_precision() const { return 1; } + bool fix_length_and_dec() { fix_char_length(2); return FALSE; } + longlong val_int(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_sign>(thd, this); } +}; + + +class Item_func_units :public Item_real_func +{ + char *name; + double mul,add; + bool check_arguments() const + { return check_argument_types_can_return_real(0, arg_count); } +public: + Item_func_units(THD *thd, char *name_arg, Item *a, double mul_arg, + double add_arg): + Item_real_func(thd, a), name(name_arg), mul(mul_arg), add(add_arg) {} + double val_real(); + const char *func_name() const { return name; } + bool fix_length_and_dec() + { + decimals= NOT_FIXED_DEC; + max_length= float_length(decimals); + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_units>(thd, this); } +}; + + +/** + Item_func_min_max does not derive from Item_func_hybrid_field_type + because the way how its methods val_xxx() and get_date() work depend + not only by its arguments, but also on the context in which + LEAST() and GREATEST() appear. + For example, using Item_func_min_max in a CAST like this: + CAST(LEAST('11','2') AS SIGNED) + forces Item_func_min_max to compare the arguments as numbers rather + than strings. + Perhaps this should be changed eventually (see MDEV-5893). +*/ +class Item_func_min_max :public Item_hybrid_func +{ + String tmp_value; + int cmp_sign; +protected: + bool check_arguments() const + { + return false; // Checked by aggregate_for_min_max() + } + bool fix_attributes(Item **item, uint nitems); +public: + Item_func_min_max(THD *thd, List<Item> &list, int cmp_sign_arg): + Item_hybrid_func(thd, list), cmp_sign(cmp_sign_arg) + {} + String *val_str_native(String *str); + double val_real_native(); + longlong val_int_native(); + my_decimal *val_decimal_native(my_decimal *); + bool get_date_native(THD *thd, MYSQL_TIME *res, date_mode_t fuzzydate); + bool get_time_native(THD *thd, MYSQL_TIME *res); + + double val_real() + { + DBUG_ASSERT(fixed); + return Item_func_min_max::type_handler()-> + Item_func_min_max_val_real(this); + } + longlong val_int() + { + DBUG_ASSERT(fixed); + return Item_func_min_max::type_handler()-> + Item_func_min_max_val_int(this); + } + String *val_str(String *str) + { + DBUG_ASSERT(fixed); + return Item_func_min_max::type_handler()-> + Item_func_min_max_val_str(this, str); + } + my_decimal *val_decimal(my_decimal *dec) + { + DBUG_ASSERT(fixed); + return Item_func_min_max::type_handler()-> + Item_func_min_max_val_decimal(this, dec); + } + bool get_date(THD *thd, MYSQL_TIME *res, date_mode_t fuzzydate) + { + DBUG_ASSERT(fixed); + return Item_func_min_max::type_handler()-> + Item_func_min_max_get_date(thd, this, res, fuzzydate); + } + bool val_native(THD *thd, Native *to); + void aggregate_attributes_real(Item **items, uint nitems) + { + /* + Aggregating attributes for the double data type for LEAST/GREATEST + is almost the same with aggregating for CASE-alike hybrid functions, + (CASE..THEN, COALESCE, IF, etc). + There is one notable difference though, when a numeric argument is mixed + with a string argument: + - CASE-alike functions return a string data type in such cases + COALESCE(10,'x') -> VARCHAR(2) = '10' + - LEAST/GREATEST returns double: + GREATEST(10,'10e4') -> DOUBLE = 100000 + As the string argument can represent a number in the scientific notation, + like in the example above, max_length of the result can be longer than + max_length of the arguments. To handle this properly, max_length is + additionally assigned to the result of float_length(decimals). + */ + Item_func::aggregate_attributes_real(items, nitems); + max_length= float_length(decimals); + } + bool fix_length_and_dec() + { + if (aggregate_for_min_max(func_name(), args, arg_count)) + return true; + fix_attributes(args, arg_count); + return false; + } +}; + +class Item_func_min :public Item_func_min_max +{ +public: + Item_func_min(THD *thd, List<Item> &list): Item_func_min_max(thd, list, 1) {} + const char *func_name() const { return "least"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_min>(thd, this); } +}; + +class Item_func_max :public Item_func_min_max +{ +public: + Item_func_max(THD *thd, List<Item> &list): Item_func_min_max(thd, list, -1) {} + const char *func_name() const { return "greatest"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_max>(thd, this); } +}; + + +/* + Objects of this class are used for ROLLUP queries to wrap up + each constant item referred to in GROUP BY list. +*/ + +class Item_func_rollup_const :public Item_func +{ +public: + Item_func_rollup_const(THD *thd, Item *a): Item_func(thd, a) + { + name= a->name; + } + double val_real() { return val_real_from_item(args[0]); } + longlong val_int() { return val_int_from_item(args[0]); } + String *val_str(String *str) { return val_str_from_item(args[0], str); } + bool val_native(THD *thd, Native *to) + { return val_native_from_item(thd, args[0], to); } + my_decimal *val_decimal(my_decimal *dec) + { return val_decimal_from_item(args[0], dec); } + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) + { return get_date_from_item(thd, args[0], ltime, fuzzydate); } + const char *func_name() const { return "rollup_const"; } + bool const_item() const { return 0; } + const Type_handler *type_handler() const { return args[0]->type_handler(); } + bool fix_length_and_dec() + { + Type_std_attributes::set(*args[0]); + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_rollup_const>(thd, this); } +}; + + +class Item_long_func_length: public Item_long_func +{ + bool check_arguments() const + { return args[0]->check_type_can_return_str(func_name()); } +public: + Item_long_func_length(THD *thd, Item *a): Item_long_func(thd, a) {} + bool fix_length_and_dec() { max_length=10; return FALSE; } +}; + + +class Item_func_octet_length :public Item_long_func_length +{ + String value; +public: + Item_func_octet_length(THD *thd, Item *a): Item_long_func_length(thd, a) {} + longlong val_int(); + const char *func_name() const { return "octet_length"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_octet_length>(thd, this); } +}; + +class Item_func_bit_length :public Item_longlong_func +{ + String value; +public: + Item_func_bit_length(THD *thd, Item *a): Item_longlong_func(thd, a) {} + bool fix_length_and_dec() + { + max_length= 11; // 0x100000000*8 = 34,359,738,368 + return FALSE; + } + longlong val_int(); + const char *func_name() const { return "bit_length"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_bit_length>(thd, this); } +}; + +class Item_func_char_length :public Item_long_func_length +{ + String value; +public: + Item_func_char_length(THD *thd, Item *a): Item_long_func_length(thd, a) {} + longlong val_int(); + const char *func_name() const { return "char_length"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_char_length>(thd, this); } +}; + +class Item_func_coercibility :public Item_long_func +{ + bool check_arguments() const + { return args[0]->check_type_can_return_str(func_name()); } +public: + Item_func_coercibility(THD *thd, Item *a): Item_long_func(thd, a) {} + longlong val_int(); + const char *func_name() const { return "coercibility"; } + bool fix_length_and_dec() { max_length=10; maybe_null= 0; return FALSE; } + bool eval_not_null_tables(void *) + { + not_null_tables_cache= 0; + return false; + } + bool find_not_null_fields(table_map allowed) + { + return false; + } + Item* propagate_equal_fields(THD *thd, const Context &ctx, COND_EQUAL *cond) + { return this; } + bool const_item() const { return true; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_coercibility>(thd, this); } +}; + + +/* + In the corner case LOCATE could return (4,294,967,296 + 1), + which would not fit into Item_long_func range. + But string lengths are limited with max_allowed_packet, + which cannot be bigger than 1024*1024*1024. +*/ +class Item_func_locate :public Item_long_func +{ + bool check_arguments() const + { + return check_argument_types_can_return_str(0, 2) || + (arg_count > 2 && args[2]->check_type_can_return_int(func_name())); + } + String value1,value2; + DTCollation cmp_collation; +public: + Item_func_locate(THD *thd, Item *a, Item *b) + :Item_long_func(thd, a, b) {} + Item_func_locate(THD *thd, Item *a, Item *b, Item *c) + :Item_long_func(thd, a, b, c) {} + const char *func_name() const { return "locate"; } + longlong val_int(); + bool fix_length_and_dec() + { + max_length= MY_INT32_NUM_DECIMAL_DIGITS; + return agg_arg_charsets_for_comparison(cmp_collation, args, 2); + } + virtual void print(String *str, enum_query_type query_type); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_locate>(thd, this); } +}; + + +class Item_func_field :public Item_long_func +{ + String value,tmp; + Item_result cmp_type; + DTCollation cmp_collation; +public: + Item_func_field(THD *thd, List<Item> &list): Item_long_func(thd, list) {} + longlong val_int(); + const char *func_name() const { return "field"; } + bool fix_length_and_dec(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_field>(thd, this); } +}; + + +class Item_func_ascii :public Item_long_func +{ + bool check_arguments() const + { return check_argument_types_can_return_str(0, arg_count); } + String value; +public: + Item_func_ascii(THD *thd, Item *a): Item_long_func(thd, a) {} + longlong val_int(); + const char *func_name() const { return "ascii"; } + bool fix_length_and_dec() { max_length=3; return FALSE; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_ascii>(thd, this); } +}; + +class Item_func_ord :public Item_long_func +{ + bool check_arguments() const + { return args[0]->check_type_can_return_str(func_name()); } + String value; +public: + Item_func_ord(THD *thd, Item *a): Item_long_func(thd, a) {} + bool fix_length_and_dec() { fix_char_length(7); return FALSE; } + longlong val_int(); + const char *func_name() const { return "ord"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_ord>(thd, this); } +}; + +class Item_func_find_in_set :public Item_long_func +{ + bool check_arguments() const + { return check_argument_types_can_return_str(0, 2); } + String value,value2; + uint enum_value; + ulonglong enum_bit; + DTCollation cmp_collation; +public: + Item_func_find_in_set(THD *thd, Item *a, Item *b): + Item_long_func(thd, a, b), enum_value(0) {} + longlong val_int(); + const char *func_name() const { return "find_in_set"; } + bool fix_length_and_dec(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_find_in_set>(thd, this); } +}; + +/* Base class for all bit functions: '~', '|', '^', '&', '>>', '<<' */ + +class Item_func_bit_operator: public Item_handled_func +{ + bool check_arguments() const + { return check_argument_types_can_return_int(0, arg_count); } +protected: + bool fix_length_and_dec_op1_std(const Handler *ha_int, const Handler *ha_dec) + { + set_func_handler(args[0]->cmp_type() == INT_RESULT ? ha_int : ha_dec); + return m_func_handler->fix_length_and_dec(this); + } + bool fix_length_and_dec_op2_std(const Handler *ha_int, const Handler *ha_dec) + { + set_func_handler(args[0]->cmp_type() == INT_RESULT && + args[1]->cmp_type() == INT_RESULT ? ha_int : ha_dec); + return m_func_handler->fix_length_and_dec(this); + } +public: + Item_func_bit_operator(THD *thd, Item *a) + :Item_handled_func(thd, a) {} + Item_func_bit_operator(THD *thd, Item *a, Item *b) + :Item_handled_func(thd, a, b) {} + void print(String *str, enum_query_type query_type) + { + print_op(str, query_type); + } + bool need_parentheses_in_default() { return true; } +}; + +class Item_func_bit_or :public Item_func_bit_operator +{ +public: + Item_func_bit_or(THD *thd, Item *a, Item *b) + :Item_func_bit_operator(thd, a, b) {} + bool fix_length_and_dec(); + const char *func_name() const { return "|"; } + enum precedence precedence() const { return BITOR_PRECEDENCE; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_bit_or>(thd, this); } +}; + +class Item_func_bit_and :public Item_func_bit_operator +{ +public: + Item_func_bit_and(THD *thd, Item *a, Item *b) + :Item_func_bit_operator(thd, a, b) {} + bool fix_length_and_dec(); + const char *func_name() const { return "&"; } + enum precedence precedence() const { return BITAND_PRECEDENCE; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_bit_and>(thd, this); } +}; + +class Item_func_bit_count :public Item_handled_func +{ + bool check_arguments() const + { return args[0]->check_type_can_return_int(func_name()); } +public: + Item_func_bit_count(THD *thd, Item *a): Item_handled_func(thd, a) {} + const char *func_name() const { return "bit_count"; } + bool fix_length_and_dec(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_bit_count>(thd, this); } +}; + +class Item_func_shift_left :public Item_func_bit_operator +{ +public: + Item_func_shift_left(THD *thd, Item *a, Item *b) + :Item_func_bit_operator(thd, a, b) {} + bool fix_length_and_dec(); + const char *func_name() const { return "<<"; } + enum precedence precedence() const { return SHIFT_PRECEDENCE; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_shift_left>(thd, this); } +}; + +class Item_func_shift_right :public Item_func_bit_operator +{ +public: + Item_func_shift_right(THD *thd, Item *a, Item *b) + :Item_func_bit_operator(thd, a, b) {} + bool fix_length_and_dec(); + const char *func_name() const { return ">>"; } + enum precedence precedence() const { return SHIFT_PRECEDENCE; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_shift_right>(thd, this); } +}; + +class Item_func_bit_neg :public Item_func_bit_operator +{ +public: + Item_func_bit_neg(THD *thd, Item *a): Item_func_bit_operator(thd, a) {} + bool fix_length_and_dec(); + const char *func_name() const { return "~"; } + enum precedence precedence() const { return NEG_PRECEDENCE; } + void print(String *str, enum_query_type query_type) + { + str->append(func_name()); + args[0]->print_parenthesised(str, query_type, precedence()); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_bit_neg>(thd, this); } +}; + + +class Item_func_last_insert_id :public Item_longlong_func +{ + bool check_arguments() const + { return check_argument_types_can_return_int(0, arg_count); } +public: + Item_func_last_insert_id(THD *thd): Item_longlong_func(thd) {} + Item_func_last_insert_id(THD *thd, Item *a): Item_longlong_func(thd, a) {} + longlong val_int(); + const char *func_name() const { return "last_insert_id"; } + bool fix_length_and_dec() + { + unsigned_flag= true; + if (arg_count) + max_length= args[0]->max_length; + return FALSE; + } + bool fix_fields(THD *thd, Item **ref); + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_last_insert_id>(thd, this); } +}; + + +class Item_func_benchmark :public Item_long_func +{ + bool check_arguments() const + { + return args[0]->check_type_can_return_int(func_name()) || + args[1]->check_type_scalar(func_name()); + } +public: + Item_func_benchmark(THD *thd, Item *count_expr, Item *expr): + Item_long_func(thd, count_expr, expr) + {} + longlong val_int(); + const char *func_name() const { return "benchmark"; } + bool fix_length_and_dec() { max_length=1; maybe_null=0; return FALSE; } + virtual void print(String *str, enum_query_type query_type); + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_benchmark>(thd, this); } +}; + + +void item_func_sleep_init(void); +void item_func_sleep_free(void); + +class Item_func_sleep :public Item_long_func +{ + bool check_arguments() const + { return args[0]->check_type_can_return_real(func_name()); } +public: + Item_func_sleep(THD *thd, Item *a): Item_long_func(thd, a) {} + bool fix_length_and_dec() { fix_char_length(1); return FALSE; } + bool const_item() const { return 0; } + const char *func_name() const { return "sleep"; } + table_map used_tables() const + { + return used_tables_cache | RAND_TABLE_BIT; + } + bool is_expensive() { return 1; } + longlong val_int(); + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_sleep>(thd, this); } +}; + + + +#ifdef HAVE_DLOPEN + +class Item_udf_func :public Item_func +{ + /** + Mark "this" as non-deterministic if it uses no tables + and is not a constant at the same time. + */ + void set_non_deterministic_if_needed() + { + if (!const_item_cache && !used_tables_cache) + used_tables_cache= RAND_TABLE_BIT; + } +protected: + udf_handler udf; + bool is_expensive_processor(void *arg) { return TRUE; } + + class VDec_udf: public Dec_ptr_and_buffer + { + public: + VDec_udf(Item_udf_func *func, udf_handler *udf) + { + my_bool tmp_null_value; + m_ptr= udf->val_decimal(&tmp_null_value, &m_buffer); + DBUG_ASSERT(is_null() == (tmp_null_value != 0)); + func->null_value= is_null(); + } + }; + +public: + Item_udf_func(THD *thd, udf_func *udf_arg): + Item_func(thd), udf(udf_arg) {} + Item_udf_func(THD *thd, udf_func *udf_arg, List<Item> &list): + Item_func(thd, list), udf(udf_arg) {} + const char *func_name() const { return udf.name(); } + enum Functype functype() const { return UDF_FUNC; } + bool fix_fields(THD *thd, Item **ref) + { + DBUG_ASSERT(fixed == 0); + bool res= udf.fix_fields(thd, this, arg_count, args); + set_non_deterministic_if_needed(); + fixed= 1; + return res; + } + void fix_num_length_and_dec(); + void update_used_tables() + { + /* + TODO: Make a member in UDF_INIT and return if a UDF is deterministic or + not. + Currently UDF_INIT has a member (const_item) that is an in/out + parameter to the init() call. + The code in udf_handler::fix_fields also duplicates the arguments + handling code in Item_func::fix_fields(). + + The lack of information if a UDF is deterministic makes writing + a correct update_used_tables() for UDFs impossible. + One solution to this would be : + - Add a is_deterministic member of UDF_INIT + - (optionally) deprecate the const_item member of UDF_INIT + - Take away the duplicate code from udf_handler::fix_fields() and + make Item_udf_func call Item_func::fix_fields() to process its + arguments as for any other function. + - Store the deterministic flag returned by <udf>_init into the + udf_handler. + - Don't implement Item_udf_func::fix_fields, implement + Item_udf_func::fix_length_and_dec() instead (similar to non-UDF + functions). + - Override Item_func::update_used_tables to call + Item_func::update_used_tables() and add a RAND_TABLE_BIT to the + result of Item_func::update_used_tables() if the UDF is + non-deterministic. + - (optionally) rename RAND_TABLE_BIT to NONDETERMINISTIC_BIT to + better describe its usage. + + The above would require a change of the UDF API. + Until that change is done here's how the current code works: + We call Item_func::update_used_tables() only when we know that + the function depends on real non-const tables and is deterministic. + This can be done only because we know that the optimizer will + call update_used_tables() only when there's possibly a new const + table. So update_used_tables() can only make a Item_func more + constant than it is currently. + That's why we don't need to do anything if a function is guaranteed + to return non-constant (it's non-deterministic) or is already a + const. + */ + if ((used_tables_cache & ~PSEUDO_TABLE_BITS) && + !(used_tables_cache & RAND_TABLE_BIT)) + { + Item_func::update_used_tables(); + set_non_deterministic_if_needed(); + } + } + void cleanup(); + bool eval_not_null_tables(void *opt_arg) + { + not_null_tables_cache= 0; + return 0; + } + bool find_not_null_fields(table_map allowed) + { + return false; + } + bool is_expensive() { return 1; } + virtual void print(String *str, enum_query_type query_type); + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_NON_DETERMINISTIC); + } + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) + { + return type_handler()->Item_get_date_with_warn(thd, this, ltime, fuzzydate); + } + bool excl_dep_on_grouping_fields(st_select_lex *sel) + { return false; } +}; + + +class Item_func_udf_float :public Item_udf_func +{ + public: + Item_func_udf_float(THD *thd, udf_func *udf_arg): + Item_udf_func(thd, udf_arg) {} + Item_func_udf_float(THD *thd, udf_func *udf_arg, + List<Item> &list): + Item_udf_func(thd, udf_arg, list) {} + longlong val_int() + { + DBUG_ASSERT(fixed == 1); + return Converter_double_to_longlong(Item_func_udf_float::val_real(), + unsigned_flag).result(); + } + my_decimal *val_decimal(my_decimal *dec_buf) + { + double res=val_real(); + if (null_value) + return NULL; + double2my_decimal(E_DEC_FATAL_ERROR, res, dec_buf); + return dec_buf; + } + double val_real(); + String *val_str(String *str); + const Type_handler *type_handler() const { return &type_handler_double; } + bool fix_length_and_dec() { fix_num_length_and_dec(); return FALSE; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_udf_float>(thd, this); } +}; + + +class Item_func_udf_int :public Item_udf_func +{ +public: + Item_func_udf_int(THD *thd, udf_func *udf_arg): + Item_udf_func(thd, udf_arg) {} + Item_func_udf_int(THD *thd, udf_func *udf_arg, + List<Item> &list): + Item_udf_func(thd, udf_arg, list) {} + longlong val_int(); + double val_real() { return (double) Item_func_udf_int::val_int(); } + my_decimal *val_decimal(my_decimal *decimal_value) + { + return val_decimal_from_int(decimal_value); + } + String *val_str(String *str); + const Type_handler *type_handler() const + { + if (unsigned_flag) + return &type_handler_ulonglong; + return &type_handler_slonglong; + } + bool fix_length_and_dec() { decimals= 0; max_length= 21; return FALSE; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_udf_int>(thd, this); } +}; + + +class Item_func_udf_decimal :public Item_udf_func +{ +public: + Item_func_udf_decimal(THD *thd, udf_func *udf_arg): + Item_udf_func(thd, udf_arg) {} + Item_func_udf_decimal(THD *thd, udf_func *udf_arg, List<Item> &list): + Item_udf_func(thd, udf_arg, list) {} + longlong val_int() + { + return VDec_udf(this, &udf).to_longlong(unsigned_flag); + } + double val_real() + { + return VDec_udf(this, &udf).to_double(); + } + my_decimal *val_decimal(my_decimal *); + String *val_str(String *str) + { + return VDec_udf(this, &udf).to_string_round(str, decimals); + } + const Type_handler *type_handler() const { return &type_handler_newdecimal; } + bool fix_length_and_dec() { fix_num_length_and_dec(); return FALSE; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_udf_decimal>(thd, this); } +}; + + +class Item_func_udf_str :public Item_udf_func +{ +public: + Item_func_udf_str(THD *thd, udf_func *udf_arg): + Item_udf_func(thd, udf_arg) {} + Item_func_udf_str(THD *thd, udf_func *udf_arg, List<Item> &list): + Item_udf_func(thd, udf_arg, list) {} + String *val_str(String *); + double val_real() + { + int err_not_used; + char *end_not_used; + String *res; + res= val_str(&str_value); + return res ? res->charset()->strntod((char*) res->ptr(), res->length(), + &end_not_used, &err_not_used) : 0.0; + } + longlong val_int() + { + int err_not_used; + String *res; res=val_str(&str_value); + return res ? res->charset()->strntoll(res->ptr(),res->length(),10, + (char**) 0, &err_not_used) : (longlong) 0; + } + my_decimal *val_decimal(my_decimal *dec_buf) + { + String *res=val_str(&str_value); + if (!res) + return NULL; + string2my_decimal(E_DEC_FATAL_ERROR, res, dec_buf); + return dec_buf; + } + const Type_handler *type_handler() const { return string_type_handler(); } + bool fix_length_and_dec(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_udf_str>(thd, this); } +}; + +#else /* Dummy functions to get yy_*.cc files compiled */ + +class Item_func_udf_float :public Item_real_func +{ + public: + Item_func_udf_float(THD *thd, udf_func *udf_arg): + Item_real_func(thd) {} + Item_func_udf_float(THD *thd, udf_func *udf_arg, List<Item> &list): + Item_real_func(thd, list) {} + double val_real() { DBUG_ASSERT(fixed == 1); return 0.0; } +}; + + +class Item_func_udf_int :public Item_int_func +{ +public: + Item_func_udf_int(THD *thd, udf_func *udf_arg): + Item_int_func(thd) {} + Item_func_udf_int(THD *thd, udf_func *udf_arg, List<Item> &list): + Item_int_func(thd, list) {} + const Type_handler *type_handler() const { return &type_handler_slonglong; } + longlong val_int() { DBUG_ASSERT(fixed == 1); return 0; } +}; + + +class Item_func_udf_decimal :public Item_int_func +{ +public: + Item_func_udf_decimal(THD *thd, udf_func *udf_arg): + Item_int_func(thd) {} + Item_func_udf_decimal(THD *thd, udf_func *udf_arg, List<Item> &list): + Item_int_func(thd, list) {} + const Type_handler *type_handler() const { return &type_handler_slonglong; } + my_decimal *val_decimal(my_decimal *) { DBUG_ASSERT(fixed == 1); return 0; } +}; + + +class Item_func_udf_str :public Item_func +{ +public: + Item_func_udf_str(THD *thd, udf_func *udf_arg): + Item_func(thd) {} + Item_func_udf_str(THD *thd, udf_func *udf_arg, List<Item> &list): + Item_func(thd, list) {} + String *val_str(String *) + { DBUG_ASSERT(fixed == 1); null_value=1; return 0; } + double val_real() { DBUG_ASSERT(fixed == 1); null_value= 1; return 0.0; } + longlong val_int() { DBUG_ASSERT(fixed == 1); null_value=1; return 0; } + bool fix_length_and_dec() { maybe_null=1; max_length=0; return FALSE; } +}; + +#endif /* HAVE_DLOPEN */ + +void mysql_ull_cleanup(THD *thd); +void mysql_ull_set_explicit_lock_duration(THD *thd); + + +class Item_func_lock :public Item_long_func +{ + public: + Item_func_lock(THD *thd): Item_long_func(thd) { } + Item_func_lock(THD *thd, Item *a): Item_long_func(thd, a) {} + Item_func_lock(THD *thd, Item *a, Item *b): Item_long_func(thd, a, b) {} + table_map used_tables() const + { + return used_tables_cache | RAND_TABLE_BIT; + } + bool const_item() const { return 0; } + bool is_expensive() { return 1; } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } +}; + + +class Item_func_get_lock final :public Item_func_lock +{ + bool check_arguments() const + { + return args[0]->check_type_general_purpose_string(func_name()) || + args[1]->check_type_can_return_real(func_name()); + } + String value; + public: + Item_func_get_lock(THD *thd, Item *a, Item *b) :Item_func_lock(thd, a, b) {} + longlong val_int() final; + const char *func_name() const final { return "get_lock"; } + bool fix_length_and_dec() { max_length= 1; maybe_null= 1; return FALSE; } + Item *get_copy(THD *thd) final + { return get_item_copy<Item_func_get_lock>(thd, this); } +}; + + +class Item_func_release_all_locks final :public Item_func_lock +{ +public: + Item_func_release_all_locks(THD *thd): Item_func_lock(thd) + { unsigned_flag= 1; } + longlong val_int() final; + const char *func_name() const final { return "release_all_locks"; } + Item *get_copy(THD *thd) final + { return get_item_copy<Item_func_release_all_locks>(thd, this); } +}; + + +class Item_func_release_lock final :public Item_func_lock +{ + bool check_arguments() const + { return args[0]->check_type_general_purpose_string(func_name()); } + String value; +public: + Item_func_release_lock(THD *thd, Item *a): Item_func_lock(thd, a) {} + longlong val_int() final; + const char *func_name() const { return "release_lock"; } + bool fix_length_and_dec() { max_length= 1; maybe_null= 1; return FALSE; } + Item *get_copy(THD *thd) final + { return get_item_copy<Item_func_release_lock>(thd, this); } +}; + + +/* replication functions */ + +class Item_master_pos_wait :public Item_longlong_func +{ + bool check_arguments() const + { + return + args[0]->check_type_general_purpose_string(func_name()) || + args[1]->check_type_can_return_int(func_name()) || + (arg_count > 2 && args[2]->check_type_can_return_int(func_name())) || + (arg_count > 3 && args[3]->check_type_general_purpose_string(func_name())); + } + String value; +public: + Item_master_pos_wait(THD *thd, Item *a, Item *b) + :Item_longlong_func(thd, a, b) {} + Item_master_pos_wait(THD *thd, Item *a, Item *b, Item *c): + Item_longlong_func(thd, a, b, c) {} + Item_master_pos_wait(THD *thd, Item *a, Item *b, Item *c, Item *d): + Item_longlong_func(thd, a, b, c, d) {} + longlong val_int(); + const char *func_name() const { return "master_pos_wait"; } + bool fix_length_and_dec() { max_length=21; maybe_null=1; return FALSE; } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_master_pos_wait>(thd, this); } +}; + + +class Item_master_gtid_wait :public Item_long_func +{ + bool check_arguments() const + { + return args[0]->check_type_general_purpose_string(func_name()) || + (arg_count > 1 && args[1]->check_type_can_return_real(func_name())); + } + String value; +public: + Item_master_gtid_wait(THD *thd, Item *a) + :Item_long_func(thd, a) {} + Item_master_gtid_wait(THD *thd, Item *a, Item *b) + :Item_long_func(thd, a, b) {} + longlong val_int(); + const char *func_name() const { return "master_gtid_wait"; } + bool fix_length_and_dec() { max_length=2; return FALSE; } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_master_gtid_wait>(thd, this); } +}; + + +/* Handling of user definable variables */ + +class user_var_entry; + + +/** + A class to set and get user variables +*/ +class Item_func_user_var :public Item_hybrid_func +{ +protected: + user_var_entry *m_var_entry; +public: + LEX_CSTRING name; // keep it public + Item_func_user_var(THD *thd, const LEX_CSTRING *a) + :Item_hybrid_func(thd), m_var_entry(NULL), name(*a) { } + Item_func_user_var(THD *thd, const LEX_CSTRING *a, Item *b) + :Item_hybrid_func(thd, b), m_var_entry(NULL), name(*a) { } + Item_func_user_var(THD *thd, Item_func_user_var *item) + :Item_hybrid_func(thd, item), + m_var_entry(item->m_var_entry), name(item->name) { } + Field *create_tmp_field_ex(MEM_ROOT *root, TABLE *table, Tmp_field_src *src, + const Tmp_field_param *param) + { + DBUG_ASSERT(fixed); + return create_tmp_field_ex_from_handler(root, table, src, param, + type_handler()); + } + Field *create_field_for_create_select(MEM_ROOT *root, TABLE *table) + { return create_table_field_from_handler(root, table); } + bool check_vcol_func_processor(void *arg); + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) + { + return type_handler()->Item_get_date_with_warn(thd, this, ltime, fuzzydate); + } +}; + + +class Item_func_set_user_var :public Item_func_user_var +{ + /* + The entry_thread_id variable is used: + 1) to skip unnecessary updates of the entry field (see above); + 2) to reset the entry field that was initialized in the other thread + (for example, an item tree of a trigger that updates user variables + may be shared between several connections, and the entry_thread_id field + prevents updates of one connection user variables from a concurrent + connection calling the same trigger that initially updated some + user variable it the first connection context). + */ + my_thread_id entry_thread_id; + String value; + my_decimal decimal_buff; + bool null_item; + union + { + longlong vint; + double vreal; + String *vstr; + my_decimal *vdec; + } save_result; + +public: + Item_func_set_user_var(THD *thd, const LEX_CSTRING *a, Item *b): + Item_func_user_var(thd, a, b), + entry_thread_id(0) + {} + Item_func_set_user_var(THD *thd, Item_func_set_user_var *item) + :Item_func_user_var(thd, item), + entry_thread_id(item->entry_thread_id), + value(item->value), decimal_buff(item->decimal_buff), + null_item(item->null_item), save_result(item->save_result) + {} + + enum Functype functype() const { return SUSERVAR_FUNC; } + double val_real(); + longlong val_int(); + String *val_str(String *str); + my_decimal *val_decimal(my_decimal *); + double val_result(); + longlong val_int_result(); + bool val_bool_result(); + String *str_result(String *str); + my_decimal *val_decimal_result(my_decimal *); + bool is_null_result(); + bool update_hash(void *ptr, size_t length, enum Item_result type, + CHARSET_INFO *cs, bool unsigned_arg); + bool send(Protocol *protocol, st_value *buffer); + void make_send_field(THD *thd, Send_field *tmp_field); + bool check(bool use_result_field); + void save_item_result(Item *item); + bool update(); + bool fix_fields(THD *thd, Item **ref); + bool fix_length_and_dec(); + void print(String *str, enum_query_type query_type); + enum precedence precedence() const { return ASSIGN_PRECEDENCE; } + void print_as_stmt(String *str, enum_query_type query_type); + const char *func_name() const { return "set_user_var"; } + int save_in_field(Field *field, bool no_conversions, + bool can_use_result_field); + int save_in_field(Field *field, bool no_conversions) + { + return save_in_field(field, no_conversions, 1); + } + void save_org_in_field(Field *field, + fast_field_copier data __attribute__ ((__unused__))) + { (void)save_in_field(field, 1, 0); } + bool register_field_in_read_map(void *arg); + bool register_field_in_bitmap(void *arg); + bool set_entry(THD *thd, bool create_if_not_exists); + void cleanup(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_set_user_var>(thd, this); } + bool excl_dep_on_table(table_map tab_map) { return false; } +}; + + +class Item_func_get_user_var :public Item_func_user_var, + private Settable_routine_parameter +{ +public: + Item_func_get_user_var(THD *thd, const LEX_CSTRING *a): + Item_func_user_var(thd, a) {} + enum Functype functype() const { return GUSERVAR_FUNC; } + LEX_CSTRING get_name() { return name; } + double val_real(); + longlong val_int(); + my_decimal *val_decimal(my_decimal*); + String *val_str(String* str); + bool fix_length_and_dec(); + virtual void print(String *str, enum_query_type query_type); + /* + We must always return variables as strings to guard against selects of type + select @t1:=1,@t1,@t:="hello",@t from foo where (@t1:= t2.b) + */ + const char *func_name() const { return "get_user_var"; } + bool const_item() const; + table_map used_tables() const + { return const_item() ? 0 : RAND_TABLE_BIT; } + bool eq(const Item *item, bool binary_cmp) const; + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_get_user_var>(thd, this); } +private: + bool set_value(THD *thd, sp_rcontext *ctx, Item **it); + +public: + Settable_routine_parameter *get_settable_routine_parameter() + { + return this; + } +}; + + +/* + This item represents user variable used as out parameter (e.g in LOAD DATA), + and it is supposed to be used only for this purprose. So it is simplified + a lot. Actually you should never obtain its value. + + The only two reasons for this thing being an Item is possibility to store it + in List<Item> and desire to place this code somewhere near other functions + working with user variables. +*/ +class Item_user_var_as_out_param :public Item_fixed_hybrid, + public Load_data_outvar +{ + LEX_CSTRING org_name; + user_var_entry *entry; +public: + Item_user_var_as_out_param(THD *thd, const LEX_CSTRING *a) + :Item_fixed_hybrid(thd) + { + DBUG_ASSERT(a->length < UINT_MAX32); + org_name= *a; + set_name(thd, a->str, a->length, system_charset_info); + } + Load_data_outvar *get_load_data_outvar() + { + return this; + } + bool load_data_set_null(THD *thd, const Load_data_param *param) + { + set_null_value(param->charset()); + return false; + } + bool load_data_set_no_data(THD *thd, const Load_data_param *param) + { + set_null_value(param->charset()); + return false; + } + bool load_data_set_value(THD *thd, const char *pos, uint length, + const Load_data_param *param) + { + set_value(pos, length, param->charset()); + return false; + } + void load_data_print_for_log_event(THD *thd, String *to) const; + bool load_data_add_outvar(THD *thd, Load_data_param *param) const + { + return param->add_outvar_user_var(thd); + } + uint load_data_fixed_length() const + { + return 0; + } + Field *create_tmp_field_ex(MEM_ROOT *root, TABLE *table, Tmp_field_src *src, + const Tmp_field_param *param) + { + DBUG_ASSERT(0); + return NULL; + } + /* We should return something different from FIELD_ITEM here */ + enum Type type() const { return CONST_ITEM;} + double val_real(); + longlong val_int(); + String *val_str(String *str); + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate); + my_decimal *val_decimal(my_decimal *decimal_buffer); + /* fix_fields() binds variable name with its entry structure */ + bool fix_fields(THD *thd, Item **ref); + void set_null_value(CHARSET_INFO* cs); + void set_value(const char *str, uint length, CHARSET_INFO* cs); + const Type_handler *type_handler() const { return &type_handler_double; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_user_var_as_out_param>(thd, this); } +}; + + +/* A system variable */ + +#define GET_SYS_VAR_CACHE_LONG 1 +#define GET_SYS_VAR_CACHE_DOUBLE 2 +#define GET_SYS_VAR_CACHE_STRING 4 + +class Item_func_get_system_var :public Item_func +{ + sys_var *var; + enum_var_type var_type, orig_var_type; + LEX_CSTRING component; + longlong cached_llval; + double cached_dval; + String cached_strval; + bool cached_null_value; + query_id_t used_query_id; + uchar cache_present; + +public: + Item_func_get_system_var(THD *thd, sys_var *var_arg, + enum_var_type var_type_arg, + LEX_CSTRING *component_arg, const char *name_arg, + size_t name_len_arg); + enum Functype functype() const { return GSYSVAR_FUNC; } + void update_null_value(); + bool fix_length_and_dec(); + void print(String *str, enum_query_type query_type); + bool const_item() const { return true; } + table_map used_tables() const { return 0; } + const Type_handler *type_handler() const; + double val_real(); + longlong val_int(); + String* val_str(String*); + my_decimal *val_decimal(my_decimal *dec_buf) + { return val_decimal_from_real(dec_buf); } + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) + { + return type_handler()->Item_get_date_with_warn(thd, this, ltime, fuzzydate); + } + /* TODO: fix to support views */ + const char *func_name() const { return "get_system_var"; } + /** + Indicates whether this system variable is written to the binlog or not. + + Variables are written to the binlog as part of "status_vars" in + Query_log_event, as an Intvar_log_event, or a Rand_log_event. + + @return true if the variable is written to the binlog, false otherwise. + */ + bool is_written_to_binlog(); + bool eq(const Item *item, bool binary_cmp) const; + + void cleanup(); + bool check_vcol_func_processor(void *arg); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_get_system_var>(thd, this); } +}; + + +/* for fulltext search */ + +class Item_func_match :public Item_real_func +{ +public: + uint key, flags; + bool join_key; + DTCollation cmp_collation; + FT_INFO *ft_handler; + TABLE *table; + Item_func_match *master; // for master-slave optimization + Item *concat_ws; // Item_func_concat_ws + String value; // value of concat_ws + String search_value; // key_item()'s value converted to cmp_collation + + Item_func_match(THD *thd, List<Item> &a, uint b): + Item_real_func(thd, a), key(0), flags(b), join_key(0), ft_handler(0), + table(0), master(0), concat_ws(0) { } + void cleanup() + { + DBUG_ENTER("Item_func_match::cleanup"); + Item_real_func::cleanup(); + if (!master && ft_handler) + ft_handler->please->close_search(ft_handler); + ft_handler= 0; + concat_ws= 0; + table= 0; // required by Item_func_match::eq() + DBUG_VOID_RETURN; + } + bool is_expensive_processor(void *arg) { return TRUE; } + enum Functype functype() const { return FT_FUNC; } + const char *func_name() const { return "match"; } + bool eval_not_null_tables(void *opt_arg) + { + not_null_tables_cache= 0; + return 0; + } + bool find_not_null_fields(table_map allowed) + { + return false; + } + bool fix_fields(THD *thd, Item **ref); + bool eq(const Item *, bool binary_cmp) const; + /* The following should be safe, even if we compare doubles */ + longlong val_int() { DBUG_ASSERT(fixed == 1); return val_real() != 0.0; } + double val_real(); + virtual void print(String *str, enum_query_type query_type); + + bool fix_index(); + bool init_search(THD *thd, bool no_order); + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function("match ... against()", arg, VCOL_IMPOSSIBLE); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_match>(thd, this); } + Item *build_clone(THD *thd) { return 0; } +private: + /** + Check whether storage engine for given table, + allows FTS Boolean search on non-indexed columns. + + @todo A flag should be added to the extended fulltext API so that + it may be checked whether search on non-indexed columns are + supported. Currently, it is not possible to check for such a + flag since @c this->ft_handler is not yet set when this function is + called. The current hack is to assume that search on non-indexed + columns are supported for engines that does not support the extended + fulltext API (e.g., MyISAM), while it is not supported for other + engines (e.g., InnoDB) + + @param table_arg Table for which storage engine to check + + @retval true if BOOLEAN search on non-indexed columns is supported + @retval false otherwise + */ + bool allows_search_on_non_indexed_columns(TABLE* table_arg) + { + // Only Boolean search may support non_indexed columns + if (!(flags & FT_BOOL)) + return false; + + DBUG_ASSERT(table_arg && table_arg->file); + + // Assume that if extended fulltext API is not supported, + // non-indexed columns are allowed. This will be true for MyISAM. + if ((table_arg->file->ha_table_flags() & HA_CAN_FULLTEXT_EXT) == 0) + return true; + + return false; + } +}; + + +class Item_func_bit_xor : public Item_func_bit_operator +{ +public: + Item_func_bit_xor(THD *thd, Item *a, Item *b) + :Item_func_bit_operator(thd, a, b) {} + bool fix_length_and_dec(); + const char *func_name() const { return "^"; } + enum precedence precedence() const { return BITXOR_PRECEDENCE; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_bit_xor>(thd, this); } +}; + +class Item_func_is_free_lock :public Item_long_func +{ + bool check_arguments() const + { return args[0]->check_type_general_purpose_string(func_name()); } + String value; +public: + Item_func_is_free_lock(THD *thd, Item *a): Item_long_func(thd, a) {} + longlong val_int(); + const char *func_name() const { return "is_free_lock"; } + bool fix_length_and_dec() + { + decimals=0; max_length=1; maybe_null=1; + return FALSE; + } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_is_free_lock>(thd, this); } +}; + +class Item_func_is_used_lock :public Item_long_func +{ + bool check_arguments() const + { return args[0]->check_type_general_purpose_string(func_name()); } + String value; +public: + Item_func_is_used_lock(THD *thd, Item *a): Item_long_func(thd, a) {} + longlong val_int(); + const char *func_name() const { return "is_used_lock"; } + bool fix_length_and_dec() + { + decimals=0; max_length=10; maybe_null=1; + return FALSE; + } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_is_used_lock>(thd, this); } +}; + + +struct Lex_cast_type_st: public Lex_length_and_dec_st +{ +private: + const Type_handler *m_type_handler; +public: + void set(const Type_handler *handler, const char *length, const char *dec) + { + m_type_handler= handler; + Lex_length_and_dec_st::set(length, dec); + } + void set(const Type_handler *handler, Lex_length_and_dec_st length_and_dec) + { + m_type_handler= handler; + Lex_length_and_dec_st::operator=(length_and_dec); + } + void set(const Type_handler *handler, const char *length) + { + set(handler, length, 0); + } + void set(const Type_handler *handler) + { + set(handler, 0, 0); + } + const Type_handler *type_handler() const { return m_type_handler; } + Item *create_typecast_item(THD *thd, Item *item, + CHARSET_INFO *cs= NULL) const + { + return m_type_handler-> + create_typecast_item(thd, item, + Type_cast_attributes(length(), dec(), cs)); + } + Item *create_typecast_item_or_error(THD *thd, Item *item, + CHARSET_INFO *cs= NULL) const; +}; + + +class Item_func_row_count :public Item_longlong_func +{ +public: + Item_func_row_count(THD *thd): Item_longlong_func(thd) {} + longlong val_int(); + const char *func_name() const { return "row_count"; } + bool fix_length_and_dec() { decimals= 0; maybe_null=0; return FALSE; } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_row_count>(thd, this); } +}; + + +/* + * + * Stored FUNCTIONs + * + */ + +class Item_func_sp :public Item_func, + public Item_sp +{ +private: + const Sp_handler *m_handler; + + bool execute(); + +protected: + bool is_expensive_processor(void *arg) + { return is_expensive(); } + + bool check_arguments() const + { + // sp_prepare_func_item() checks that the number of columns is correct + return false; + } +public: + + Item_func_sp(THD *thd, Name_resolution_context *context_arg, + sp_name *name, const Sp_handler *sph); + + Item_func_sp(THD *thd, Name_resolution_context *context_arg, + sp_name *name, const Sp_handler *sph, List<Item> &list); + + virtual ~Item_func_sp() + {} + + void update_used_tables(); + + void cleanup(); + + const char *func_name() const; + + const Type_handler *type_handler() const; + + Field *create_tmp_field_ex(MEM_ROOT *root, TABLE *table, Tmp_field_src *src, + const Tmp_field_param *param); + Field *create_field_for_create_select(MEM_ROOT *root, TABLE *table) + { + return result_type() != STRING_RESULT ? + sp_result_field : + create_table_field_from_handler(root, table); + } + void make_send_field(THD *thd, Send_field *tmp_field); + + longlong val_int() + { + if (execute()) + return (longlong) 0; + return sp_result_field->val_int(); + } + + double val_real() + { + if (execute()) + return 0.0; + return sp_result_field->val_real(); + } + + my_decimal *val_decimal(my_decimal *dec_buf) + { + if (execute()) + return NULL; + return sp_result_field->val_decimal(dec_buf); + } + + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) + { + if (execute()) + return true; + return sp_result_field->get_date(ltime, fuzzydate); + } + + String *val_str(String *str) + { + String buf; + char buff[20]; + buf.set(buff, 20, str->charset()); + buf.length(0); + if (execute()) + return NULL; + /* + result_field will set buf pointing to internal buffer + of the resul_field. Due to this it will change any time + when SP is executed. In order to prevent occasional + corruption of returned value, we make here a copy. + */ + sp_result_field->val_str(&buf); + str->copy(buf); + return str; + } + + bool val_native(THD *thd, Native *to) + { + if (execute()) + return true; + return null_value= sp_result_field->val_native(to); + } + + void update_null_value() + { + execute(); + } + + virtual bool change_context_processor(void *cntx) + { context= (Name_resolution_context *)cntx; return FALSE; } + + virtual enum Functype functype() const { return FUNC_SP; } + + bool fix_fields(THD *thd, Item **ref); + bool fix_length_and_dec(void); + bool is_expensive(); + + inline Field *get_sp_result_field() + { + return sp_result_field; + } + const sp_name *get_sp_name() const + { + return m_name; + } + + bool check_vcol_func_processor(void *arg); + bool limit_index_condition_pushdown_processor(void *opt_arg) + { + return TRUE; + } + Item *get_copy(THD *) { return 0; } + bool eval_not_null_tables(void *opt_arg) + { + not_null_tables_cache= 0; + return 0; + } + bool excl_dep_on_grouping_fields(st_select_lex *sel) + { return false; } + bool find_not_null_fields(table_map allowed) + { + return false; + } +}; + + +class Item_func_found_rows :public Item_longlong_func +{ +public: + Item_func_found_rows(THD *thd): Item_longlong_func(thd) {} + longlong val_int(); + const char *func_name() const { return "found_rows"; } + bool fix_length_and_dec() { decimals= 0; maybe_null=0; return FALSE; } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_found_rows>(thd, this); } +}; + + +class Item_func_oracle_sql_rowcount :public Item_longlong_func +{ +public: + Item_func_oracle_sql_rowcount(THD *thd): Item_longlong_func(thd) {} + longlong val_int(); + const char *func_name() const { return "SQL%ROWCOUNT"; } + void print(String *str, enum_query_type query_type) + { + str->append(func_name()); + } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_oracle_sql_rowcount>(thd, this); } +}; + + +class Item_func_sqlcode: public Item_long_func +{ +public: + Item_func_sqlcode(THD *thd): Item_long_func(thd) { } + longlong val_int(); + const char *func_name() const { return "SQLCODE"; } + void print(String *str, enum_query_type query_type) + { + str->append(func_name()); + } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); + } + bool fix_length_and_dec() + { + maybe_null= null_value= false; + max_length= 11; + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_sqlcode>(thd, this); } +}; + + +void uuid_short_init(); + +class Item_func_uuid_short :public Item_longlong_func +{ +public: + Item_func_uuid_short(THD *thd): Item_longlong_func(thd) {} + const char *func_name() const { return "uuid_short"; } + longlong val_int(); + bool const_item() const { return false; } + bool fix_length_and_dec() + { max_length= 21; unsigned_flag=1; return FALSE; } + table_map used_tables() const { return RAND_TABLE_BIT; } + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, VCOL_NON_DETERMINISTIC); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_uuid_short>(thd, this); } +}; + + +class Item_func_last_value :public Item_func +{ +protected: + Item *last_value; +public: + Item_func_last_value(THD *thd, List<Item> &list): Item_func(thd, list) {} + double val_real(); + longlong val_int(); + String *val_str(String *); + my_decimal *val_decimal(my_decimal *); + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate); + bool val_native(THD *thd, Native *); + bool fix_length_and_dec(); + const char *func_name() const { return "last_value"; } + const Type_handler *type_handler() const { return last_value->type_handler(); } + bool eval_not_null_tables(void *) + { + not_null_tables_cache= 0; + return 0; + } + bool find_not_null_fields(table_map allowed) + { + return false; + } + bool const_item() const { return 0; } + void evaluate_sideeffects(); + void update_used_tables() + { + Item_func::update_used_tables(); + maybe_null= last_value->maybe_null; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_last_value>(thd, this); } +}; + + +/* Implementation for sequences: NEXT VALUE FOR sequence and NEXTVAL() */ + +class Item_func_nextval :public Item_longlong_func +{ +protected: + TABLE_LIST *table_list; + TABLE *table; +public: + Item_func_nextval(THD *thd, TABLE_LIST *table_list_arg): + Item_longlong_func(thd), table_list(table_list_arg) {} + longlong val_int(); + const char *func_name() const { return "nextval"; } + bool fix_length_and_dec() + { + unsigned_flag= 0; + max_length= MAX_BIGINT_WIDTH; + maybe_null= 1; /* In case of errors */ + return FALSE; + } + /* + update_table() function must be called during the value function + as in case of DEFAULT the sequence table may not yet be open + while fix_fields() are called + */ + void update_table() + { + if (!(table= table_list->table)) + { + /* + If nextval was used in DEFAULT then next_local points to + the table_list used by to open the sequence table + */ + table= table_list->next_local->table; + } + } + bool const_item() const { return 0; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_nextval>(thd, this); } + void print(String *str, enum_query_type query_type); + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(func_name(), "()", arg, + (VCOL_NON_DETERMINISTIC | + VCOL_NOT_VIRTUAL)); + } +}; + + +/* Implementation for sequences: LASTVAL(sequence), PostgreSQL style */ + +class Item_func_lastval :public Item_func_nextval +{ +public: + Item_func_lastval(THD *thd, TABLE_LIST *table_list_arg): + Item_func_nextval(thd, table_list_arg) {} + longlong val_int(); + const char *func_name() const { return "lastval"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_lastval>(thd, this); } +}; + + +/* Implementation for sequences: SETVAL(sequence), PostgreSQL style */ + +class Item_func_setval :public Item_func_nextval +{ + longlong nextval; + ulonglong round; + bool is_used; +public: + Item_func_setval(THD *thd, TABLE_LIST *table_list_arg, longlong nextval_arg, + ulonglong round_arg, bool is_used_arg) + : Item_func_nextval(thd, table_list_arg), + nextval(nextval_arg), round(round_arg), is_used(is_used_arg) + {} + longlong val_int(); + const char *func_name() const { return "setval"; } + void print(String *str, enum_query_type query_type); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_setval>(thd, this); } +}; + + +Item *get_system_var(THD *thd, enum_var_type var_type, + const LEX_CSTRING *name, const LEX_CSTRING *component); +extern bool check_reserved_words(const LEX_CSTRING *name); +double my_double_round(double value, longlong dec, bool dec_unsigned, + bool truncate); + +extern bool volatile mqh_used; + +bool update_hash(user_var_entry *entry, bool set_null, void *ptr, size_t length, + Item_result type, CHARSET_INFO *cs, + bool unsigned_arg); + +#endif /* ITEM_FUNC_INCLUDED */ |