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Diffstat (limited to '')
| -rw-r--r-- | sql/item_strfunc.h | 1876 |
1 files changed, 1876 insertions, 0 deletions
diff --git a/sql/item_strfunc.h b/sql/item_strfunc.h new file mode 100644 index 00000000..36300e57 --- /dev/null +++ b/sql/item_strfunc.h @@ -0,0 +1,1876 @@ +#ifndef ITEM_STRFUNC_INCLUDED +#define ITEM_STRFUNC_INCLUDED + +/* + Copyright (c) 2000, 2011, Oracle and/or its affiliates. + Copyright (c) 2009, 2019, 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 */ + + +/* This file defines all string functions */ + +#ifdef USE_PRAGMA_INTERFACE +#pragma interface /* gcc class implementation */ +#endif + +extern size_t username_char_length; + +class Item_str_func :public Item_func +{ +protected: + /** + Sets the result value of the function an empty string, using the current + character set. No memory is allocated. + @retval A pointer to the str_value member. + */ + virtual String *make_empty_result() + { + /* + Reset string length to an empty string. We don't use str_value.set() as + we don't want to free and potentially have to reallocate the buffer + for each call. + */ + if (!str_value.is_alloced()) + str_value.set("", 0, collation.collation); /* Avoid null ptrs */ + else + { + str_value.length(0); /* Reuse allocated area */ + str_value.set_charset(collation.collation); + } + return &str_value; + } +public: + Item_str_func(THD *thd): Item_func(thd) { decimals=NOT_FIXED_DEC; } + Item_str_func(THD *thd, Item *a): Item_func(thd, a) {decimals=NOT_FIXED_DEC; } + Item_str_func(THD *thd, Item *a, Item *b): + Item_func(thd, a, b) { decimals=NOT_FIXED_DEC; } + Item_str_func(THD *thd, Item *a, Item *b, Item *c): + Item_func(thd, a, b, c) { decimals=NOT_FIXED_DEC; } + Item_str_func(THD *thd, Item *a, Item *b, Item *c, Item *d): + Item_func(thd, a, b, c, d) { decimals=NOT_FIXED_DEC; } + Item_str_func(THD *thd, Item *a, Item *b, Item *c, Item *d, Item* e): + Item_func(thd, a, b, c, d, e) { decimals=NOT_FIXED_DEC; } + Item_str_func(THD *thd, List<Item> &list): + Item_func(thd, list) { decimals=NOT_FIXED_DEC; } + longlong val_int(); + double val_real(); + my_decimal *val_decimal(my_decimal *); + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) + { return get_date_from_string(thd, ltime, fuzzydate); } + const Type_handler *type_handler() const { return string_type_handler(); } + void left_right_max_length(); + bool fix_fields(THD *thd, Item **ref); +}; + + + +/* + Functions that return values with ASCII repertoire +*/ +class Item_str_ascii_func :public Item_str_func +{ + String ascii_buf; +public: + Item_str_ascii_func(THD *thd): Item_str_func(thd) {} + Item_str_ascii_func(THD *thd, Item *a): Item_str_func(thd, a) {} + Item_str_ascii_func(THD *thd, Item *a, Item *b): Item_str_func(thd, a, b) {} + Item_str_ascii_func(THD *thd, Item *a, Item *b, Item *c): + Item_str_func(thd, a, b, c) {} + String *val_str(String *str) + { + return val_str_from_val_str_ascii(str, &ascii_buf); + } + String *val_str_ascii(String *)= 0; +}; + + +/** + Functions that return a checksum or a hash of the argument, + or somehow else encode or decode the argument, + returning an ASCII-repertoire string. +*/ +class Item_str_ascii_checksum_func: public Item_str_ascii_func +{ +public: + Item_str_ascii_checksum_func(THD *thd, Item *a) + :Item_str_ascii_func(thd, a) { } + Item_str_ascii_checksum_func(THD *thd, Item *a, Item *b) + :Item_str_ascii_func(thd, a, b) { } + bool eq(const Item *item, bool binary_cmp) const + { + // Always use binary argument comparison: MD5('x') != MD5('X') + return Item_func::eq(item, true); + } +}; + + +/** + Functions that return a checksum or a hash of the argument, + or somehow else encode or decode the argument, + returning a binary string. +*/ +class Item_str_binary_checksum_func: public Item_str_func +{ +public: + Item_str_binary_checksum_func(THD *thd, Item *a) + :Item_str_func(thd, a) { } + Item_str_binary_checksum_func(THD *thd, Item *a, Item *b) + :Item_str_func(thd, a, b) { } + bool eq(const Item *item, bool binary_cmp) const + { + /* + Always use binary argument comparison: + FROM_BASE64('test') != FROM_BASE64('TEST') + */ + return Item_func::eq(item, true); + } +}; + + +class Item_func_md5 :public Item_str_ascii_checksum_func +{ +public: + Item_func_md5(THD *thd, Item *a): Item_str_ascii_checksum_func(thd, a) {} + String *val_str_ascii(String *); + bool fix_length_and_dec() + { + fix_length_and_charset(32, default_charset()); + return FALSE; + } + const char *func_name() const { return "md5"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_md5>(thd, this); } +}; + + +class Item_func_sha :public Item_str_ascii_checksum_func +{ +public: + Item_func_sha(THD *thd, Item *a): Item_str_ascii_checksum_func(thd, a) {} + String *val_str_ascii(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "sha"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_sha>(thd, this); } +}; + +class Item_func_sha2 :public Item_str_ascii_checksum_func +{ +public: + Item_func_sha2(THD *thd, Item *a, Item *b) + :Item_str_ascii_checksum_func(thd, a, b) {} + String *val_str_ascii(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "sha2"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_sha2>(thd, this); } +}; + +class Item_func_to_base64 :public Item_str_ascii_checksum_func +{ + String tmp_value; +public: + Item_func_to_base64(THD *thd, Item *a) + :Item_str_ascii_checksum_func(thd, a) {} + String *val_str_ascii(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "to_base64"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_to_base64>(thd, this); } +}; + +class Item_func_from_base64 :public Item_str_binary_checksum_func +{ + String tmp_value; +public: + Item_func_from_base64(THD *thd, Item *a) + :Item_str_binary_checksum_func(thd, a) { } + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "from_base64"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_from_base64>(thd, this); } +}; + +#include <my_crypt.h> + +class Item_aes_crypt :public Item_str_binary_checksum_func +{ + enum { AES_KEY_LENGTH = 128 }; + void create_key(String *user_key, uchar* key); + +protected: + int what; + String tmp_value; +public: + Item_aes_crypt(THD *thd, Item *a, Item *b) + :Item_str_binary_checksum_func(thd, a, b) {} + String *val_str(String *); +}; + +class Item_func_aes_encrypt :public Item_aes_crypt +{ +public: + Item_func_aes_encrypt(THD *thd, Item *a, Item *b) + :Item_aes_crypt(thd, a, b) {} + bool fix_length_and_dec(); + const char *func_name() const { return "aes_encrypt"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_aes_encrypt>(thd, this); } +}; + +class Item_func_aes_decrypt :public Item_aes_crypt +{ +public: + Item_func_aes_decrypt(THD *thd, Item *a, Item *b): + Item_aes_crypt(thd, a, b) {} + bool fix_length_and_dec(); + const char *func_name() const { return "aes_decrypt"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_aes_decrypt>(thd, this); } +}; + + +class Item_func_concat :public Item_str_func +{ +protected: + String tmp_value; + /* + Append a non-NULL value to the result. + @param [IN] thd - The current thread. + @param [IN/OUT] res - The current val_str() return value. + @param [IN] app - The value to be appended. + @retval - false on success, true on error + */ + bool append_value(THD *thd, String *res, const String *app); + bool realloc_result(String *str, uint length) const; +public: + Item_func_concat(THD *thd, List<Item> &list): Item_str_func(thd, list) {} + Item_func_concat(THD *thd, Item *a, Item *b): Item_str_func(thd, a, b) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "concat"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_concat>(thd, this); } +}; + + +/* + This class handles the || operator in sql_mode=ORACLE. + Unlike the traditional MariaDB concat(), it treats NULL arguments as ''. +*/ +class Item_func_concat_operator_oracle :public Item_func_concat +{ +public: + Item_func_concat_operator_oracle(THD *thd, List<Item> &list) + :Item_func_concat(thd, list) + { } + Item_func_concat_operator_oracle(THD *thd, Item *a, Item *b) + :Item_func_concat(thd, a, b) + { } + String *val_str(String *); + const char *func_name() const { return "concat_operator_oracle"; } + Item *get_copy(THD *thd) + { + return get_item_copy<Item_func_concat_operator_oracle>(thd, this); + } +}; + + +class Item_func_decode_histogram :public Item_str_func +{ +public: + Item_func_decode_histogram(THD *thd, Item *a, Item *b): + Item_str_func(thd, a, b) {} + String *val_str(String *); + bool fix_length_and_dec() + { + collation.set(system_charset_info); + max_length= MAX_BLOB_WIDTH; + maybe_null= 1; + return FALSE; + } + const char *func_name() const { return "decode_histogram"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_decode_histogram>(thd, this); } +}; + +class Item_func_concat_ws :public Item_str_func +{ + String tmp_value; +public: + Item_func_concat_ws(THD *thd, List<Item> &list): Item_str_func(thd, list) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "concat_ws"; } + table_map not_null_tables() const { return 0; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_concat_ws>(thd, this); } +}; + +class Item_func_reverse :public Item_str_func +{ + String tmp_value; +public: + Item_func_reverse(THD *thd, Item *a): Item_str_func(thd, a) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "reverse"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_reverse>(thd, this); } +}; + + +class Item_func_replace :public Item_str_func +{ + String tmp_value,tmp_value2; +public: + Item_func_replace(THD *thd, Item *org, Item *find, Item *replace): + Item_str_func(thd, org, find, replace) {} + String *val_str(String *to) { return val_str_internal(to, NULL); }; + bool fix_length_and_dec(); + String *val_str_internal(String *str, String *empty_string_for_null); + const char *func_name() const { return "replace"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_replace>(thd, this); } +}; + + +class Item_func_replace_oracle :public Item_func_replace +{ + String tmp_emtpystr; +public: + Item_func_replace_oracle(THD *thd, Item *org, Item *find, Item *replace): + Item_func_replace(thd, org, find, replace) {} + String *val_str(String *to) { return val_str_internal(to, &tmp_emtpystr); }; + const char *func_name() const { return "replace_oracle"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_replace_oracle>(thd, this); } +}; + + +class Item_func_regexp_replace :public Item_str_func +{ + Regexp_processor_pcre re; + bool append_replacement(String *str, + const LEX_CSTRING *source, + const LEX_CSTRING *replace); +public: + Item_func_regexp_replace(THD *thd, Item *a, Item *b, Item *c): + Item_str_func(thd, a, b, c) + {} + void cleanup() + { + DBUG_ENTER("Item_func_regexp_replace::cleanup"); + Item_str_func::cleanup(); + re.cleanup(); + DBUG_VOID_RETURN; + } + String *val_str(String *str); + bool fix_length_and_dec(); + const char *func_name() const { return "regexp_replace"; } + Item *get_copy(THD *thd) { return 0;} +}; + + +class Item_func_regexp_substr :public Item_str_func +{ + Regexp_processor_pcre re; +public: + Item_func_regexp_substr(THD *thd, Item *a, Item *b): + Item_str_func(thd, a, b) + {} + void cleanup() + { + DBUG_ENTER("Item_func_regexp_substr::cleanup"); + Item_str_func::cleanup(); + re.cleanup(); + DBUG_VOID_RETURN; + } + String *val_str(String *str); + bool fix_length_and_dec(); + const char *func_name() const { return "regexp_substr"; } + Item *get_copy(THD *thd) { return 0; } +}; + + +class Item_func_insert :public Item_str_func +{ + String tmp_value; +public: + Item_func_insert(THD *thd, Item *org, Item *start, Item *length, + Item *new_str): + Item_str_func(thd, org, start, length, new_str) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "insert"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_insert>(thd, this); } +}; + + +class Item_str_conv :public Item_str_func +{ +protected: + uint multiply; + my_charset_conv_case converter; + String tmp_value; +public: + Item_str_conv(THD *thd, Item *item): Item_str_func(thd, item) {} + String *val_str(String *); +}; + + +class Item_func_lcase :public Item_str_conv +{ +public: + Item_func_lcase(THD *thd, Item *item): Item_str_conv(thd, item) {} + const char *func_name() const { return "lcase"; } + bool fix_length_and_dec(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_lcase>(thd, this); } +}; + +class Item_func_ucase :public Item_str_conv +{ +public: + Item_func_ucase(THD *thd, Item *item): Item_str_conv(thd, item) {} + const char *func_name() const { return "ucase"; } + bool fix_length_and_dec(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_ucase>(thd, this); } +}; + + +class Item_func_left :public Item_str_func +{ + String tmp_value; +public: + Item_func_left(THD *thd, Item *a, Item *b): Item_str_func(thd, a, b) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "left"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_left>(thd, this); } +}; + + +class Item_func_right :public Item_str_func +{ + String tmp_value; +public: + Item_func_right(THD *thd, Item *a, Item *b): Item_str_func(thd, a, b) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "right"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_right>(thd, this); } +}; + + +class Item_func_substr :public Item_str_func +{ + String tmp_value; +protected: + virtual longlong get_position() { return args[1]->val_int(); } +public: + Item_func_substr(THD *thd, Item *a, Item *b): Item_str_func(thd, a, b) {} + Item_func_substr(THD *thd, Item *a, Item *b, Item *c): + Item_str_func(thd, a, b, c) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "substr"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_substr>(thd, this); } +}; + +class Item_func_substr_oracle :public Item_func_substr +{ +protected: + longlong get_position() + { longlong pos= args[1]->val_int(); return pos == 0 ? 1 : pos; } + String *make_empty_result() + { null_value= 1; return NULL; } +public: + Item_func_substr_oracle(THD *thd, Item *a, Item *b): + Item_func_substr(thd, a, b) {} + Item_func_substr_oracle(THD *thd, Item *a, Item *b, Item *c): + Item_func_substr(thd, a, b, c) {} + bool fix_length_and_dec() + { + bool res= Item_func_substr::fix_length_and_dec(); + maybe_null= true; + return res; + } + const char *func_name() const { return "substr_oracle"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_substr_oracle>(thd, this); } +}; + +class Item_func_substr_index :public Item_str_func +{ + String tmp_value; +public: + Item_func_substr_index(THD *thd, Item *a,Item *b,Item *c): + Item_str_func(thd, a, b, c) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "substring_index"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_substr_index>(thd, this); } + +}; + + +class Item_func_trim :public Item_str_func +{ +protected: + String tmp_value; + String remove; + String *trimmed_value(String *res, uint32 offset, uint32 length) + { + if (length == 0) + return make_empty_result(); + + tmp_value.set(*res, offset, length); + /* + Make sure to return correct charset and collation: + TRIM(0x000000 FROM _ucs2 0x0061) + should set charset to "binary" rather than to "ucs2". + */ + tmp_value.set_charset(collation.collation); + return &tmp_value; + } + String *non_trimmed_value(String *res) + { + return trimmed_value(res, 0, res->length()); + } + virtual const char *func_name_ext() const { return ""; } +public: + Item_func_trim(THD *thd, Item *a, Item *b): Item_str_func(thd, a, b) {} + Item_func_trim(THD *thd, Item *a): Item_str_func(thd, a) {} + Sql_mode_dependency value_depends_on_sql_mode() const; + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "trim"; } + void print(String *str, enum_query_type query_type); + virtual const char *mode_name() const { return "both"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_trim>(thd, this); } +}; + + +class Item_func_trim_oracle :public Item_func_trim +{ +protected: + String *make_empty_result() + { null_value= 1; return NULL; } + const char *func_name_ext() const { return "_oracle"; } +public: + Item_func_trim_oracle(THD *thd, Item *a, Item *b): + Item_func_trim(thd, a, b) {} + Item_func_trim_oracle(THD *thd, Item *a): Item_func_trim(thd, a) {} + const char *func_name() const { return "trim_oracle"; } + bool fix_length_and_dec() + { + bool res= Item_func_trim::fix_length_and_dec(); + maybe_null= true; + return res; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_trim_oracle>(thd, this); } +}; + + +class Item_func_ltrim :public Item_func_trim +{ +public: + Item_func_ltrim(THD *thd, Item *a, Item *b): Item_func_trim(thd, a, b) {} + Item_func_ltrim(THD *thd, Item *a): Item_func_trim(thd, a) {} + Sql_mode_dependency value_depends_on_sql_mode() const + { + return Item_func::value_depends_on_sql_mode(); + } + String *val_str(String *); + const char *func_name() const { return "ltrim"; } + const char *mode_name() const { return "leading"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_ltrim>(thd, this); } +}; + + +class Item_func_ltrim_oracle :public Item_func_ltrim +{ +protected: + String *make_empty_result() + { null_value= 1; return NULL; } + const char *func_name_ext() const { return "_oracle"; } +public: + Item_func_ltrim_oracle(THD *thd, Item *a, Item *b): + Item_func_ltrim(thd, a, b) {} + Item_func_ltrim_oracle(THD *thd, Item *a): Item_func_ltrim(thd, a) {} + const char *func_name() const { return "ltrim_oracle"; } + bool fix_length_and_dec() + { + bool res= Item_func_ltrim::fix_length_and_dec(); + maybe_null= true; + return res; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_ltrim_oracle>(thd, this); } +}; + + +class Item_func_rtrim :public Item_func_trim +{ +public: + Item_func_rtrim(THD *thd, Item *a, Item *b): Item_func_trim(thd, a, b) {} + Item_func_rtrim(THD *thd, Item *a): Item_func_trim(thd, a) {} + String *val_str(String *); + const char *func_name() const { return "rtrim"; } + const char *mode_name() const { return "trailing"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_rtrim>(thd, this); } +}; + + +class Item_func_rtrim_oracle :public Item_func_rtrim +{ +protected: + String *make_empty_result() + { null_value= 1; return NULL; } + const char *func_name_ext() const { return "_oracle"; } +public: + Item_func_rtrim_oracle(THD *thd, Item *a, Item *b): + Item_func_rtrim(thd, a, b) {} + Item_func_rtrim_oracle(THD *thd, Item *a): Item_func_rtrim(thd, a) {} + const char *func_name() const { return "rtrim_oracle"; } + bool fix_length_and_dec() + { + bool res= Item_func_rtrim::fix_length_and_dec(); + maybe_null= true; + return res; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_rtrim_oracle>(thd, this); } +}; + +/* + Item_func_password -- new (4.1.1) PASSWORD() function implementation. + Returns strcat('*', octet2hex(sha1(sha1(password)))). '*' stands for new + password format, sha1(sha1(password) is so-called hash_stage2 value. + Length of returned string is always 41 byte. To find out how entire + authentication procedure works, see comments in password.c. +*/ + +class Item_func_password :public Item_str_ascii_checksum_func +{ +public: + enum PW_Alg {OLD, NEW}; +private: + char tmp_value[SCRAMBLED_PASSWORD_CHAR_LENGTH+1]; + enum PW_Alg alg; + bool deflt; +public: + Item_func_password(THD *thd, Item *a): + Item_str_ascii_checksum_func(thd, a), alg(NEW), deflt(1) {} + Item_func_password(THD *thd, Item *a, PW_Alg al): + Item_str_ascii_checksum_func(thd, a), alg(al), deflt(0) {} + String *val_str_ascii(String *str); + bool fix_fields(THD *thd, Item **ref); + bool fix_length_and_dec() + { + fix_length_and_charset((alg == 1 ? + SCRAMBLED_PASSWORD_CHAR_LENGTH : + SCRAMBLED_PASSWORD_CHAR_LENGTH_323), + default_charset()); + return FALSE; + } + const char *func_name() const { return ((deflt || alg == 1) ? + "password" : "old_password"); } + static char *alloc(THD *thd, const char *password, size_t pass_len, + enum PW_Alg al); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_password>(thd, this); } +}; + + + +class Item_func_des_encrypt :public Item_str_binary_checksum_func +{ + String tmp_value,tmp_arg; +public: + Item_func_des_encrypt(THD *thd, Item *a) + :Item_str_binary_checksum_func(thd, a) {} + Item_func_des_encrypt(THD *thd, Item *a, Item *b) + :Item_str_binary_checksum_func(thd, a, b) {} + String *val_str(String *); + bool fix_length_and_dec() + { + maybe_null=1; + /* 9 = MAX ((8- (arg_len % 8)) + 1) */ + max_length = args[0]->max_length + 9; + return FALSE; + } + const char *func_name() const { return "des_encrypt"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_des_encrypt>(thd, this); } +}; + +class Item_func_des_decrypt :public Item_str_binary_checksum_func +{ + String tmp_value; +public: + Item_func_des_decrypt(THD *thd, Item *a) + :Item_str_binary_checksum_func(thd, a) {} + Item_func_des_decrypt(THD *thd, Item *a, Item *b) + :Item_str_binary_checksum_func(thd, a, b) {} + String *val_str(String *); + bool fix_length_and_dec() + { + maybe_null=1; + /* 9 = MAX ((8- (arg_len % 8)) + 1) */ + max_length= args[0]->max_length; + if (max_length >= 9U) + max_length-= 9U; + return FALSE; + } + const char *func_name() const { return "des_decrypt"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_des_decrypt>(thd, this); } +}; + + +/** + QQ: Item_func_encrypt should derive from Item_str_ascii_checksum_func. + However, it should be fixed to handle UCS2, UTF16, UTF32 properly first, + as the underlying crypt() call expects a null-terminated input string. +*/ +class Item_func_encrypt :public Item_str_binary_checksum_func +{ + String tmp_value; + + /* Encapsulate common constructor actions */ + void constructor_helper() + { + collation.set(&my_charset_bin); + } +public: + Item_func_encrypt(THD *thd, Item *a): Item_str_binary_checksum_func(thd, a) + { + constructor_helper(); + } + Item_func_encrypt(THD *thd, Item *a, Item *b) + :Item_str_binary_checksum_func(thd, a, b) + { + constructor_helper(); + } + String *val_str(String *); + bool fix_length_and_dec() { maybe_null=1; max_length = 13; return FALSE; } + const char *func_name() const { return "encrypt"; } + bool check_vcol_func_processor(void *arg) + { + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_encrypt>(thd, this); } +}; + +#include "sql_crypt.h" + + +class Item_func_encode :public Item_str_binary_checksum_func +{ +private: + /** Whether the PRNG has already been seeded. */ + bool seeded; +protected: + SQL_CRYPT sql_crypt; +public: + Item_func_encode(THD *thd, Item *a, Item *seed_arg): + Item_str_binary_checksum_func(thd, a, seed_arg) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "encode"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_encode>(thd, this); } +protected: + virtual void crypto_transform(String *); +private: + /** Provide a seed for the PRNG sequence. */ + bool seed(); +}; + + +class Item_func_decode :public Item_func_encode +{ +public: + Item_func_decode(THD *thd, Item *a, Item *seed_arg): Item_func_encode(thd, a, seed_arg) {} + const char *func_name() const { return "decode"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_decode>(thd, this); } +protected: + void crypto_transform(String *); +}; + + +class Item_func_sysconst :public Item_str_func +{ +public: + Item_func_sysconst(THD *thd): Item_str_func(thd) + { collation.set(system_charset_info,DERIVATION_SYSCONST); } + Item *safe_charset_converter(THD *thd, CHARSET_INFO *tocs); + /* + Used to create correct Item name in new converted item in + safe_charset_converter, return string representation of this function + call + */ + virtual const char *fully_qualified_func_name() const = 0; + bool check_vcol_func_processor(void *arg) + { + return mark_unsupported_function(fully_qualified_func_name(), arg, + VCOL_SESSION_FUNC); + } + bool const_item() const; +}; + + +class Item_func_database :public Item_func_sysconst +{ +public: + Item_func_database(THD *thd): Item_func_sysconst(thd) {} + String *val_str(String *); + bool fix_length_and_dec() + { + max_length= MAX_FIELD_NAME * system_charset_info->mbmaxlen; + maybe_null=1; + return FALSE; + } + const char *func_name() const { return "database"; } + const char *fully_qualified_func_name() const { return "database()"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_database>(thd, this); } +}; + + +class Item_func_sqlerrm :public Item_func_sysconst +{ +public: + Item_func_sqlerrm(THD *thd): Item_func_sysconst(thd) {} + String *val_str(String *); + const char *func_name() const { return "SQLERRM"; } + const char *fully_qualified_func_name() const { return "SQLERRM"; } + void print(String *str, enum_query_type query_type) + { + str->append(func_name()); + } + bool fix_length_and_dec() + { + max_length= 512 * system_charset_info->mbmaxlen; + null_value= maybe_null= false; + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_sqlerrm>(thd, this); } +}; + + +class Item_func_user :public Item_func_sysconst +{ +protected: + bool init (const char *user, const char *host); + +public: + Item_func_user(THD *thd): Item_func_sysconst(thd) + { + str_value.set("", 0, system_charset_info); + } + String *val_str(String *) + { + DBUG_ASSERT(fixed == 1); + return (null_value ? 0 : &str_value); + } + bool fix_fields(THD *thd, Item **ref); + bool fix_length_and_dec() + { + max_length= (uint32) (username_char_length + + HOSTNAME_LENGTH + 1) * SYSTEM_CHARSET_MBMAXLEN; + return FALSE; + } + const char *func_name() const { return "user"; } + const char *fully_qualified_func_name() const { return "user()"; } + int save_in_field(Field *field, bool no_conversions) + { + return save_str_value_in_field(field, &str_value); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_user>(thd, this); } +}; + + +class Item_func_current_user :public Item_func_user +{ + Name_resolution_context *context; + +public: + Item_func_current_user(THD *thd, Name_resolution_context *context_arg): + Item_func_user(thd), context(context_arg) {} + bool fix_fields(THD *thd, Item **ref); + const char *func_name() const { return "current_user"; } + const char *fully_qualified_func_name() const { return "current_user()"; } + bool check_vcol_func_processor(void *arg) + { + context= 0; + return mark_unsupported_function(fully_qualified_func_name(), arg, + VCOL_SESSION_FUNC); + } +}; + + +class Item_func_current_role :public Item_func_sysconst +{ + Name_resolution_context *context; + +public: + Item_func_current_role(THD *thd, Name_resolution_context *context_arg): + Item_func_sysconst(thd), context(context_arg) {} + bool fix_fields(THD *thd, Item **ref); + bool fix_length_and_dec() + { + max_length= (uint32) username_char_length * SYSTEM_CHARSET_MBMAXLEN; + return FALSE; + } + int save_in_field(Field *field, bool no_conversions) + { return save_str_value_in_field(field, &str_value); } + const char *func_name() const { return "current_role"; } + const char *fully_qualified_func_name() const { return "current_role()"; } + String *val_str(String *) + { + DBUG_ASSERT(fixed == 1); + return null_value ? NULL : &str_value; + } + bool check_vcol_func_processor(void *arg) + { + + context= 0; + return mark_unsupported_function(fully_qualified_func_name(), arg, + VCOL_SESSION_FUNC); + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_current_role>(thd, this); } +}; + + +class Item_func_soundex :public Item_str_func +{ + String tmp_value; +public: + Item_func_soundex(THD *thd, Item *a): Item_str_func(thd, a) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "soundex"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_soundex>(thd, this); } +}; + + +class Item_func_elt :public Item_str_func +{ +public: + Item_func_elt(THD *thd, List<Item> &list): Item_str_func(thd, list) {} + double val_real(); + longlong val_int(); + String *val_str(String *str); + bool fix_length_and_dec(); + const char *func_name() const { return "elt"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_elt>(thd, this); } +}; + + +class Item_func_make_set :public Item_str_func +{ + String tmp_str; + +public: + Item_func_make_set(THD *thd, List<Item> &list): Item_str_func(thd, list) {} + String *val_str(String *str); + bool fix_length_and_dec(); + const char *func_name() const { return "make_set"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_make_set>(thd, this); } +}; + + +class Item_func_format :public Item_str_ascii_func +{ + const MY_LOCALE *locale; +public: + Item_func_format(THD *thd, Item *org, Item *dec): + Item_str_ascii_func(thd, org, dec) {} + Item_func_format(THD *thd, Item *org, Item *dec, Item *lang): + Item_str_ascii_func(thd, org, dec, lang) {} + + String *val_str_ascii(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "format"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_format>(thd, this); } +}; + + +class Item_func_char :public Item_str_func +{ +public: + Item_func_char(THD *thd, List<Item> &list): Item_str_func(thd, list) + { collation.set(&my_charset_bin); } + Item_func_char(THD *thd, List<Item> &list, CHARSET_INFO *cs): + Item_str_func(thd, list) + { collation.set(cs); } + Item_func_char(THD *thd, Item *arg1, CHARSET_INFO *cs): + Item_str_func(thd, arg1) + { collation.set(cs); } + String *val_str(String *); + void append_char(String * str, int32 num); + bool fix_length_and_dec() + { + max_length= arg_count * 4; + return FALSE; + } + const char *func_name() const { return "char"; } + void print(String *str, enum_query_type query_type); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_char>(thd, this); } +}; + +class Item_func_chr :public Item_func_char +{ +public: + Item_func_chr(THD *thd, Item *arg1, CHARSET_INFO *cs): + Item_func_char(thd, arg1, cs) {} + String *val_str(String *); + bool fix_length_and_dec() + { + max_length= 4; + return FALSE; + } + const char *func_name() const { return "chr"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_chr>(thd, this); } +}; + +class Item_func_repeat :public Item_str_func +{ + String tmp_value; +public: + Item_func_repeat(THD *thd, Item *arg1, Item *arg2): + Item_str_func(thd, arg1, arg2) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "repeat"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_repeat>(thd, this); } +}; + + +class Item_func_space :public Item_str_func +{ +public: + Item_func_space(THD *thd, Item *arg1): Item_str_func(thd, arg1) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "space"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_space>(thd, this); } +}; + + +class Item_func_binlog_gtid_pos :public Item_str_func +{ +public: + Item_func_binlog_gtid_pos(THD *thd, Item *arg1, Item *arg2): + Item_str_func(thd, arg1, arg2) {} + String *val_str(String *); + bool fix_length_and_dec(); + const char *func_name() const { return "binlog_gtid_pos"; } + 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_binlog_gtid_pos>(thd, this); } +}; + + +class Item_func_pad: public Item_str_func +{ +protected: + String tmp_value, pad_str; +public: + Item_func_pad(THD *thd, Item *arg1, Item *arg2, Item *arg3): + Item_str_func(thd, arg1, arg2, arg3) {} + Item_func_pad(THD *thd, Item *arg1, Item *arg2): + Item_str_func(thd, arg1, arg2) {} + bool fix_length_and_dec(); +}; + + +class Item_func_rpad :public Item_func_pad +{ +public: + Item_func_rpad(THD *thd, Item *arg1, Item *arg2, Item *arg3): + Item_func_pad(thd, arg1, arg2, arg3) {} + Item_func_rpad(THD *thd, Item *arg1, Item *arg2): + Item_func_pad(thd, arg1, arg2) {} + String *val_str(String *); + const char *func_name() const { return "rpad"; } + Sql_mode_dependency value_depends_on_sql_mode() const; + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_rpad>(thd, this); } +}; + + +class Item_func_rpad_oracle :public Item_func_rpad +{ + String *make_empty_result() + { null_value= 1; return NULL; } +public: + Item_func_rpad_oracle(THD *thd, Item *arg1, Item *arg2, Item *arg3): + Item_func_rpad(thd, arg1, arg2, arg3) {} + Item_func_rpad_oracle(THD *thd, Item *arg1, Item *arg2): + Item_func_rpad(thd, arg1, arg2) {} + bool fix_length_and_dec() + { + bool res= Item_func_rpad::fix_length_and_dec(); + maybe_null= true; + return res; + } + const char *func_name() const { return "rpad_oracle"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_rpad_oracle>(thd, this); } +}; + + +class Item_func_lpad :public Item_func_pad +{ +public: + Item_func_lpad(THD *thd, Item *arg1, Item *arg2, Item *arg3): + Item_func_pad(thd, arg1, arg2, arg3) {} + Item_func_lpad(THD *thd, Item *arg1, Item *arg2): + Item_func_pad(thd, arg1, arg2) {} + String *val_str(String *); + const char *func_name() const { return "lpad"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_lpad>(thd, this); } +}; + + +class Item_func_lpad_oracle :public Item_func_lpad +{ + String *make_empty_result() + { null_value= 1; return NULL; } +public: + Item_func_lpad_oracle(THD *thd, Item *arg1, Item *arg2, Item *arg3): + Item_func_lpad(thd, arg1, arg2, arg3) {} + Item_func_lpad_oracle(THD *thd, Item *arg1, Item *arg2): + Item_func_lpad(thd, arg1, arg2) {} + bool fix_length_and_dec() + { + bool res= Item_func_lpad::fix_length_and_dec(); + maybe_null= true; + return res; + } + const char *func_name() const { return "lpad_oracle"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_lpad_oracle>(thd, this); } +}; + + +class Item_func_conv :public Item_str_func +{ +public: + Item_func_conv(THD *thd, Item *a, Item *b, Item *c): + Item_str_func(thd, a, b, c) {} + const char *func_name() const { return "conv"; } + String *val_str(String *); + bool fix_length_and_dec() + { + collation.set(default_charset()); + fix_char_length(64); + maybe_null= 1; + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_conv>(thd, this); } +}; + + +class Item_func_hex :public Item_str_ascii_checksum_func +{ +protected: + String tmp_value; + /* + Calling arg[0]->type_handler() can be expensive on every row. + It's a virtual method, and in case if args[0] is a complex Item, + its type_handler() can call more virtual methods. + So let's cache it during fix_length_and_dec(). + */ + const Type_handler *m_arg0_type_handler; +public: + Item_func_hex(THD *thd, Item *a): + Item_str_ascii_checksum_func(thd, a), m_arg0_type_handler(NULL) {} + const char *func_name() const { return "hex"; } + String *val_str_ascii_from_val_int(String *str); + String *val_str_ascii_from_val_real(String *str); + String *val_str_ascii_from_val_str(String *str); + String *val_str_ascii(String *str) + { + DBUG_ASSERT(fixed); + return m_arg0_type_handler->Item_func_hex_val_str_ascii(this, str); + } + bool fix_length_and_dec() + { + collation.set(default_charset(), DERIVATION_COERCIBLE, MY_REPERTOIRE_ASCII); + decimals=0; + fix_char_length(args[0]->max_length * 2); + m_arg0_type_handler= args[0]->type_handler(); + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_hex>(thd, this); } +}; + +class Item_func_unhex :public Item_str_func +{ + String tmp_value; +public: + Item_func_unhex(THD *thd, Item *a): Item_str_func(thd, a) + { + /* there can be bad hex strings */ + maybe_null= 1; + } + const char *func_name() const { return "unhex"; } + String *val_str(String *); + bool fix_length_and_dec() + { + collation.set(&my_charset_bin); + decimals=0; + max_length=(1+args[0]->max_length)/2; + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_unhex>(thd, this); } +}; + + +#ifndef DBUG_OFF +class Item_func_like_range :public Item_str_func +{ +protected: + String min_str; + String max_str; + const bool is_min; +public: + Item_func_like_range(THD *thd, Item *a, Item *b, bool is_min_arg): + Item_str_func(thd, a, b), is_min(is_min_arg) + { maybe_null= 1; } + String *val_str(String *); + bool fix_length_and_dec() + { + collation.set(args[0]->collation); + decimals=0; + max_length= MAX_BLOB_WIDTH; + return FALSE; + } +}; + + +class Item_func_like_range_min :public Item_func_like_range +{ +public: + Item_func_like_range_min(THD *thd, Item *a, Item *b): + Item_func_like_range(thd, a, b, true) { } + const char *func_name() const { return "like_range_min"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_like_range_min>(thd, this); } +}; + + +class Item_func_like_range_max :public Item_func_like_range +{ +public: + Item_func_like_range_max(THD *thd, Item *a, Item *b): + Item_func_like_range(thd, a, b, false) { } + const char *func_name() const { return "like_range_max"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_like_range_max>(thd, this); } +}; +#endif + + +class Item_func_binary :public Item_str_func +{ +public: + Item_func_binary(THD *thd, Item *a): Item_str_func(thd, a) {} + String *val_str(String *a) + { + DBUG_ASSERT(fixed == 1); + String *tmp=args[0]->val_str(a); + null_value=args[0]->null_value; + if (tmp) + tmp->set_charset(&my_charset_bin); + return tmp; + } + bool fix_length_and_dec() + { + collation.set(&my_charset_bin); + max_length=args[0]->max_length; + return FALSE; + } + void print(String *str, enum_query_type query_type); + const char *func_name() const { return "cast_as_binary"; } + bool need_parentheses_in_default() { return true; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_binary>(thd, this); } +}; + + +class Item_load_file :public Item_str_func +{ + String tmp_value; +public: + Item_load_file(THD *thd, Item *a): Item_str_func(thd, a) {} + String *val_str(String *); + const char *func_name() const { return "load_file"; } + bool fix_length_and_dec() + { + collation.set(&my_charset_bin, DERIVATION_COERCIBLE); + maybe_null=1; + max_length=MAX_BLOB_WIDTH; + 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_load_file>(thd, this); } +}; + + +class Item_func_export_set: public Item_str_func +{ + public: + Item_func_export_set(THD *thd, Item *a, Item *b, Item* c): + Item_str_func(thd, a, b, c) {} + Item_func_export_set(THD *thd, Item *a, Item *b, Item* c, Item* d): + Item_str_func(thd, a, b, c, d) {} + Item_func_export_set(THD *thd, Item *a, Item *b, Item* c, Item* d, Item* e): + Item_str_func(thd, a, b, c, d, e) {} + String *val_str(String *str); + bool fix_length_and_dec(); + const char *func_name() const { return "export_set"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_export_set>(thd, this); } +}; + + +class Item_func_quote :public Item_str_func +{ + String tmp_value; +public: + Item_func_quote(THD *thd, Item *a): Item_str_func(thd, a) {} + const char *func_name() const { return "quote"; } + String *val_str(String *); + bool fix_length_and_dec() + { + collation.set(args[0]->collation); + ulonglong max_result_length= (ulonglong) args[0]->max_length * 2 + + 2 * collation.collation->mbmaxlen; + max_length= (uint32) MY_MIN(max_result_length, MAX_BLOB_WIDTH); + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_quote>(thd, this); } +}; + +class Item_func_conv_charset :public Item_str_func +{ + bool use_cached_value; + String tmp_value; +public: + bool safe; + Item_func_conv_charset(THD *thd, Item *a, CHARSET_INFO *cs): + Item_str_func(thd, a) + { + collation.set(cs, DERIVATION_IMPLICIT); + use_cached_value= 0; safe= 0; + } + Item_func_conv_charset(THD *thd, Item *a, CHARSET_INFO *cs, bool cache_if_const): + Item_str_func(thd, a) + { + collation.set(cs, DERIVATION_IMPLICIT); + if (cache_if_const && args[0]->const_item() && !args[0]->is_expensive()) + { + uint errors= 0; + String tmp, *str= args[0]->val_str(&tmp); + if (!str || str_value.copy(str->ptr(), str->length(), + str->charset(), cs, &errors)) + null_value= 1; + use_cached_value= 1; + str_value.mark_as_const(); + safe= (errors == 0); + } + else + { + use_cached_value= 0; + /* + Conversion from and to "binary" is safe. + Conversion to Unicode is safe. + Conversion from an expression with the ASCII repertoire + to any character set that can store characters U+0000..U+007F + is safe: + - All supported multibyte character sets can store U+0000..U+007F + - All supported 7bit character sets can store U+0000..U+007F + except those marked with MY_CS_NONASCII (e.g. swe7). + Other kind of conversions are potentially lossy. + */ + safe= (args[0]->collation.collation == &my_charset_bin || + cs == &my_charset_bin || + (cs->state & MY_CS_UNICODE) || + (args[0]->collation.repertoire == MY_REPERTOIRE_ASCII && + (cs->mbmaxlen > 1 || !(cs->state & MY_CS_NONASCII)))); + } + } + bool is_json_type() { return args[0]->is_json_type(); } + String *val_str(String *); + longlong val_int() + { + if (args[0]->result_type() == STRING_RESULT) + return Item_str_func::val_int(); + longlong res= args[0]->val_int(); + if ((null_value= args[0]->null_value)) + return 0; + return res; + } + double val_real() + { + if (args[0]->result_type() == STRING_RESULT) + return Item_str_func::val_real(); + double res= args[0]->val_real(); + if ((null_value= args[0]->null_value)) + return 0; + return res; + } + my_decimal *val_decimal(my_decimal *d) + { + if (args[0]->result_type() == STRING_RESULT) + return Item_str_func::val_decimal(d); + my_decimal *res= args[0]->val_decimal(d); + if ((null_value= args[0]->null_value)) + return NULL; + return res; + } + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) + { + if (args[0]->result_type() == STRING_RESULT) + return Item_str_func::get_date(thd, ltime, fuzzydate); + bool res= args[0]->get_date(thd, ltime, fuzzydate); + if ((null_value= args[0]->null_value)) + return 1; + return res; + } + bool fix_length_and_dec(); + const char *func_name() const { return "convert"; } + void print(String *str, enum_query_type query_type); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_conv_charset>(thd, this); } +}; + +class Item_func_set_collation :public Item_str_func +{ + CHARSET_INFO *m_set_collation; +public: + Item_func_set_collation(THD *thd, Item *a, CHARSET_INFO *set_collation): + Item_str_func(thd, a), m_set_collation(set_collation) {} + String *val_str(String *); + bool fix_length_and_dec(); + bool eq(const Item *item, bool binary_cmp) const; + const char *func_name() const { return "collate"; } + enum precedence precedence() const { return COLLATE_PRECEDENCE; } + enum Functype functype() const { return COLLATE_FUNC; } + void print(String *str, enum_query_type query_type); + Item_field *field_for_view_update() + { + /* this function is transparent for view updating */ + return args[0]->field_for_view_update(); + } + bool need_parentheses_in_default() { return true; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_set_collation>(thd, this); } +}; + + +class Item_func_expr_str_metadata :public Item_str_func +{ +public: + Item_func_expr_str_metadata(THD *thd, Item *a): Item_str_func(thd, a) { } + bool fix_length_and_dec() + { + collation.set(system_charset_info); + max_length= 64 * collation.collation->mbmaxlen; // should be enough + maybe_null= 0; + return FALSE; + }; + table_map not_null_tables() const { return 0; } + Item* propagate_equal_fields(THD *thd, const Context &ctx, COND_EQUAL *cond) + { return this; } + bool const_item() const { return true; } +}; + + +class Item_func_charset :public Item_func_expr_str_metadata +{ +public: + Item_func_charset(THD *thd, Item *a) + :Item_func_expr_str_metadata(thd, a) { } + String *val_str(String *); + const char *func_name() const { return "charset"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_charset>(thd, this); } +}; + + +class Item_func_collation :public Item_func_expr_str_metadata +{ +public: + Item_func_collation(THD *thd, Item *a) + :Item_func_expr_str_metadata(thd, a) {} + String *val_str(String *); + const char *func_name() const { return "collation"; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_collation>(thd, this); } +}; + + +class Item_func_weight_string :public Item_str_func +{ + String tmp_value; + uint flags; + uint nweights; + uint result_length; +public: + Item_func_weight_string(THD *thd, Item *a, uint result_length_arg, + uint nweights_arg, uint flags_arg): + Item_str_func(thd, a) + { + nweights= nweights_arg; + flags= flags_arg; + result_length= result_length_arg; + } + const char *func_name() const { return "weight_string"; } + String *val_str(String *); + bool fix_length_and_dec(); + bool eq(const Item *item, bool binary_cmp) const + { + if (!Item_str_func::eq(item, binary_cmp)) + return false; + Item_func_weight_string *that= (Item_func_weight_string *)item; + return this->flags == that->flags && + this->nweights == that->nweights && + this->result_length == that->result_length; + } + Item* propagate_equal_fields(THD *thd, const Context &ctx, COND_EQUAL *cond) + { return this; } + void print(String *str, enum_query_type query_type); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_weight_string>(thd, this); } +}; + +class Item_func_crc32 :public Item_long_func +{ + bool check_arguments() const + { return args[0]->check_type_can_return_str(func_name()); } + String value; +public: + Item_func_crc32(THD *thd, Item *a): Item_long_func(thd, a) + { unsigned_flag= 1; } + const char *func_name() const { return "crc32"; } + bool fix_length_and_dec() { max_length=10; return FALSE; } + longlong val_int(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_crc32>(thd, this); } +}; + +class Item_func_uncompressed_length : public Item_long_func_length +{ + String value; +public: + Item_func_uncompressed_length(THD *thd, Item *a) + :Item_long_func_length(thd, a) {} + const char *func_name() const{return "uncompressed_length";} + bool fix_length_and_dec() { max_length=10; maybe_null= true; return FALSE; } + longlong val_int(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_uncompressed_length>(thd, this); } +}; + +#ifdef HAVE_COMPRESS +#define ZLIB_DEPENDED_FUNCTION ; +#else +#define ZLIB_DEPENDED_FUNCTION { null_value=1; return 0; } +#endif + +class Item_func_compress: public Item_str_binary_checksum_func +{ + String tmp_value; +public: + Item_func_compress(THD *thd, Item *a) + :Item_str_binary_checksum_func(thd, a) {} + bool fix_length_and_dec() + { + max_length= (args[0]->max_length * 120) / 100 + 12; + return FALSE; + } + const char *func_name() const{return "compress";} + String *val_str(String *) ZLIB_DEPENDED_FUNCTION + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_compress>(thd, this); } +}; + +class Item_func_uncompress: public Item_str_binary_checksum_func +{ + String tmp_value; +public: + Item_func_uncompress(THD *thd, Item *a) + :Item_str_binary_checksum_func(thd, a) {} + bool fix_length_and_dec() + { + maybe_null= 1; max_length= MAX_BLOB_WIDTH; + return FALSE; + } + const char *func_name() const{return "uncompress";} + String *val_str(String *) ZLIB_DEPENDED_FUNCTION + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_uncompress>(thd, this); } +}; + + +class Item_func_uuid: public Item_str_func +{ +public: + Item_func_uuid(THD *thd): Item_str_func(thd) {} + bool fix_length_and_dec() + { + collation.set(DTCollation_numeric()); + fix_char_length(MY_UUID_STRING_LENGTH); + return FALSE; + } + bool const_item() const { return false; } + table_map used_tables() const { return RAND_TABLE_BIT; } + const char *func_name() const{ return "uuid"; } + String *val_str(String *); + 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>(thd, this); } +}; + + +class Item_func_dyncol_create: public Item_str_func +{ +protected: + DYNCALL_CREATE_DEF *defs; + DYNAMIC_COLUMN_VALUE *vals; + uint *keys_num; + LEX_STRING *keys_str; + bool names, force_names; + bool prepare_arguments(THD *thd, bool force_names); + void print_arguments(String *str, enum_query_type query_type); +public: + Item_func_dyncol_create(THD *thd, List<Item> &args, DYNCALL_CREATE_DEF *dfs); + bool fix_fields(THD *thd, Item **ref); + bool fix_length_and_dec(); + const char *func_name() const{ return "column_create"; } + String *val_str(String *); + void print(String *str, enum_query_type query_type); + enum Functype functype() const { return DYNCOL_FUNC; } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_dyncol_create>(thd, this); } +}; + + +class Item_func_dyncol_add: public Item_func_dyncol_create +{ +public: + Item_func_dyncol_add(THD *thd, List<Item> &args_arg, DYNCALL_CREATE_DEF *dfs): + Item_func_dyncol_create(thd, args_arg, dfs) + {} + const char *func_name() const{ return "column_add"; } + String *val_str(String *); + void print(String *str, enum_query_type query_type); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_dyncol_add>(thd, this); } +}; + +class Item_func_dyncol_json: public Item_str_func +{ +public: + Item_func_dyncol_json(THD *thd, Item *str): Item_str_func(thd, str) + {collation.set(DYNCOL_UTF);} + const char *func_name() const{ return "column_json"; } + String *val_str(String *); + bool fix_length_and_dec() + { + max_length= MAX_BLOB_WIDTH; + maybe_null= 1; + decimals= 0; + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_dyncol_json>(thd, this); } +}; + +/* + The following functions is always called from an Item_cast function +*/ + +class Item_dyncol_get: public Item_str_func +{ +public: + Item_dyncol_get(THD *thd, Item *str, Item *num): Item_str_func(thd, str, num) + {} + bool fix_length_and_dec() + { maybe_null= 1;; max_length= MAX_BLOB_WIDTH; return FALSE; } + /* Mark that collation can change between calls */ + bool dynamic_result() { return 1; } + + const char *func_name() const { return "column_get"; } + String *val_str(String *); + longlong val_int(); + longlong val_int_signed_typecast() + { + unsigned_flag= false; // Mark that we want to have a signed value + longlong value= val_int(); // val_int() can change unsigned_flag + if (!null_value && unsigned_flag && value < 0) + push_note_converted_to_negative_complement(current_thd); + return value; + } + longlong val_int_unsigned_typecast() + { + unsigned_flag= true; // Mark that we want to have an unsigned value + longlong value= val_int(); // val_int() can change unsigned_flag + if (!null_value && unsigned_flag == 0 && value < 0) + push_note_converted_to_positive_complement(current_thd); + return value; + } + double val_real(); + my_decimal *val_decimal(my_decimal *); + bool get_dyn_value(THD *thd, DYNAMIC_COLUMN_VALUE *val, String *tmp); + bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate); + void print(String *str, enum_query_type query_type); + Item *get_copy(THD *thd) + { return get_item_copy<Item_dyncol_get>(thd, this); } +}; + + +class Item_func_dyncol_list: public Item_str_func +{ +public: + Item_func_dyncol_list(THD *thd, Item *str): Item_str_func(thd, str) + {collation.set(DYNCOL_UTF);} + bool fix_length_and_dec() + { maybe_null= 1; max_length= MAX_BLOB_WIDTH; return FALSE; }; + const char *func_name() const{ return "column_list"; } + String *val_str(String *); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_dyncol_list>(thd, this); } +}; + +/* + this is used by JOIN_TAB::keep_current_rowid + and stores handler::position(). + It has nothing to do with _rowid pseudo-column, that the parser supports. +*/ +class Item_temptable_rowid :public Item_str_func +{ +public: + TABLE *table; + Item_temptable_rowid(TABLE *table_arg); + const Type_handler *type_handler() const { return &type_handler_string; } + Field *create_tmp_field(MEM_ROOT *root, bool group, TABLE *table) + { return create_table_field_from_handler(root, table); } + String *val_str(String *str); + enum Functype functype() const { return TEMPTABLE_ROWID; } + const char *func_name() const { return "<rowid>"; } + bool fix_length_and_dec(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_temptable_rowid>(thd, this); } +}; +#ifdef WITH_WSREP + +#include "wsrep_api.h" + +class Item_func_wsrep_last_written_gtid: public Item_str_ascii_func +{ + String gtid_str; +public: + Item_func_wsrep_last_written_gtid(THD *thd): Item_str_ascii_func(thd) {} + const char *func_name() const { return "wsrep_last_written_gtid"; } + String *val_str_ascii(String *); + bool fix_length_and_dec() + { + max_length= WSREP_GTID_STR_LEN; + maybe_null= true; + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_wsrep_last_written_gtid>(thd, this); } +}; + +class Item_func_wsrep_last_seen_gtid: public Item_str_ascii_func +{ + String gtid_str; +public: + Item_func_wsrep_last_seen_gtid(THD *thd): Item_str_ascii_func(thd) {} + const char *func_name() const { return "wsrep_last_seen_gtid"; } + String *val_str_ascii(String *); + bool fix_length_and_dec() + { + max_length= WSREP_GTID_STR_LEN; + maybe_null= true; + return FALSE; + } + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_wsrep_last_seen_gtid>(thd, this); } +}; + +class Item_func_wsrep_sync_wait_upto: public Item_int_func +{ + String value; +public: + Item_func_wsrep_sync_wait_upto(THD *thd, Item *a): Item_int_func(thd, a) {} + Item_func_wsrep_sync_wait_upto(THD *thd, Item *a, Item* b): Item_int_func(thd, a, b) {} + const Type_handler *type_handler() const { return &type_handler_string; } + const char *func_name() const { return "wsrep_sync_wait_upto_gtid"; } + longlong val_int(); + Item *get_copy(THD *thd) + { return get_item_copy<Item_func_wsrep_sync_wait_upto>(thd, this); } +}; +#endif /* WITH_WSREP */ + +#endif /* ITEM_STRFUNC_INCLUDED */ |