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item_strfunc.h
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#ifndef ITEM_STRFUNC_INCLUDED #define ITEM_STRFUNC_INCLUDED /* Copyright (c) 2000, 2011, Oracle and/or its affiliates. Copyright (c) 2009, 2021, 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(String *str) { /* 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->is_alloced()) str->set("", 0, collation.collation); /* Avoid null ptrs */ else { str->length(0); /* Reuse allocated area */ str->set_charset(collation.collation); } return str; } 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() override; double val_real() override; my_decimal *val_decimal(my_decimal *) override; bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) override { return get_date_from_string(thd, ltime, fuzzydate); } const Type_handler *type_handler() const override { return string_type_handler(); } void left_right_max_length(); bool fix_fields(THD *thd, Item **ref) override; }; /* 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) override { return val_str_from_val_str_ascii(str, &ascii_buf); } String *val_str_ascii(String *) override= 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 override { // 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 override { /* 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 *) override; bool fix_length_and_dec() override { fix_length_and_charset(32, default_charset()); return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("md5") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("sha") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("sha2") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("to_base64") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("from_base64") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; }; 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() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("aes_encrypt") }; return name; } Item *do_get_copy(THD *thd) const override { 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() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("aes_decrypt") }; return name; } Item *do_get_copy(THD *thd) const override { 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) {} const Schema *schema() const override { return &mariadb_schema; } void print(String *str, enum_query_type query_type) override { print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } String *val_str(String *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("concat") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; const Schema *schema() const override { return &oracle_schema_ref; } void print(String *str, enum_query_type query_type) override { if (query_type & QT_FOR_FRM) { // 10.3 downgrade compatibility for FRM str->append(STRING_WITH_LEN("concat_operator_oracle")); } else print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override { collation.set(system_charset_info); max_length= MAX_BLOB_WIDTH; set_maybe_null(); return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("decode_histogram") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("concat_ws") }; return name; } table_map not_null_tables() const override { return 0; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("reverse") }; return name; } Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_reverse>(thd, this); } }; class Item_func_replace :public Item_str_func { String tmp_value,tmp_value2; protected: String *val_str_internal(String *str, bool null_to_empty); public: Item_func_replace(THD *thd, Item *org, Item *find, Item *replace): Item_str_func(thd, org, find, replace) {} String *val_str(String *to) override { return val_str_internal(to, false); }; bool fix_length_and_dec() override; const Schema *schema() const override { return &mariadb_schema; } void print(String *str, enum_query_type query_type) override { print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("replace") }; return name; } Item *do_get_copy(THD *thd) const override { 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) override { return val_str_internal(to, true); }; const Schema *schema() const override { return &oracle_schema_ref; } void print(String *str, enum_query_type query_type) override { if (query_type & QT_FOR_FRM) { // 10.3 downgrade compatibility for FRM str->append(STRING_WITH_LEN("replace_oracle")); } else print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } Item *do_get_copy(THD *thd) const override { 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); protected: String *val_str_internal(String *str, bool null_to_empty); public: Item_func_regexp_replace(THD *thd, Item *a, Item *b, Item *c): Item_str_func(thd, a, b, c) {} const Schema *schema() const override { return &mariadb_schema; } void print(String *str, enum_query_type query_type) override { print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } void cleanup() override { DBUG_ENTER("Item_func_regexp_replace::cleanup"); Item_str_func::cleanup(); re.cleanup(); DBUG_VOID_RETURN; } String *val_str(String *str) override { return val_str_internal(str, false); } bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("regexp_replace") }; return name; } Item *do_get_copy(THD *thd) const override { return 0;} }; class Item_func_regexp_replace_oracle: public Item_func_regexp_replace { public: Item_func_regexp_replace_oracle(THD *thd, Item *a, Item *b, Item *c) :Item_func_regexp_replace(thd, a, b, c) {} const Schema *schema() const override { return &oracle_schema_ref; } bool fix_length_and_dec() override { bool rc= Item_func_regexp_replace::fix_length_and_dec(); set_maybe_null(); // Empty result is converted to NULL return rc; } String *val_str(String *str) override { return val_str_internal(str, true); } }; 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() override { DBUG_ENTER("Item_func_regexp_substr::cleanup"); Item_str_func::cleanup(); re.cleanup(); DBUG_VOID_RETURN; } String *val_str(String *str) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("regexp_substr") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("insert") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; }; class Item_func_lcase :public Item_str_conv { public: Item_func_lcase(THD *thd, Item *item): Item_str_conv(thd, item) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("lcase") }; return name; } bool fix_length_and_dec() override; Item *do_get_copy(THD *thd) const override { 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) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("ucase") }; return name; } bool fix_length_and_dec() override; Item *do_get_copy(THD *thd) const override { 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) {} bool hash_not_null(Hasher *hasher) override; String *val_str(String *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("left") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("right") }; return name; } Item *do_get_copy(THD *thd) const override { 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) {} Item_func_substr(THD *thd, List<Item> &list) :Item_str_func(thd, list) {} String *val_str(String *) override; bool fix_length_and_dec() override; const Schema *schema() const override { return &mariadb_schema; } void print(String *str, enum_query_type query_type) override { print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("substr") }; return name; } Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_substr>(thd, this); } }; class Item_func_substr_oracle :public Item_func_substr { protected: longlong get_position() override { longlong pos= args[1]->val_int(); return pos == 0 ? 1 : pos; } String *make_empty_result(String *str) override { 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) {} Item_func_substr_oracle(THD *thd, List<Item> &list) :Item_func_substr(thd, list) {} bool fix_length_and_dec() override { bool res= Item_func_substr::fix_length_and_dec(); set_maybe_null(); return res; } const Schema *schema() const override { return &oracle_schema_ref; } void print(String *str, enum_query_type query_type) override { if (query_type & QT_FOR_FRM) { // 10.3 downgrade compatibility for FRM str->append(STRING_WITH_LEN("substr_oracle")); } else print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("substring_index") }; return name; } Item *do_get_copy(THD *thd) const override { 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); 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()); } 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 override; String *val_str(String *) override; bool fix_length_and_dec() override; const Schema *schema() const override { return &mariadb_schema; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("trim") }; return name; } void print(String *str, enum_query_type query_type) override; virtual LEX_CSTRING mode_name() const { return { "both", 4}; } Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_trim>(thd, this); } }; class Item_func_trim_oracle :public Item_func_trim { protected: String *make_empty_result(String *str) override { null_value= 1; return NULL; } 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 Schema *schema() const override { return &oracle_schema_ref; } bool fix_length_and_dec() override { bool res= Item_func_trim::fix_length_and_dec(); set_maybe_null(); return res; } Item *do_get_copy(THD *thd) const override { 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 override { return Item_func::value_depends_on_sql_mode(); } String *val_str(String *) override; const Schema *schema() const override { return &mariadb_schema; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("ltrim") }; return name; } LEX_CSTRING mode_name() const override { return { STRING_WITH_LEN("leading") }; } Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_ltrim>(thd, this); } }; class Item_func_ltrim_oracle :public Item_func_ltrim { protected: String *make_empty_result(String *str) override { null_value= 1; return NULL; } 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 Schema *schema() const override { return &oracle_schema_ref; } bool fix_length_and_dec() override { bool res= Item_func_ltrim::fix_length_and_dec(); set_maybe_null(); return res; } Item *do_get_copy(THD *thd) const override { 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 *) override; const Schema *schema() const override { return &mariadb_schema; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("rtrim") }; return name; } LEX_CSTRING mode_name() const override { return { STRING_WITH_LEN("trailing") }; } Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_rtrim>(thd, this); } }; class Item_func_rtrim_oracle :public Item_func_rtrim { protected: String *make_empty_result(String *str) override { null_value= 1; return NULL; } 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 Schema *schema() const override { return &oracle_schema_ref; } bool fix_length_and_dec() override { bool res= Item_func_rtrim::fix_length_and_dec(); set_maybe_null(); return res; } Item *do_get_copy(THD *thd) const override { 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) override; bool fix_fields(THD *thd, Item **ref) override; bool fix_length_and_dec() override { fix_length_and_charset((alg == 1 ? SCRAMBLED_PASSWORD_CHAR_LENGTH : SCRAMBLED_PASSWORD_CHAR_LENGTH_323), default_charset()); return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING password_normal= {STRING_WITH_LEN("password") }; static LEX_CSTRING password_old= {STRING_WITH_LEN("old_password") }; return (deflt || alg == 1) ? password_normal : password_old; } static char *alloc(THD *thd, const char *password, size_t pass_len, enum PW_Alg al); Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override { set_maybe_null(); /* 9 = MAX ((8- (arg_len % 8)) + 1) */ max_length = args[0]->max_length + 9; return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("des_encrypt") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override { set_maybe_null(); /* 9 = MAX ((8- (arg_len % 8)) + 1) */ max_length= args[0]->max_length; if (max_length >= 9U) max_length-= 9U; return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("des_decrypt") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override { set_maybe_null(); max_length = 13; return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("encrypt") }; return name; } bool check_vcol_func_processor(void *arg) override { return FALSE; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("encode") }; return name; } Item *do_get_copy(THD *thd) const override { 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 Schema *schema() const override { return &mariadb_schema; } void print(String *str, enum_query_type query_type) override { print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("decode") }; return name; } Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_decode>(thd, this); } protected: void crypto_transform(String *) override; }; 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) override; /* 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) override { return mark_unsupported_function(fully_qualified_func_name(), arg, VCOL_SESSION_FUNC); } bool const_item() const override; }; class Item_func_database :public Item_func_sysconst { public: Item_func_database(THD *thd): Item_func_sysconst(thd) {} String *val_str(String *) override; bool fix_length_and_dec() override { max_length= NAME_CHAR_LEN * system_charset_info->mbmaxlen; set_maybe_null(); return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("database") }; return name; } const char *fully_qualified_func_name() const override { return "database()"; } Item *do_get_copy(THD *thd) const override { 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 *) override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("SQLERRM") }; return name; } const char *fully_qualified_func_name() const override { return "SQLERRM"; } void print(String *str, enum_query_type query_type) override { str->append(func_name_cstring()); } bool fix_length_and_dec() override { max_length= 512 * system_charset_info->mbmaxlen; null_value= false; base_flags&= ~item_base_t::MAYBE_NULL; return FALSE; } Item *do_get_copy(THD *thd) const override { 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 *) override { DBUG_ASSERT(fixed()); return (null_value ? 0 : &str_value); } bool fix_fields(THD *thd, Item **ref) override; bool fix_length_and_dec() override { max_length= (uint32) (username_char_length + HOSTNAME_LENGTH + 1) * SYSTEM_CHARSET_MBMAXLEN; return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("user") }; return name; } const char *fully_qualified_func_name() const override { return "user()"; } int save_in_field(Field *field, bool no_conversions) override { return save_str_value_in_field(field, &str_value); } Item *do_get_copy(THD *thd) const override { 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) override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("current_user") }; return name; } const char *fully_qualified_func_name() const override { return "current_user()"; } bool check_vcol_func_processor(void *arg) override { 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) override; bool fix_length_and_dec() override { max_length= (uint32) username_char_length * SYSTEM_CHARSET_MBMAXLEN; return FALSE; } int save_in_field(Field *field, bool no_conversions) override { return save_str_value_in_field(field, &str_value); } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("current_role") }; return name; } const char *fully_qualified_func_name() const override { return "current_role()"; } String *val_str(String *) override { DBUG_ASSERT(fixed()); return null_value ? NULL : &str_value; } bool check_vcol_func_processor(void *arg) override { context= 0; return mark_unsupported_function(fully_qualified_func_name(), arg, VCOL_SESSION_FUNC); } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("soundex") }; return name; } Item *do_get_copy(THD *thd) const override { 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() override; longlong val_int() override; String *val_str(String *str) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("elt") }; return name; } Item *do_get_copy(THD *thd) const override { 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) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("make_set") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("format") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; void append_char(String * str, int32 num); bool fix_length_and_dec() override { max_length= arg_count * 4; return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("char") }; return name; } void print(String *str, enum_query_type query_type) override; Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override { max_length= 4; return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("chr") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("repeat") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("space") }; return name; } Item *do_get_copy(THD *thd) const override { 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 *) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("binlog_gtid_pos") }; return name; } bool check_vcol_func_processor(void *arg) override { return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); } Item *do_get_copy(THD *thd) const override { 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) {} Item_func_pad(THD *thd, List<Item> &list): Item_str_func(thd,list) {} bool fix_length_and_dec() override; }; 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) {} Item_func_rpad(THD *thd, List<Item> &list): Item_func_pad(thd,list) {} String *val_str(String *) override; const Schema *schema() const override { return &mariadb_schema; } void print(String *str, enum_query_type query_type) override { print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("rpad") }; return name; } Sql_mode_dependency value_depends_on_sql_mode() const override; Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_rpad>(thd, this); } }; class Item_func_rpad_oracle :public Item_func_rpad { String *make_empty_result(String *str) override { 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) {} Item_func_rpad_oracle(THD *thd, List<Item> &list): Item_func_rpad(thd,list) {} bool fix_length_and_dec() override { bool res= Item_func_rpad::fix_length_and_dec(); set_maybe_null(); return res; } const Schema *schema() const override { return &oracle_schema_ref; } void print(String *str, enum_query_type query_type) override { if (query_type & QT_FOR_FRM) { // 10.3 downgrade compatibility for FRM str->append(STRING_WITH_LEN("rpad_oracle")); } else print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } Item *do_get_copy(THD *thd) const override { 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) {} Item_func_lpad(THD *thd, List<Item> &list): Item_func_pad(thd,list) {} String *val_str(String *) override; const Schema *schema() const override { return &mariadb_schema; } void print(String *str, enum_query_type query_type) override { print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("lpad") }; return name; } Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_lpad>(thd, this); } }; class Item_func_lpad_oracle :public Item_func_lpad { String *make_empty_result(String *str) override { 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) {} Item_func_lpad_oracle(THD *thd, List<Item> &list): Item_func_lpad(thd,list) {} bool fix_length_and_dec() override { bool res= Item_func_lpad::fix_length_and_dec(); set_maybe_null(); return res; } const Schema *schema() const override { return &oracle_schema_ref; } void print(String *str, enum_query_type query_type) override { if (query_type & QT_FOR_FRM) { // 10.3 downgrade compatibility for FRM str->append(STRING_WITH_LEN("lpad_oracle")); } else print_sql_mode_qualified_name(str, query_type); print_args_parenthesized(str, query_type); } Item *do_get_copy(THD *thd) const override { 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) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("conv") }; return name; } String *val_str(String *) override; bool fix_length_and_dec() override { collation.set(default_charset()); fix_char_length(64); set_maybe_null(); return FALSE; } Item *do_get_copy(THD *thd) const override { 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) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("hex") }; return name; } 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) override { DBUG_ASSERT(fixed()); return m_arg0_type_handler->Item_func_hex_val_str_ascii(this, str); } bool fix_length_and_dec() override { m_arg0_type_handler= args[0]->type_handler(); collation.set(default_charset(), DERIVATION_COERCIBLE, MY_REPERTOIRE_ASCII); decimals=0; /* Reserve space for 16 characters for signed numeric data types: hex(-1) -> 'FFFFFFFFFFFFFFFF'. For unsigned numeric types, HEX() can create too large columns. This should be eventually fixed to create minimum possible columns. */ const Type_handler_numeric *tn= dynamic_cast<const Type_handler_numeric*>(m_arg0_type_handler); size_t char_length= (tn && !(tn->flags() & UNSIGNED_FLAG)) ? (size_t) 16 : (size_t) args[0]->max_length * 2; fix_char_length(char_length); return FALSE; } Item *do_get_copy(THD *thd) const override { 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 */ set_maybe_null(); } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("unhex") }; return name; } String *val_str(String *) override; bool fix_length_and_dec() override { collation.set(&my_charset_bin); decimals=0; max_length=(1+args[0]->max_length)/2; return FALSE; } Item *do_get_copy(THD *thd) const override { 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) { set_maybe_null(); } String *val_str(String *) override; bool fix_length_and_dec() override { 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) { } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("like_range_min") }; return name; } Item *do_get_copy(THD *thd) const override { 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) { } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("like_range_max") }; return name; } Item *do_get_copy(THD *thd) const override { 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) override { DBUG_ASSERT(fixed()); 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() override { collation.set(&my_charset_bin); max_length=args[0]->max_length; return FALSE; } void print(String *str, enum_query_type query_type) override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("cast_as_binary") }; return name; } bool need_parentheses_in_default() override { return true; } Item *do_get_copy(THD *thd) const override { 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 *) override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("load_file") }; return name; } bool fix_length_and_dec() override { collation.set(&my_charset_bin, DERIVATION_COERCIBLE); set_maybe_null(); max_length=MAX_BLOB_WIDTH; return FALSE; } bool check_vcol_func_processor(void *arg) override { return mark_unsupported_function(func_name(), "()", arg, VCOL_IMPOSSIBLE); } Item *do_get_copy(THD *thd) const override { 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) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("export_set") }; return name; } Item *do_get_copy(THD *thd) const override { 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) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("quote") }; return name; } String *val_str(String *) override; bool fix_length_and_dec() override { collation.set(args[0]->collation); ulonglong max_result_length= (ulonglong) args[0]->max_length * 2 + 2 * collation.collation->mbmaxlen; // NULL argument is returned as a string "NULL" without quotes if (args[0]->maybe_null()) set_if_bigger(max_result_length, 4 * collation.collation->mbmaxlen); max_length= (uint32) MY_MIN(max_result_length, MAX_BLOB_WIDTH); return FALSE; } Item *do_get_copy(THD *thd) const override { 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]->can_eval_in_optimize()) { 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)))); } } String *val_str(String *) override; longlong val_int() override { 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() override { 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) override { 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) override { 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() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("convert") }; return name; } void print(String *str, enum_query_type query_type) override; Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_conv_charset>(thd, this); } int save_in_field(Field*, bool) override; }; 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 *) override; bool fix_length_and_dec() override; bool eq(const Item *item, bool binary_cmp) const override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("collate") }; return name; } enum precedence precedence() const override { return COLLATE_PRECEDENCE; } enum Functype functype() const override { return COLLATE_FUNC; } void print(String *str, enum_query_type query_type) override; Item_field *field_for_view_update() override { /* this function is transparent for view updating */ return args[0]->field_for_view_update(); } bool need_parentheses_in_default() override { return true; } Item *do_get_copy(THD *thd) const override { 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() override { collation.set(system_charset_info); max_length= 64 * collation.collation->mbmaxlen; // should be enough base_flags&= ~item_base_t::MAYBE_NULL; return FALSE; }; table_map not_null_tables() const override { return 0; } Item* propagate_equal_fields(THD *thd, const Context &ctx, COND_EQUAL *cond) override { return this; } bool const_item() const override { return true; } }; class Item_func_charset :public Item_func_expr_str_metadata { LEX_CSTRING m_cached_charset_info; public: Item_func_charset(THD *thd, Item *a) :Item_func_expr_str_metadata(thd, a) { } String *val_str(String *) override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("charset") }; return name; } Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_charset>(thd, this); } table_map used_tables() const override { return 0; } bool fix_length_and_dec() override { if (Item_func_expr_str_metadata::fix_length_and_dec()) return true; /* Since this is a const item which doesn't use tables (see used_tables()), we don't want to access the function arguments during execution. That's why we store the charset here during the preparation phase and only return it later at the execution phase */ DBUG_ASSERT(args[0]->fixed()); m_cached_charset_info.str= args[0]->charset_for_protocol()->cs_name.str; m_cached_charset_info.length= args[0]->charset_for_protocol()->cs_name.length; return false; } }; 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 *) override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("collation") }; return name; } Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_collation>(thd, this); } }; class Item_func_weight_string :public Item_str_func { String tmp_value; uint weigth_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; weigth_flags= flags_arg; result_length= result_length_arg; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("weight_string") }; return name; } String *val_str(String *) override; bool fix_length_and_dec() override; bool eq(const Item *item, bool binary_cmp) const override { if (!Item_str_func::eq(item, binary_cmp)) return false; Item_func_weight_string *that= (Item_func_weight_string *)item; return this->weigth_flags == that->weigth_flags && this->nweights == that->nweights && this->result_length == that->result_length; } Item* propagate_equal_fields(THD *thd, const Context &ctx, COND_EQUAL *cond) override { return this; } void print(String *str, enum_query_type query_type) override; Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_weight_string>(thd, this); } }; class Item_func_crc32 :public Item_long_func { bool check_arguments() const override { return args[0]->check_type_can_return_str(func_name_cstring()); } String value; public: Item_func_crc32(THD *thd, Item *a): Item_long_func(thd, a) { unsigned_flag= 1; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("crc32") }; return name; } bool fix_length_and_dec() override { max_length=10; return FALSE; } longlong val_int() override; Item *do_get_copy(THD *thd) const override { 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) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("uncompressed_length") }; return name; } bool fix_length_and_dec() override { max_length=10; set_maybe_null(); return FALSE; } longlong val_int() override; Item *do_get_copy(THD *thd) const override { 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() override { max_length= (args[0]->max_length * 120) / 100 + 12; return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("compress") }; return name; } String *val_str(String *) override ZLIB_DEPENDED_FUNCTION Item *do_get_copy(THD *thd) const override { 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() override { set_maybe_null(); max_length= MAX_BLOB_WIDTH; return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("uncompress") }; return name; } String *val_str(String *) override ZLIB_DEPENDED_FUNCTION Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_uncompress>(thd, this); } }; class Item_func_uuid: public Item_str_func { /* Set if uuid should be returned without separators (Oracle sys_guid) */ bool without_separators; public: Item_func_uuid(THD *thd, bool without_separators_arg): Item_str_func(thd), without_separators(without_separators_arg) {} bool fix_length_and_dec() override { collation.set(DTCollation_numeric()); fix_char_length(without_separators ? MY_UUID_ORACLE_STRING_LENGTH : MY_UUID_STRING_LENGTH); return FALSE; } bool const_item() const override { return false; } table_map used_tables() const override { return RAND_TABLE_BIT; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING mariadb_name= {STRING_WITH_LEN("uuid") }; static LEX_CSTRING oracle_name= {STRING_WITH_LEN("sys_guid") }; return without_separators ? oracle_name : mariadb_name; } String *val_str(String *) override; bool check_vcol_func_processor(void *arg) override { return mark_unsupported_function(func_name(), "()", arg, VCOL_NON_DETERMINISTIC); } Item *do_get_copy(THD *thd) const override { 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) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("column_create") }; return name; } String *val_str(String *) override; void print(String *str, enum_query_type query_type) override; enum Functype functype() const override { return DYNCOL_FUNC; } Item *do_get_copy(THD *thd) const override { 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) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("column_add") }; return name; } String *val_str(String *) override; void print(String *str, enum_query_type query_type) override; Item *do_get_copy(THD *thd) const override { 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);} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("column_json") }; return name; } String *val_str(String *) override; bool fix_length_and_dec() override { max_length= MAX_BLOB_WIDTH; set_maybe_null(); decimals= 0; return FALSE; } Item *do_get_copy(THD *thd) const override { 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() override { set_maybe_null(); max_length= MAX_BLOB_WIDTH; return FALSE; } /* Mark that collation can change between calls */ bool dynamic_result() override { return 1; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("column_get") }; return name; } String *val_str(String *) override; longlong val_int() override; longlong val_int_signed_typecast() override { 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() override { 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() override; my_decimal *val_decimal(my_decimal *) override; bool get_dyn_value(THD *thd, DYNAMIC_COLUMN_VALUE *val, String *tmp); bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) override; void print(String *str, enum_query_type query_type) override; Item *do_get_copy(THD *thd) const override { 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() override { set_maybe_null(); max_length= MAX_BLOB_WIDTH; return FALSE; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("column_list") }; return name; } String *val_str(String *) override; Item *do_get_copy(THD *thd) const override { 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 override { 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) override; enum Functype functype() const override { return TEMPTABLE_ROWID; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("<rowid>") }; return name; } bool fix_length_and_dec() override; Item *do_get_copy(THD *thd) const override { 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) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("wsrep_last_written_gtid") }; return name; } String *val_str_ascii(String *) override; bool fix_length_and_dec() override { max_length= WSREP_GTID_STR_LEN; set_maybe_null(); return FALSE; } Item *do_get_copy(THD *thd) const override { 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) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("wsrep_last_seen_gtid") }; return name; } String *val_str_ascii(String *) override; bool fix_length_and_dec() override { max_length= WSREP_GTID_STR_LEN; set_maybe_null(); return FALSE; } Item *do_get_copy(THD *thd) const override { 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 override { return &type_handler_string; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("wsrep_sync_wait_upto_gtid") }; return name; } longlong val_int() override; Item *do_get_copy(THD *thd) const override { return get_item_copy<Item_func_wsrep_sync_wait_upto>(thd, this); } }; #endif /* WITH_WSREP */ #endif /* ITEM_STRFUNC_INCLUDED */
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