diff options
Diffstat (limited to 'sql/sql_lex.cc')
| -rw-r--r-- | sql/sql_lex.cc | 189 |
1 files changed, 163 insertions, 26 deletions
diff --git a/sql/sql_lex.cc b/sql/sql_lex.cc index 7f1b362d91d..6b0a351f76e 100644 --- a/sql/sql_lex.cc +++ b/sql/sql_lex.cc @@ -827,7 +827,7 @@ Yacc_state::~Yacc_state() } int Lex_input_stream::find_keyword(Lex_ident_cli_st *kwd, - uint len, bool function) + uint len, bool function) const { const char *tok= m_tok_start; @@ -847,7 +847,6 @@ int Lex_input_stream::find_keyword(Lex_ident_cli_st *kwd, case CLOB_MARIADB_SYM: return CLOB_ORACLE_SYM; case CONTINUE_MARIADB_SYM: return CONTINUE_ORACLE_SYM; case DECLARE_MARIADB_SYM: return DECLARE_ORACLE_SYM; - case DECODE_MARIADB_SYM: return DECODE_ORACLE_SYM; case ELSEIF_MARIADB_SYM: return ELSEIF_ORACLE_SYM; case ELSIF_MARIADB_SYM: return ELSIF_ORACLE_SYM; case EXCEPTION_MARIADB_SYM: return EXCEPTION_ORACLE_SYM; @@ -917,7 +916,7 @@ bool is_lex_native_function(const LEX_CSTRING *name) bool is_native_function(THD *thd, const LEX_CSTRING *name) { - if (find_native_function_builder(thd, name)) + if (mariadb_schema.find_native_function_builder(thd, *name)) return true; if (is_lex_native_function(name)) @@ -1542,7 +1541,18 @@ int Lex_input_stream::lex_one_token(YYSTYPE *yylval, THD *thd) if (lex->parsing_options.lookup_keywords_after_qualifier) next_state= MY_LEX_IDENT_OR_KEYWORD; else - next_state= MY_LEX_IDENT_START; // Next is ident (not keyword) + { + /* + Next is: + - A qualified func with a special syntax: + mariadb_schema.REPLACE('a','b','c') + mariadb_schema.SUSTRING('a',1,2) + mariadb_schema.TRIM('a') + - Or an identifier otherwise. No keyword lookup is done, + all keywords are treated as identifiers. + */ + next_state= MY_LEX_IDENT_OR_QUALIFIED_SPECIAL_FUNC; + } if (!ident_map[(uchar) yyPeek()]) // Probably ` or " next_state= MY_LEX_START; return((int) c); @@ -1986,7 +1996,12 @@ int Lex_input_stream::lex_one_token(YYSTYPE *yylval, THD *thd) We should now be able to handle: [(global | local | session) .]variable_name */ - return scan_ident_sysvar(thd, &yylval->ident_cli); + return scan_ident_common(thd, &yylval->ident_cli, + GENERAL_KEYWORD_OR_FUNC_LPAREN); + + case MY_LEX_IDENT_OR_QUALIFIED_SPECIAL_FUNC: + return scan_ident_common(thd, &yylval->ident_cli, + QUALIFIED_SPECIAL_FUNC_LPAREN); } } } @@ -2008,7 +2023,59 @@ bool Lex_input_stream::get_7bit_or_8bit_ident(THD *thd, uchar *last_char) } -int Lex_input_stream::scan_ident_sysvar(THD *thd, Lex_ident_cli_st *str) +/* + Resolve special SQL functions that have a qualified syntax in sql_yacc.yy. + These functions are not listed in the native function registry + because of a special syntax, or a reserved keyword: + + mariadb_schema.SUBSTRING('a' FROM 1 FOR 2) -- Special syntax + mariadb_schema.TRIM(BOTH ' ' FROM 'a') -- Special syntax + mariadb_schema.REPLACE('a','b','c') -- Verb keyword +*/ + +int Lex_input_stream::find_keyword_qualified_special_func(Lex_ident_cli_st *str, + uint length) const +{ + /* + There are many other special functions, see the following grammar rules: + function_call_keyword + function_call_nonkeyword + Here we resolve only those that have a qualified syntax to handle + different behavior in different @@sql_mode settings. + + Other special functions do not work in qualified context: + SELECT mariadb_schema.year(now()); -- Function year is not defined + SELECT mariadb_schema.now(); -- Function now is not defined + + We don't resolve TRIM_ORACLE here, because it does not have + a qualified syntax yet. Search for "trim_operands" in sql_yacc.yy + to find more comments. + */ + static LEX_CSTRING funcs[]= + { + {STRING_WITH_LEN("SUBSTRING")}, + {STRING_WITH_LEN("SUBSTR")}, + {STRING_WITH_LEN("TRIM")}, + {STRING_WITH_LEN("REPLACE")} + }; + + int tokval= find_keyword(str, length, true); + if (!tokval) + return 0; + for (size_t i= 0; i < array_elements(funcs); i++) + { + CHARSET_INFO *cs= system_charset_info; + if (!cs->coll->strnncollsp(cs, + (const uchar *) m_tok_start, length, + (const uchar *) funcs[i].str, funcs[i].length)) + return tokval; + } + return 0; +} + + +int Lex_input_stream::scan_ident_common(THD *thd, Lex_ident_cli_st *str, + Ident_mode mode) { uchar last_char; uint length; @@ -2022,10 +2089,41 @@ int Lex_input_stream::scan_ident_sysvar(THD *thd, Lex_ident_cli_st *str) next_state= MY_LEX_IDENT_SEP; if (!(length= yyLength())) return ABORT_SYM; // Names must be nonempty. - if ((tokval= find_keyword(str, length, 0))) - { - yyUnget(); // Put back 'c' - return tokval; // Was keyword + + switch (mode) { + case GENERAL_KEYWORD_OR_FUNC_LPAREN: + /* + We can come here inside a system variable after "@@", + e.g. @@global.character_set_client. + We resolve all general purpose keywords here. + + We can come here when LEX::parsing_options.lookup_keywords_after_qualifier + is true, i.e. within the "field_spec" Bison rule. + We need to resolve functions that have special rules inside sql_yacc.yy, + such as SUBSTR, REPLACE, TRIM, to make this work: + c2 varchar(4) GENERATED ALWAYS AS (mariadb_schema.substr(c1,1,4)) + */ + if ((tokval= find_keyword(str, length, last_char == '('))) + { + yyUnget(); // Put back 'c' + return tokval; // Was keyword + } + break; + case QUALIFIED_SPECIAL_FUNC_LPAREN: + /* + We come here after '.' in various contexts: + SELECT @@global.character_set_client; + SELECT t1.a FROM t1; + SELECT test.f1() FROM t1; + SELECT mariadb_schema.trim('a'); + */ + if (last_char == '(' && + (tokval= find_keyword_qualified_special_func(str, length))) + { + yyUnget(); // Put back 'c' + return tokval; // Was keyword + } + break; } yyUnget(); // ptr points now after last token char @@ -2075,9 +2173,9 @@ int Lex_input_stream::scan_ident_start(THD *thd, Lex_ident_cli_st *str) { is_8bit= get_7bit_or_8bit_ident(thd, &c); } + if (c == '.' && ident_map[(uchar) yyPeek()]) next_state= MY_LEX_IDENT_SEP;// Next is '.' - uint length= yyLength(); yyUnget(); // ptr points now after last token char str->set_ident(m_tok_start, length, is_8bit); @@ -8035,30 +8133,49 @@ bool LEX::add_grant_command(THD *thd, enum_sql_command sql_command_arg, } -Item *LEX::make_item_func_substr(THD *thd, Item *a, Item *b, Item *c) +const Schema * +LEX::find_func_schema_by_name_or_error(const Lex_ident_sys &schema, + const Lex_ident_sys &func) { - return (thd->variables.sql_mode & MODE_ORACLE) ? - new (thd->mem_root) Item_func_substr_oracle(thd, a, b, c) : - new (thd->mem_root) Item_func_substr(thd, a, b, c); + Schema *res= Schema::find_by_name(schema); + if (res) + return res; + Database_qualified_name qname(schema, func); + my_error(ER_FUNCTION_NOT_DEFINED, MYF(0), ErrConvDQName(&qname).ptr()); + return NULL; } -Item *LEX::make_item_func_substr(THD *thd, Item *a, Item *b) +Item *LEX::make_item_func_substr(THD *thd, + const Lex_ident_cli_st &schema_name_cli, + const Lex_ident_cli_st &func_name_cli, + const Lex_substring_spec_st &spec) { - return (thd->variables.sql_mode & MODE_ORACLE) ? - new (thd->mem_root) Item_func_substr_oracle(thd, a, b) : - new (thd->mem_root) Item_func_substr(thd, a, b); + Lex_ident_sys schema_name(thd, &schema_name_cli); + Lex_ident_sys func_name(thd, &func_name_cli); + if (schema_name.is_null() || func_name.is_null()) + return NULL; // EOM + const Schema *schema= find_func_schema_by_name_or_error(schema_name, + func_name); + return schema ? schema->make_item_func_substr(thd, spec) : NULL; } Item *LEX::make_item_func_replace(THD *thd, + const Lex_ident_cli_st &schema_name_cli, + const Lex_ident_cli_st &func_name_cli, Item *org, Item *find, Item *replace) { - return (thd->variables.sql_mode & MODE_ORACLE) ? - new (thd->mem_root) Item_func_replace_oracle(thd, org, find, replace) : - new (thd->mem_root) Item_func_replace(thd, org, find, replace); + Lex_ident_sys schema_name(thd, &schema_name_cli); + Lex_ident_sys func_name(thd, &func_name_cli); + if (schema_name.is_null() || func_name.is_null()) + return NULL; // EOM + const Schema *schema= find_func_schema_by_name_or_error(schema_name, + func_name); + return schema ? schema->make_item_func_replace(thd, org, find, replace) : + NULL; } @@ -8140,11 +8257,18 @@ Item *Lex_trim_st::make_item_func_trim_oracle(THD *thd) const } -Item *Lex_trim_st::make_item_func_trim(THD *thd) const +Item *Lex_trim_st::make_item_func_trim(THD *thd, + const Lex_ident_cli_st &schema_name_cli, + const Lex_ident_cli_st &func_name_cli) + const { - return (thd->variables.sql_mode & MODE_ORACLE) ? - make_item_func_trim_oracle(thd) : - make_item_func_trim_std(thd); + Lex_ident_sys schema_name(thd, &schema_name_cli); + Lex_ident_sys func_name(thd, &func_name_cli); + if (schema_name.is_null() || func_name.is_null()) + return NULL; // EOM + const Schema *schema= LEX::find_func_schema_by_name_or_error(schema_name, + func_name); + return schema ? schema->make_item_func_trim(thd, *this) : NULL; } @@ -8176,6 +8300,19 @@ Item *LEX::make_item_func_call_generic(THD *thd, Lex_ident_cli_st *cdb, if (check_routine_name(&name)) return NULL; + return make_item_func_call_generic(thd, db, name, args); +} + + +Item *LEX::make_item_func_call_generic(THD *thd, + const Lex_ident_sys &db, + const Lex_ident_sys &name, + List<Item> *args) +{ + const Schema *schema= Schema::find_by_name(db); + if (schema) + return schema->make_item_func_call_native(thd, name, args); + Create_qfunc *builder= find_qualified_function_builder(thd); DBUG_ASSERT(builder); return builder->create_with_db(thd, &db, &name, true, args); |