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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 18:07:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 18:07:14 +0000 |
commit | a175314c3e5827eb193872241446f2f8f5c9d33c (patch) | |
tree | cd3d60ca99ae00829c52a6ca79150a5b6e62528b /sql/item_create.h | |
parent | Initial commit. (diff) | |
download | mariadb-10.5-a175314c3e5827eb193872241446f2f8f5c9d33c.tar.xz mariadb-10.5-a175314c3e5827eb193872241446f2f8f5c9d33c.zip |
Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | sql/item_create.h | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/sql/item_create.h b/sql/item_create.h new file mode 100644 index 00000000..c04adad4 --- /dev/null +++ b/sql/item_create.h @@ -0,0 +1,345 @@ +/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. + Copyright (c) 2008-2011 Monty Program Ab + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ + +/* Functions to create an item. Used by sql/sql_yacc.yy */ + +#ifndef ITEM_CREATE_H +#define ITEM_CREATE_H + +#include "item_func.h" // Cast_target + +typedef struct st_udf_func udf_func; + +/** + Public function builder interface. + The parser (sql/sql_yacc.yy) uses a factory / builder pattern to + construct an <code>Item</code> object for each function call. + All the concrete function builders implements this interface, + either directly or indirectly with some adapter helpers. + Keeping the function creation separated from the bison grammar allows + to simplify the parser, and avoid the need to introduce a new token + for each function, which has undesirable side effects in the grammar. +*/ + +class Create_func +{ +public: + /** + The builder create method. + Given the function name and list or arguments, this method creates + an <code>Item</code> that represents the function call. + In case or errors, a NULL item is returned, and an error is reported. + Note that the <code>thd</code> object may be modified by the builder. + In particular, the following members/methods can be set/called, + depending on the function called and the function possible side effects. + <ul> + <li><code>thd->lex->binlog_row_based_if_mixed</code></li> + <li><code>thd->lex->current_context()</code></li> + <li><code>thd->lex->safe_to_cache_query</code></li> + <li><code>thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT)</code></li> + <li><code>thd->lex->uncacheable(UNCACHEABLE_RAND)</code></li> + <li><code>thd->lex->add_time_zone_tables_to_query_tables(thd)</code></li> + </ul> + @param thd The current thread + @param name The function name + @param item_list The list of arguments to the function, can be NULL + @return An item representing the parsed function call, or NULL + */ + virtual Item *create_func(THD *thd, LEX_CSTRING *name, List<Item> *item_list) = 0; + +protected: + /** Constructor */ + Create_func() {} + /** Destructor */ + virtual ~Create_func() {} +}; + + +/** + Adapter for functions that takes exactly zero arguments. +*/ + +class Create_func_arg0 : public Create_func +{ +public: + virtual Item *create_func(THD *thd, LEX_CSTRING *name, + List<Item> *item_list); + + /** + Builder method, with no arguments. + @param thd The current thread + @return An item representing the function call + */ + virtual Item *create_builder(THD *thd) = 0; + +protected: + /** Constructor. */ + Create_func_arg0() {} + /** Destructor. */ + virtual ~Create_func_arg0() {} +}; + + +/** + Adapter for functions that takes exactly one argument. +*/ + +class Create_func_arg1 : public Create_func +{ +public: + virtual Item *create_func(THD *thd, LEX_CSTRING *name, List<Item> *item_list); + + /** + Builder method, with one argument. + @param thd The current thread + @param arg1 The first argument of the function + @return An item representing the function call + */ + virtual Item *create_1_arg(THD *thd, Item *arg1) = 0; + +protected: + /** Constructor. */ + Create_func_arg1() {} + /** Destructor. */ + virtual ~Create_func_arg1() {} +}; + + +/** + Adapter for functions that takes exactly two arguments. +*/ + +class Create_func_arg2 : public Create_func +{ +public: + virtual Item *create_func(THD *thd, LEX_CSTRING *name, List<Item> *item_list); + + /** + Builder method, with two arguments. + @param thd The current thread + @param arg1 The first argument of the function + @param arg2 The second argument of the function + @return An item representing the function call + */ + virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2) = 0; + +protected: + /** Constructor. */ + Create_func_arg2() {} + /** Destructor. */ + virtual ~Create_func_arg2() {} +}; + + +/** + Adapter for functions that takes exactly three arguments. +*/ + +class Create_func_arg3 : public Create_func +{ +public: + virtual Item *create_func(THD *thd, LEX_CSTRING *name, List<Item> *item_list); + + /** + Builder method, with three arguments. + @param thd The current thread + @param arg1 The first argument of the function + @param arg2 The second argument of the function + @param arg3 The third argument of the function + @return An item representing the function call + */ + virtual Item *create_3_arg(THD *thd, Item *arg1, Item *arg2, Item *arg3) = 0; + +protected: + /** Constructor. */ + Create_func_arg3() {} + /** Destructor. */ + virtual ~Create_func_arg3() {} +}; + + + + +/** + Adapter for native functions with a variable number of arguments. + The main use of this class is to discard the following calls: + <code>foo(expr1 AS name1, expr2 AS name2, ...)</code> + which are syntactically correct (the syntax can refer to a UDF), + but semantically invalid for native functions. +*/ + +class Create_native_func : public Create_func +{ +public: + virtual Item *create_func(THD *thd, LEX_CSTRING *name, + List<Item> *item_list); + + /** + Builder method, with no arguments. + @param thd The current thread + @param name The native function name + @param item_list The function parameters, none of which are named + @return An item representing the function call + */ + virtual Item *create_native(THD *thd, LEX_CSTRING *name, + List<Item> *item_list) = 0; + +protected: + /** Constructor. */ + Create_native_func() {} + /** Destructor. */ + virtual ~Create_native_func() {} +}; + + +/** + Function builder for qualified functions. + This builder is used with functions call using a qualified function name + syntax, as in <code>db.func(expr, expr, ...)</code>. +*/ + +class Create_qfunc : public Create_func +{ +public: + /** + The builder create method, for unqualified functions. + This builder will use the current database for the database name. + @param thd The current thread + @param name The function name + @param item_list The list of arguments to the function, can be NULL + @return An item representing the parsed function call + */ + virtual Item *create_func(THD *thd, LEX_CSTRING *name, + List<Item> *item_list); + + /** + The builder create method, for qualified functions. + @param thd The current thread + @param db The database name + @param name The function name + @param use_explicit_name Should the function be represented as 'db.name'? + @param item_list The list of arguments to the function, can be NULL + @return An item representing the parsed function call + */ + virtual Item *create_with_db(THD *thd, LEX_CSTRING *db, LEX_CSTRING *name, + bool use_explicit_name, + List<Item> *item_list) = 0; + +protected: + /** Constructor. */ + Create_qfunc() {} + /** Destructor. */ + virtual ~Create_qfunc() {} +}; + + +/** + Find the native function builder associated with a given function name. + @param thd The current thread + @param name The native function name + @return The native function builder associated with the name, or NULL +*/ +extern Create_func *find_native_function_builder(THD *thd, + const LEX_CSTRING *name); + + +/** + Find the function builder for qualified functions. + @param thd The current thread + @return A function builder for qualified functions +*/ +extern Create_qfunc * find_qualified_function_builder(THD *thd); + + +#ifdef HAVE_DLOPEN +/** + Function builder for User Defined Functions. +*/ + +class Create_udf_func : public Create_func +{ +public: + virtual Item *create_func(THD *thd, LEX_CSTRING *name, + List<Item> *item_list); + + /** + The builder create method, for User Defined Functions. + @param thd The current thread + @param fct The User Defined Function metadata + @param item_list The list of arguments to the function, can be NULL + @return An item representing the parsed function call + */ + Item *create(THD *thd, udf_func *fct, List<Item> *item_list); + + /** Singleton. */ + static Create_udf_func s_singleton; + +protected: + /** Constructor. */ + Create_udf_func() {} + /** Destructor. */ + virtual ~Create_udf_func() {} +}; +#endif + + +struct Native_func_registry +{ + LEX_CSTRING name; + Create_func *builder; +}; + +int item_create_init(); +int item_create_append(Native_func_registry array[]); +int item_create_remove(Native_func_registry array[]); +void item_create_cleanup(); + +Item *create_func_dyncol_create(THD *thd, List<DYNCALL_CREATE_DEF> &list); +Item *create_func_dyncol_add(THD *thd, Item *str, + List<DYNCALL_CREATE_DEF> &list); +Item *create_func_dyncol_delete(THD *thd, Item *str, List<Item> &nums); +Item *create_func_dyncol_get(THD *thd, Item *num, Item *str, + const Type_handler *handler, + const char *c_len, const char *c_dec, + CHARSET_INFO *cs); +Item *create_func_dyncol_json(THD *thd, Item *str); + + +class Native_func_registry_array +{ + const Native_func_registry *m_elements; + size_t m_count; +public: + Native_func_registry_array() + :m_elements(NULL), + m_count(0) + { } + Native_func_registry_array(const Native_func_registry *elements, size_t count) + :m_elements(elements), + m_count(count) + { } + const Native_func_registry& element(size_t i) const + { + DBUG_ASSERT(i < m_count); + return m_elements[i]; + } + size_t count() const { return m_count; } + bool append_to_hash(HASH *hash) const; +}; + + +#endif + |