sql_derived.cc File Reference

#include "sql/sql_derived.h"
#include <stddef.h>
#include <string.h>
#include <sys/types.h>
#include "lex_string.h"
#include "my_alloc.h"
#include "my_base.h"
#include "my_bitmap.h"
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_sys.h"
#include "my_table_map.h"
#include "mysqld_error.h"
#include "sql/auth/auth_acls.h"
#include "sql/debug_sync.h"
#include "sql/handler.h"
#include "sql/item.h"
#include "sql/join_optimizer/join_optimizer.h"
#include "sql/mem_root_array.h"
#include "sql/nested_join.h"
#include "sql/opt_trace.h"
#include "sql/query_options.h"
#include "sql/sql_base.h"
#include "sql/sql_class.h"
#include "sql/sql_const.h"
#include "sql/sql_executor.h"
#include "sql/sql_lex.h"
#include "sql/sql_list.h"
#include "sql/sql_opt_exec_shared.h"
#include "sql/sql_optimizer.h"
#include "sql/sql_parse.h"
#include "sql/sql_resolver.h"
#include "sql/sql_tmp_table.h"
#include "sql/sql_union.h"
#include "sql/sql_view.h"
#include "sql/table.h"
#include "sql/table_function.h"
#include "sql/thd_raii.h"
#include "thr_lock.h"

Functions
static void	swap_column_names_of_unit_and_tmp_table (const mem_root_deque< Item * > &unit_items, const Create_col_name_list &tmp_table_col_names)
	Helper function for Table_ref::setup_materialized_derived() More...
bool	copy_field_info (THD *thd, Item *orig_expr, Item *cloned_expr)
	Copy field information like table_ref, context etc of all the fields from the original expression to the cloned expression. More...
static Item *	parse_expression (THD *thd, Item *item, Query_block *query_block, Table_ref *derived_table)
	Given an item and a query block, this function creates a clone of the item (unresolved) by reparsing the item. More...
Item *	resolve_expression (THD *thd, Item *item, Query_block *query_block)
	Resolves the expression given. More...

Function Documentation

copy_field_info()

bool copy_field_info	(	THD *	thd,
		Item *	orig_expr,
		Item *	cloned_expr
	)

Copy field information like table_ref, context etc of all the fields from the original expression to the cloned expression.

Parameters

thd	current thread
orig_expr	original expression
cloned_expr	cloned expression

Returns

true on error, false otherwise

parse_expression()

static Item * parse_expression ( THD *  thd, Item *  item, Query_block *  query_block, Table_ref *  derived_table  )

static

Given an item and a query block, this function creates a clone of the item (unresolved) by reparsing the item.

Used during condition pushdown to derived tables.

Parameters

thd	Current thread.
item	Item to be reparsed to get a clone.
query_block	query block where expression is being parsed
derived_table	derived table to which the item belongs to. "nullptr" when cloning to make a copy of the original condition to be pushed down to a derived table that has SET operations.

Returns

A copy of the original item (unresolved) on success else nullptr.

resolve_expression()

Item * resolve_expression	(	THD *	thd,
		Item *	item,
		Query_block *	query_block
	)

Resolves the expression given.

Used with parse_expression() to clone an item during condition pushdown. For all the column references in the expression, information like table reference, field, context etc is expected to be correctly set. This will just do a short cut fix_fields() for Item_field.

Parameters

thd	Current thread.
item	Item to resolve.
query_block	query block where this item needs to be resolved.

Returns

resolved item if resolving was successful else nullptr.

swap_column_names_of_unit_and_tmp_table()

static void swap_column_names_of_unit_and_tmp_table ( const mem_root_deque< Item * > &  unit_items, const Create_col_name_list &  tmp_table_col_names  )

static

Helper function for Table_ref::setup_materialized_derived()