pars0opt.h File Reference

#include "univ.i"
#include "que0types.h"
#include "usr0types.h"
#include "pars0sym.h"
#include "dict0types.h"
#include "row0sel.h"
#include "pars0opt.ic"

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Functions
UNIV_INTERN void	opt_search_plan (sel_node_t *sel_node)
UNIV_INTERN void	opt_find_all_cols (ibool copy_val, dict_index_t *index, sym_node_list_t *col_list, plan_t *plan, que_node_t *exp)
UNIV_INTERN void	opt_print_query_plan (sel_node_t *sel_node)

Detailed Description

Simple SQL optimizer

Created 12/21/1997 Heikki Tuuri

Definition in file pars0opt.h.

Function Documentation

UNIV_INTERN void opt_find_all_cols	(	ibool	copy_val,
		dict_index_t *	index,
		sym_node_list_t *	col_list,
		plan_t *	plan,
		que_node_t *	exp
	)

Looks for occurrences of the columns of the table in the query subgraph and adds them to the list of columns if an occurrence of the same column does not already exist in the list. If the column is already in the list, puts a value indirection to point to the occurrence in the column list, except if the column occurrence we are looking at is in the column list, in which case nothing is done. in: expression or condition

Looks for occurrences of the columns of the table in the query subgraph and adds them to the list of columns if an occurrence of the same column does not already exist in the list. If the column is already in the list, puts a value indirection to point to the occurrence in the column list, except if the column occurrence we are looking at is in the column list, in which case nothing is done.

Parameters

copy_val	in: if TRUE, new found columns are added as columns to copy
index	in: index of the table to use
col_list	in: base node of a list where to add new found columns
plan	in: plan or NULL
exp	in: expression or condition or NULL

Definition at line 867 of file pars0opt.cc.

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UNIV_INTERN void opt_print_query_plan

(

sel_node_t *

sel_node

)

Prints info of a query plan. in: select node

Prints info of a query plan.

Parameters

sel_node

in: select node

Definition at line 1218 of file pars0opt.cc.

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UNIV_INTERN void opt_search_plan

(

sel_node_t *

sel_node

)

Optimizes a select. Decides which indexes to tables to use. The tables are accessed in the order that they were written to the FROM part in the select statement. in: parsed select node

Optimizes a select. Decides which indexes to tables to use. The tables are accessed in the order that they were written to the FROM part in the select statement.

Parameters

sel_node

in: parsed select node

Definition at line 1141 of file pars0opt.cc.

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