#include "univ.i"#include "que0types.h"#include "usr0types.h"#include "pars0sym.h"#include "dict0types.h"#include "row0sel.h"#include "pars0opt.ic"
Include dependency graph for pars0opt.h:
Go to the source code of this file.
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
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
- Parameters
-
copy_val in: if TRUE, new found columns are added as columns to copy index in: index to use col_list in: base node of a list where to add new found columns plan in: plan or NULL
| UNIV_INTERN void opt_print_query_plan | ( | sel_node_t * | sel_node | ) |
Prints info of a query plan. in: select node
| 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
