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59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
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/******************************************************
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Simple SQL optimizer
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(c) 1997 Innobase Oy
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Created 12/21/1997 Heikki Tuuri
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*******************************************************/
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#ifndef pars0opt_h
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#define pars0opt_h
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#include "univ.i"
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#include "que0types.h"
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#include "usr0types.h"
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#include "pars0sym.h"
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#include "dict0types.h"
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#include "row0sel.h"
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/***********************************************************************
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Optimizes a select. Decides which indexes to tables to use. The tables
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are accessed in the order that they were written to the FROM part in the
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select statement. */
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void
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opt_search_plan(
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/*============*/
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sel_node_t* sel_node); /* in: parsed select node */
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/***********************************************************************
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Looks for occurrences of the columns of the table in the query subgraph and
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adds them to the list of columns if an occurrence of the same column does not
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already exist in the list. If the column is already in the list, puts a value
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indirection to point to the occurrence in the column list, except if the
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column occurrence we are looking at is in the column list, in which case
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nothing is done. */
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void
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opt_find_all_cols(
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/*==============*/
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ibool copy_val, /* in: if TRUE, new found columns are
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added as columns to copy */
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dict_index_t* index, /* in: index to use */
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sym_node_list_t* col_list, /* in: base node of a list where
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to add new found columns */
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plan_t* plan, /* in: plan or NULL */
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que_node_t* exp); /* in: expression or condition */
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/************************************************************************
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Prints info of a query plan. */
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void
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opt_print_query_plan(
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/*=================*/
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sel_node_t* sel_node); /* in: select node */
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#ifndef UNIV_NONINL
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#include "pars0opt.ic"
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#endif
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#endif
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