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68 lines
2.6 KiB
C
68 lines
2.6 KiB
C
/*****************************************************************************
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Copyright (c) 1997, 2016, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2017, 2018, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/pars0opt.h
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Simple SQL optimizer
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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 "que0types.h"
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#include "pars0sym.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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#ifdef UNIV_SQL_DEBUG
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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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#endif /* UNIV_SQL_DEBUG */
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#endif
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