65 lines
2.7 KiB
C
65 lines
2.7 KiB
C
/*****************************************************************************
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Copyright (c) 1997, 2018, Oracle and/or its affiliates. All Rights Reserved.
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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, version 2.0, as published by the
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Free Software Foundation.
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This program is also distributed with certain software (including but not
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limited to OpenSSL) that is licensed under separate terms, as designated in a
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particular file or component or in included license documentation. The authors
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of MySQL hereby grant you an additional permission to link the program and
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your derivative works with the separately licensed software that they have
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included with MySQL.
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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, version 2.0,
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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 St, Fifth Floor, Boston, MA 02110-1301 USA
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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 "dict0types.h"
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#include "pars0sym.h"
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#include "que0types.h"
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#include "row0sel.h"
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#include "univ.i"
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#include "usr0types.h"
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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 opt_search_plan(sel_node_t *sel_node); /*!< in: parsed select node */
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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 opt_find_all_cols(
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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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#include "pars0opt.ic"
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#endif
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