1996-08-28 03:59:28 +02:00
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/*-------------------------------------------------------------------------
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*
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1999-02-14 00:22:53 +01:00
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* relation.h
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1997-09-07 07:04:48 +02:00
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* Definitions for internal planner nodes.
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1996-08-28 03:59:28 +02:00
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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2000-01-09 01:26:47 +01:00
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* $Id: relation.h,v 1.40 2000/01/09 00:26:44 tgl Exp $
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1996-08-28 03:59:28 +02:00
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef RELATION_H
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#define RELATION_H
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1999-07-16 01:04:24 +02:00
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#include "nodes/parsenodes.h"
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1996-08-28 03:59:28 +02:00
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/*
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1999-02-18 01:49:48 +01:00
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* Relids
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1997-09-07 07:04:48 +02:00
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* List of relation identifiers (indexes into the rangetable).
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1999-08-16 04:17:58 +02:00
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*
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* Note: these are lists of integers, not Nodes.
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1996-08-28 03:59:28 +02:00
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*/
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1999-02-18 01:49:48 +01:00
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typedef List *Relids;
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1996-08-28 03:59:28 +02:00
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/*
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1998-07-18 06:22:52 +02:00
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* RelOptInfo
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1999-08-16 04:17:58 +02:00
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* Per-relation information for planning/optimization
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1996-08-28 03:59:28 +02:00
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*
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1997-09-07 07:04:48 +02:00
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* Parts of this data structure are specific to various scan and join
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* mechanisms. It didn't seem worth creating new node types for them.
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1996-08-28 03:59:28 +02:00
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*
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1999-08-16 04:17:58 +02:00
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* relids - List of base-relation identifiers; it is a base relation
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* if there is just one, a join relation if more than one
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2000-01-09 01:26:47 +01:00
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* rows - estimated number of tuples in the relation after restriction
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* clauses have been applied (ie, output rows of a plan for it)
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1999-08-16 04:17:58 +02:00
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* width - avg. number of bytes per tuple in the relation after the
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2000-01-09 01:26:47 +01:00
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* appropriate projections have been done (ie, output width)
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1997-09-07 07:04:48 +02:00
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* targetlist - List of TargetList nodes
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1999-08-16 04:17:58 +02:00
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* pathlist - List of Path nodes, one for each potentially useful
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* method of generating the relation
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* cheapestpath - least expensive Path (regardless of ordering)
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* pruneable - flag to let the planner know whether it can prune the
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* pathlist of this RelOptInfo or not.
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1996-08-28 03:59:28 +02:00
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*
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2000-01-09 01:26:47 +01:00
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* * If the relation is a base relation it will have these fields set:
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1999-08-16 04:17:58 +02:00
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*
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2000-01-09 01:26:47 +01:00
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* indexed - true if the relation has secondary indices
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* pages - number of disk pages in relation
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* tuples - number of tuples in relation (not considering restrictions)
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1999-08-16 04:17:58 +02:00
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*
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1997-09-07 07:04:48 +02:00
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* * The presence of the remaining fields depends on the restrictions
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1999-08-16 04:17:58 +02:00
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* and joins that the relation participates in:
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1996-08-28 03:59:28 +02:00
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*
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1999-02-03 21:15:53 +01:00
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* restrictinfo - List of RestrictInfo nodes, containing info about each
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1997-09-07 07:04:48 +02:00
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* qualification clause in which this relation participates
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* joininfo - List of JoinInfo nodes, containing info about each join
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* clause in which this relation participates
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* innerjoin - List of Path nodes that represent indices that may be used
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1999-08-16 04:17:58 +02:00
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* as inner paths of nestloop joins. This field is non-null
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* only for base rels, since join rels have no indices.
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1996-08-28 03:59:28 +02:00
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*/
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1998-07-18 06:22:52 +02:00
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typedef struct RelOptInfo
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1997-09-07 07:04:48 +02:00
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{
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1997-09-08 04:41:22 +02:00
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NodeTag type;
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1997-09-07 07:04:48 +02:00
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1999-08-16 04:17:58 +02:00
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/* all relations included in this RelOptInfo */
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2000-01-09 01:26:47 +01:00
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Relids relids; /* integer list of base relids (RT indexes) */
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1999-08-16 04:17:58 +02:00
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2000-01-09 01:26:47 +01:00
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/* size estimates generated by planner */
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double rows; /* estimated number of result tuples */
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int width; /* estimated avg width of result tuples */
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1997-09-07 07:04:48 +02:00
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/* materialization information */
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1997-09-08 04:41:22 +02:00
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List *targetlist;
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1999-02-04 02:47:02 +01:00
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List *pathlist; /* Path structures */
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1999-05-25 18:15:34 +02:00
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struct Path *cheapestpath;
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1997-09-08 04:41:22 +02:00
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bool pruneable;
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1997-09-07 07:04:48 +02:00
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2000-01-09 01:26:47 +01:00
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/* statistics from pg_class (only valid if it's a base rel!) */
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bool indexed;
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long pages;
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double tuples;
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1997-09-07 07:04:48 +02:00
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/* used by various scans and joins: */
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1999-02-04 02:47:02 +01:00
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List *restrictinfo; /* RestrictInfo structures */
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List *joininfo; /* JoinInfo structures */
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1999-08-16 04:17:58 +02:00
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List *innerjoin; /* potential indexscans for nestloop joins */
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/* innerjoin indexscans are not in the main pathlist because they are
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* not usable except in specific join contexts; we have to test before
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* seeing whether they can be used.
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*/
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1999-05-26 00:43:53 +02:00
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} RelOptInfo;
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1997-09-07 07:04:48 +02:00
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2000-01-09 01:26:47 +01:00
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/*
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* IndexOptInfo
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* Per-index information for planning/optimization
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*
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* Prior to Postgres 7.0, RelOptInfo was used to describe both relations
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* and indexes, but that created confusion without actually doing anything
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* useful. So now we have a separate IndexOptInfo struct for indexes.
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*
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* indexoid - OID of the index relation itself
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* pages - number of disk pages in index
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* tuples - number of index tuples in index
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* classlist - List of PG_AMOPCLASS OIDs for the index
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* indexkeys - List of base-relation attribute numbers that are index keys
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* ordering - List of PG_OPERATOR OIDs which order the indexscan result
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* relam - the OID of the pg_am of the index
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* indproc - OID of the function if a functional index, else 0
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* indpred - index predicate if a partial index, else NULL
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*
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* NB. the last element of the arrays classlist, indexkeys and ordering
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* is always 0.
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*/
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typedef struct IndexOptInfo
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{
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NodeTag type;
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Oid indexoid; /* OID of the index relation */
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/* statistics from pg_class */
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long pages;
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double tuples;
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/* index descriptor information */
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Oid *classlist; /* classes of AM operators */
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int *indexkeys; /* keys over which we're indexing */
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Oid *ordering; /* OIDs of sort operators for each key */
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Oid relam; /* OID of the access method (in pg_am) */
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Oid indproc; /* if a functional index */
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List *indpred; /* if a partial index */
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} IndexOptInfo;
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1999-08-16 04:17:58 +02:00
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/*
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* PathKeys
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*
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* The sort ordering of a path is represented by a list of sublists of
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* PathKeyItem nodes. An empty list implies no known ordering. Otherwise
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* the first sublist represents the primary sort key, the second the
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* first secondary sort key, etc. Each sublist contains one or more
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* PathKeyItem nodes, each of which can be taken as the attribute that
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* appears at that sort position. (See the top of optimizer/path/pathkeys.c
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* for more information.)
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*/
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1997-09-07 07:04:48 +02:00
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1999-08-16 04:17:58 +02:00
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typedef struct PathKeyItem
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1997-09-07 07:04:48 +02:00
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{
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1997-09-08 04:41:22 +02:00
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NodeTag type;
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1997-09-07 07:04:48 +02:00
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1999-08-16 04:17:58 +02:00
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Node *key; /* the item that is ordered */
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Oid sortop; /* the ordering operator ('<' op) */
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/*
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* key typically points to a Var node, ie a relation attribute,
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* but it can also point to a Func clause representing the value
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* indexed by a functional index. Someday we might allow arbitrary
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* expressions as path keys, so don't assume more than you must.
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*/
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} PathKeyItem;
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1999-02-09 04:51:42 +01:00
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1999-08-16 04:17:58 +02:00
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/*
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* Type "Path" is used as-is for sequential-scan paths. For other
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* path types it is the first component of a larger struct.
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*/
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1997-09-07 07:04:48 +02:00
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typedef struct Path
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{
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1997-09-08 04:41:22 +02:00
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NodeTag type;
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1997-09-07 07:04:48 +02:00
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1999-08-16 04:17:58 +02:00
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RelOptInfo *parent; /* the relation this path can build */
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1997-09-07 07:04:48 +02:00
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1999-08-16 04:17:58 +02:00
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Cost path_cost; /* estimated execution cost of path */
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1997-09-07 07:04:48 +02:00
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1999-08-16 04:17:58 +02:00
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NodeTag pathtype; /* tag identifying scan/join method */
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/* XXX why is pathtype separate from the NodeTag? */
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1997-09-07 07:04:48 +02:00
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1999-08-16 04:17:58 +02:00
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List *pathkeys; /* sort ordering of path's output */
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/* pathkeys is a List of Lists of PathKeyItem nodes; see above */
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1997-09-08 23:56:23 +02:00
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} Path;
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1997-09-07 07:04:48 +02:00
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1999-07-25 01:21:14 +02:00
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/*----------
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* IndexPath represents an index scan. Although an indexscan can only read
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* a single relation, it can scan it more than once, potentially using a
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* different index during each scan. The result is the union (OR) of all the
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* tuples matched during any scan. (The executor is smart enough not to return
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* the same tuple more than once, even if it is matched in multiple scans.)
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1999-08-16 04:17:58 +02:00
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*
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1999-07-25 01:21:14 +02:00
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* 'indexid' is a list of index relation OIDs, one per scan to be performed.
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* 'indexqual' is a list of index qualifications, also one per scan.
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* Each entry in 'indexqual' is a sublist of qualification expressions with
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1999-08-16 04:17:58 +02:00
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* implicit AND semantics across the sublist items. Only expressions that
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* are usable as indexquals (as determined by indxpath.c) may appear here.
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*
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1999-07-25 01:21:14 +02:00
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* NOTE that the semantics of the top-level list in 'indexqual' is OR
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* combination, while the sublists are implicitly AND combinations!
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*----------
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*/
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1999-08-16 04:17:58 +02:00
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1997-09-07 07:04:48 +02:00
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typedef struct IndexPath
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{
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1997-09-08 04:41:22 +02:00
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Path path;
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List *indexid;
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List *indexqual;
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1999-08-16 04:17:58 +02:00
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/*
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* joinrelids is only used in IndexPaths that are constructed for use
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* as the inner path of a nestloop join. These paths have indexquals
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* that refer to values of other rels, so those other rels must be
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* included in the outer joinrel in order to make a usable join.
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*/
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Relids joinrelids; /* other rels mentioned in indexqual */
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1997-09-08 23:56:23 +02:00
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} IndexPath;
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1997-09-07 07:04:48 +02:00
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1999-11-23 21:07:06 +01:00
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typedef struct TidPath
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{
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Path path;
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List *tideval;
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Relids unjoined_relids; /* some rels not yet part of my Path */
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} TidPath;
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1999-08-16 04:17:58 +02:00
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/*
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* All join-type paths share these fields.
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*/
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typedef struct JoinPath
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1997-09-07 07:04:48 +02:00
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{
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1997-09-08 04:41:22 +02:00
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Path path;
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1997-09-07 07:04:48 +02:00
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1999-08-16 04:17:58 +02:00
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Path *outerjoinpath; /* path for the outer side of the join */
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Path *innerjoinpath; /* path for the inner side of the join */
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} JoinPath;
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/*
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* A nested-loop path needs no special fields.
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*/
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typedef JoinPath NestPath;
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/*
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* A mergejoin path has these fields.
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*
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* Note that the mergeclauses are a subset of the parent relation's
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* restriction-clause list. Any join clauses that are not mergejoinable
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* appear only in the parent's restrict list, and must be checked by a
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* qpqual at execution time.
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*/
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1999-02-12 18:25:05 +01:00
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1997-09-07 07:04:48 +02:00
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typedef struct MergePath
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{
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1999-02-12 18:25:05 +01:00
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JoinPath jpath;
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1999-08-16 04:17:58 +02:00
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List *path_mergeclauses; /* join clauses used for merge */
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/*
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* outersortkeys (resp. innersortkeys) is NIL if the outer path
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* (resp. inner path) is already ordered appropriately for the
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* mergejoin. If it is not NIL then it is a PathKeys list describing
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* the ordering that must be created by an explicit sort step.
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*/
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1997-09-08 04:41:22 +02:00
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List *outersortkeys;
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List *innersortkeys;
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1997-09-08 23:56:23 +02:00
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} MergePath;
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1997-09-07 07:04:48 +02:00
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1999-02-22 20:55:44 +01:00
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/*
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1999-08-16 04:17:58 +02:00
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* A hashjoin path has these fields.
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*
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* The remarks above for mergeclauses apply for hashclauses as well.
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* However, hashjoin does not care what order its inputs appear in,
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* so we have no need for sortkeys.
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1999-02-22 20:55:44 +01:00
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*/
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1996-08-28 03:59:28 +02:00
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1999-08-16 04:17:58 +02:00
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typedef struct HashPath
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1997-09-07 07:04:48 +02:00
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{
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1999-08-16 04:17:58 +02:00
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JoinPath jpath;
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List *path_hashclauses; /* join clauses used for hashing */
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} HashPath;
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1996-08-28 03:59:28 +02:00
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1999-02-22 20:55:44 +01:00
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/*
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1999-07-25 01:21:14 +02:00
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* Restriction clause info.
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1999-08-16 04:17:58 +02:00
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*
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1999-07-25 01:21:14 +02:00
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* We create one of these for each AND sub-clause of a restriction condition
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* (WHERE clause). Since the restriction clauses are logically ANDed, we
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* can use any one of them or any subset of them to filter out tuples,
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* without having to evaluate the rest. The RestrictInfo node itself stores
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* data used by the optimizer while choosing the best query plan.
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1999-08-16 04:17:58 +02:00
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*
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* A restriction clause will appear in the restrictinfo list of a RelOptInfo
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* that describes exactly the set of base relations referenced by the
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* restriction clause. It is not possible to apply the clause at any lower
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* nesting level, and there is little point in delaying its evaluation to
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* higher nesting levels. (The "predicate migration" code was once intended
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* to push restriction clauses up and down the plan tree, but it's dead code
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* and is unlikely to be resurrected in the foreseeable future.)
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*
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* If a restriction clause references more than one base rel, it will also
|
|
|
|
* appear in the JoinInfo list of every RelOptInfo that describes a strict
|
|
|
|
* subset of the base rels mentioned in the clause. The JoinInfo lists are
|
|
|
|
* used to drive join tree building by selecting plausible join candidates.
|
|
|
|
*
|
|
|
|
* In general, the referenced clause might be arbitrarily complex. The
|
|
|
|
* kinds of clauses we can handle as indexscan quals, mergejoin clauses,
|
|
|
|
* or hashjoin clauses are fairly limited --- the code for each kind of
|
|
|
|
* path is responsible for identifying the restrict clauses it can use
|
|
|
|
* and ignoring the rest. Clauses not implemented by an indexscan,
|
|
|
|
* mergejoin, or hashjoin will be placed in the qpqual field of the
|
|
|
|
* final Plan node, where they will be enforced by general-purpose
|
|
|
|
* qual-expression-evaluation code. (But we are still entitled to count
|
|
|
|
* their selectivity when estimating the result tuple count, if we
|
|
|
|
* can guess what it is...)
|
1999-02-22 20:55:44 +01:00
|
|
|
*/
|
1996-08-28 03:59:28 +02:00
|
|
|
|
1999-02-03 21:15:53 +01:00
|
|
|
typedef struct RestrictInfo
|
1997-09-07 07:04:48 +02:00
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
NodeTag type;
|
1997-09-07 07:04:48 +02:00
|
|
|
|
1999-08-16 04:17:58 +02:00
|
|
|
Expr *clause; /* the represented clause of WHERE cond */
|
1997-09-07 07:04:48 +02:00
|
|
|
|
1999-08-16 04:17:58 +02:00
|
|
|
/* only used if clause is an OR clause: */
|
2000-01-09 01:26:47 +01:00
|
|
|
List *subclauseindices; /* indexes matching subclauses */
|
|
|
|
/* subclauseindices is a List of Lists of IndexOptInfos */
|
1997-09-07 07:04:48 +02:00
|
|
|
|
1999-08-16 04:17:58 +02:00
|
|
|
/* valid if clause is mergejoinable, else InvalidOid: */
|
|
|
|
Oid mergejoinoperator; /* copy of clause operator */
|
|
|
|
Oid left_sortop; /* leftside sortop needed for mergejoin */
|
|
|
|
Oid right_sortop; /* rightside sortop needed for mergejoin */
|
1997-09-07 07:04:48 +02:00
|
|
|
|
1999-08-16 04:17:58 +02:00
|
|
|
/* valid if clause is hashjoinable, else InvalidOid: */
|
|
|
|
Oid hashjoinoperator; /* copy of clause operator */
|
|
|
|
} RestrictInfo;
|
1997-09-07 07:04:48 +02:00
|
|
|
|
1999-08-16 04:17:58 +02:00
|
|
|
/*
|
|
|
|
* Join clause info.
|
|
|
|
*
|
|
|
|
* We make a list of these for each RelOptInfo, containing info about
|
|
|
|
* all the join clauses this RelOptInfo participates in. (For this
|
|
|
|
* purpose, a "join clause" is a WHERE clause that mentions both vars
|
|
|
|
* belonging to this relation and vars belonging to relations not yet
|
|
|
|
* joined to it.) We group these clauses according to the set of
|
|
|
|
* other base relations (unjoined relations) mentioned in them.
|
|
|
|
* There is one JoinInfo for each distinct set of unjoined_relids,
|
|
|
|
* and its jinfo_restrictinfo lists the clause(s) that use that set
|
|
|
|
* of other relations.
|
|
|
|
*/
|
1997-09-07 07:04:48 +02:00
|
|
|
|
1998-09-01 05:29:17 +02:00
|
|
|
typedef struct JoinInfo
|
1997-09-07 07:04:48 +02:00
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
NodeTag type;
|
1999-08-16 04:17:58 +02:00
|
|
|
Relids unjoined_relids; /* some rels not yet part of my RelOptInfo */
|
|
|
|
List *jinfo_restrictinfo; /* relevant RestrictInfos */
|
1999-05-26 00:43:53 +02:00
|
|
|
} JoinInfo;
|
1997-09-07 07:04:48 +02:00
|
|
|
|
1996-08-28 03:59:28 +02:00
|
|
|
/*
|
1999-05-25 18:15:34 +02:00
|
|
|
* Stream:
|
1999-02-22 20:55:44 +01:00
|
|
|
* A stream represents a root-to-leaf path in a plan tree (i.e. a tree of
|
|
|
|
* JoinPaths and Paths). The stream includes pointers to all Path nodes,
|
1999-05-25 18:15:34 +02:00
|
|
|
* as well as to any clauses that reside above Path nodes. This structure
|
1999-02-22 20:55:44 +01:00
|
|
|
* is used to make Path nodes and clauses look similar, so that Predicate
|
|
|
|
* Migration can run.
|
|
|
|
*
|
1999-08-16 04:17:58 +02:00
|
|
|
* XXX currently, Predicate Migration is dead code, and so is this node type.
|
|
|
|
* Probably should remove support for it.
|
|
|
|
*
|
1999-02-22 20:55:44 +01:00
|
|
|
* pathptr -- pointer to the current path node
|
|
|
|
* cinfo -- if NULL, this stream node referes to the path node.
|
|
|
|
* Otherwise this is a pointer to the current clause.
|
|
|
|
* clausetype -- whether cinfo is in loc_restrictinfo or pathinfo in the
|
2000-01-09 01:26:47 +01:00
|
|
|
* path node (XXX this is now used only by dead code, which is
|
|
|
|
* good because the distinction no longer exists...)
|
1999-02-22 20:55:44 +01:00
|
|
|
* upstream -- linked list pointer upwards
|
|
|
|
* downstream -- ditto, downwards
|
|
|
|
* groupup -- whether or not this node is in a group with the node upstream
|
|
|
|
* groupcost -- total cost of the group that node is in
|
|
|
|
* groupsel -- total selectivity of the group that node is in
|
|
|
|
*/
|
1996-08-28 03:59:28 +02:00
|
|
|
typedef struct Stream *StreamPtr;
|
|
|
|
|
1997-09-07 07:04:48 +02:00
|
|
|
typedef struct Stream
|
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
NodeTag type;
|
|
|
|
Path *pathptr;
|
1999-02-03 21:15:53 +01:00
|
|
|
RestrictInfo *cinfo;
|
1997-09-08 04:41:22 +02:00
|
|
|
int *clausetype;
|
1999-08-16 04:17:58 +02:00
|
|
|
StreamPtr upstream;
|
|
|
|
StreamPtr downstream;
|
1997-09-08 04:41:22 +02:00
|
|
|
bool groupup;
|
|
|
|
Cost groupcost;
|
2000-01-09 01:26:47 +01:00
|
|
|
Selectivity groupsel;
|
1997-09-08 23:56:23 +02:00
|
|
|
} Stream;
|
1997-09-07 07:04:48 +02:00
|
|
|
|
1998-09-01 06:40:42 +02:00
|
|
|
#endif /* RELATION_H */
|