greenplumn stratnum 源码
greenplumn stratnum 代码
文件路径：/src/include/access/stratnum.h
/*-------------------------------------------------------------------------
*
* stratnum.h
* POSTGRES strategy number definitions.
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/stratnum.h
*
*-------------------------------------------------------------------------
*/
#ifndef STRATNUM_H
#define STRATNUM_H
/*
* Strategy numbers identify the semantics that particular operators have
* with respect to particular operator classes. In some cases a strategy
* subtype (an OID) is used as further information.
*/
typedef uint16 StrategyNumber;
#define InvalidStrategy ((StrategyNumber) 0)
/*
* Strategy numbers for B-tree indexes.
*/
#define BTLessStrategyNumber 1
#define BTLessEqualStrategyNumber 2
#define BTEqualStrategyNumber 3
#define BTGreaterEqualStrategyNumber 4
#define BTGreaterStrategyNumber 5
#define BTMaxStrategyNumber 5
/*
* Strategy numbers for hash indexes. There's only one valid strategy for
* hashing: equality.
*/
#define HTEqualStrategyNumber 1
#define HTMaxStrategyNumber 1
/*
* Strategy numbers common to (some) GiST, SP-GiST and BRIN opclasses.
*
* The first few of these come from the R-Tree indexing method (hence the
* names); the others have been added over time as they have been needed.
*/
#define RTLeftStrategyNumber 1 /* for << */
#define RTOverLeftStrategyNumber 2 /* for &< */
#define RTOverlapStrategyNumber 3 /* for && */
#define RTOverRightStrategyNumber 4 /* for &> */
#define RTRightStrategyNumber 5 /* for >> */
#define RTSameStrategyNumber 6 /* for ~= */
#define RTContainsStrategyNumber 7 /* for @> */
#define RTContainedByStrategyNumber 8 /* for <@ */
#define RTOverBelowStrategyNumber 9 /* for &<| */
#define RTBelowStrategyNumber 10 /* for <<| */
#define RTAboveStrategyNumber 11 /* for |>> */
#define RTOverAboveStrategyNumber 12 /* for |&> */
#define RTOldContainsStrategyNumber 13 /* for old spelling of @> */
#define RTOldContainedByStrategyNumber 14 /* for old spelling of <@ */
#define RTKNNSearchStrategyNumber 15 /* for <-> (distance) */
#define RTContainsElemStrategyNumber 16 /* for range types @> elem */
#define RTAdjacentStrategyNumber 17 /* for -|- */
#define RTEqualStrategyNumber 18 /* for = */
#define RTNotEqualStrategyNumber 19 /* for != */
#define RTLessStrategyNumber 20 /* for < */
#define RTLessEqualStrategyNumber 21 /* for <= */
#define RTGreaterStrategyNumber 22 /* for > */
#define RTGreaterEqualStrategyNumber 23 /* for >= */
#define RTSubStrategyNumber 24 /* for inet >> */
#define RTSubEqualStrategyNumber 25 /* for inet <<= */
#define RTSuperStrategyNumber 26 /* for inet << */
#define RTSuperEqualStrategyNumber 27 /* for inet >>= */
#define RTPrefixStrategyNumber 28 /* for text ^@ */
#define RTMaxStrategyNumber 28
#endif /* STRATNUM_H */
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