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/*-------------------------------------------------------------------------
*
* cmptype.h
* POSTGRES compare type definitions.
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/cmptype.h
*
*-------------------------------------------------------------------------
*/
#ifndef CMPTYPE_H
#define CMPTYPE_H
/*
* CompareType - fundamental semantics of certain operators
*
* These enum symbols represent the fundamental semantics of certain operators
* that the system needs to have some hardcoded knowledge about. (For
* example, RowCompareExpr needs to know which operators can be determined to
* act like =, <>, <, etc.) Index access methods map (some of) strategy
* numbers to these values so that the system can know about the meaning of
* (some of) the operators without needing hardcoded knowledge of index AM's
* strategy numbering.
*
* XXX Currently, this mapping is not fully developed and most values are
* chosen to match btree strategy numbers, which is not going to work very
* well for other access methods.
*/
typedef enum CompareType
{
COMPARE_INVALID = 0,
COMPARE_LT = 1, /* BTLessStrategyNumber */
COMPARE_LE = 2, /* BTLessEqualStrategyNumber */
COMPARE_EQ = 3, /* BTEqualStrategyNumber */
COMPARE_GE = 4, /* BTGreaterEqualStrategyNumber */
COMPARE_GT = 5, /* BTGreaterStrategyNumber */
COMPARE_NE = 6, /* no such btree strategy */
COMPARE_OVERLAP,
COMPARE_CONTAINED_BY,
} CompareType;
#endif /* CMPTYPE_H */
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