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src/include/access/cmptype.h
44 строки
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Bruce Momjian
Update copyright for 2026
01 янв 2026, 21:24
01 янв 2026, 21:24
451c439
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/*------------------------------------------------------------------------- * * cmptype.h * POSTGRES compare type definitions. * * Portions Copyright (c) 1996-2026, 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 */