diff options
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/executor/execExpr.h | 2 | ||||
| -rw-r--r-- | src/include/nodes/primnodes.h | 41 |
2 files changed, 28 insertions, 15 deletions
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h index 8019e5490e9..1e42c131781 100644 --- a/src/include/executor/execExpr.h +++ b/src/include/executor/execExpr.h @@ -494,7 +494,7 @@ typedef struct ExprEvalStep /* for EEOP_ROWCOMPARE_FINAL */ struct { - RowCompareType rctype; + CompareType cmptype; } rowcompare_final; /* for EEOP_MINMAX */ diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h index 9c2957eb546..2893dba31c3 100644 --- a/src/include/nodes/primnodes.h +++ b/src/include/nodes/primnodes.h @@ -1436,6 +1436,31 @@ typedef struct RowExpr } RowExpr; /* + * 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 the values are + * chosen to match btree strategy numbers, which is not going to work very + * well for other access methods. + */ +typedef enum CompareType +{ + 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 */ +} CompareType; + +/* * RowCompareExpr - row-wise comparison, such as (a, b) <= (1, 2) * * We support row comparison for any operator that can be determined to @@ -1446,26 +1471,14 @@ typedef struct RowExpr * * A RowCompareExpr node is only generated for the < <= > >= cases; * the = and <> cases are translated to simple AND or OR combinations - * of the pairwise comparisons. However, we include = and <> in the - * RowCompareType enum for the convenience of parser logic. + * of the pairwise comparisons. */ -typedef enum RowCompareType -{ - /* Values of this enum are chosen to match btree strategy numbers */ - ROWCOMPARE_LT = 1, /* BTLessStrategyNumber */ - ROWCOMPARE_LE = 2, /* BTLessEqualStrategyNumber */ - ROWCOMPARE_EQ = 3, /* BTEqualStrategyNumber */ - ROWCOMPARE_GE = 4, /* BTGreaterEqualStrategyNumber */ - ROWCOMPARE_GT = 5, /* BTGreaterStrategyNumber */ - ROWCOMPARE_NE = 6, /* no such btree strategy */ -} RowCompareType; - typedef struct RowCompareExpr { Expr xpr; /* LT LE GE or GT, never EQ or NE */ - RowCompareType rctype; + CompareType cmptype; /* OID list of pairwise comparison ops */ List *opnos pg_node_attr(query_jumble_ignore); /* OID list of containing operator families */ |