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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2000-10-05 19:11:39 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2000-10-05 19:11:39 +0000 |
| commit | 05e3d0ee8666b74f11ffad16f46e372459d6e53e (patch) | |
| tree | b273892bfda60f6bad315e84aaa2e9826e226931 /src/backend/optimizer/prep/prepkeyset.c | |
| parent | 5292637f52c6db8a22f99177f228273cb69fc510 (diff) | |
| download | postgresql-05e3d0ee8666b74f11ffad16f46e372459d6e53e.tar.gz postgresql-05e3d0ee8666b74f11ffad16f46e372459d6e53e.zip | |
Reimplementation of UNION/INTERSECT/EXCEPT. INTERSECT/EXCEPT now meet the
SQL92 semantics, including support for ALL option. All three can be used
in subqueries and views. DISTINCT and ORDER BY work now in views, too.
This rewrite fixes many problems with cross-datatype UNIONs and INSERT/SELECT
where the SELECT yields different datatypes than the INSERT needs. I did
that by making UNION subqueries and SELECT in INSERT be treated like
subselects-in-FROM, thereby allowing an extra level of targetlist where the
datatype conversions can be inserted safely.
INITDB NEEDED!
Diffstat (limited to 'src/backend/optimizer/prep/prepkeyset.c')
| -rw-r--r-- | src/backend/optimizer/prep/prepkeyset.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/backend/optimizer/prep/prepkeyset.c b/src/backend/optimizer/prep/prepkeyset.c index 60166289a59..764697636c7 100644 --- a/src/backend/optimizer/prep/prepkeyset.c +++ b/src/backend/optimizer/prep/prepkeyset.c @@ -20,6 +20,8 @@ bool _use_keyset_query_optimizer = FALSE; +#ifdef ENABLE_KEY_SET_QUERY + static int inspectOpNode(Expr *expr); static int inspectAndNode(Expr *expr); static int inspectOrNode(Expr *expr); @@ -213,3 +215,5 @@ inspectOpNode(Expr *expr) secondExpr = lsecond(expr->args); return (firstExpr && secondExpr && nodeTag(firstExpr) == T_Var && nodeTag(secondExpr) == T_Const); } + +#endif /* ENABLE_KEY_SET_QUERY */ |