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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2004-03-17 20:48:43 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2004-03-17 20:48:43 +0000 |
| commit | 55f7c3300d164d370d28b127210223d078da524d (patch) | |
| tree | e5c91b7d50eef3b40dd395e3ecce877bb6663636 /src/backend/nodes/outfuncs.c | |
| parent | 8c702ea7ace30026dfff4f2e514027cd4d6d7579 (diff) | |
| download | postgresql-55f7c3300d164d370d28b127210223d078da524d.tar.gz postgresql-55f7c3300d164d370d28b127210223d078da524d.zip | |
Reimplement CASE val WHEN compval1 THEN ... WHEN compval2 THEN ... END
so that the 'val' is computed only once, per recent discussion. The
speedup is not much when 'val' is just a simple variable, but could be
significant for larger expressions. More importantly this avoids issues
with multiple evaluations of a volatile 'val', and it allows the CASE
expression to be reverse-listed in its original form by ruleutils.c.
Diffstat (limited to 'src/backend/nodes/outfuncs.c')
| -rw-r--r-- | src/backend/nodes/outfuncs.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c index 93afd868f87..4db6517cd76 100644 --- a/src/backend/nodes/outfuncs.c +++ b/src/backend/nodes/outfuncs.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.232 2004/01/31 05:09:40 neilc Exp $ + * $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.233 2004/03/17 20:48:42 tgl Exp $ * * NOTES * Every node type that can appear in stored rules' parsetrees *must* @@ -806,6 +806,15 @@ _outCaseWhen(StringInfo str, CaseWhen *node) } static void +_outCaseTestExpr(StringInfo str, CaseTestExpr *node) +{ + WRITE_NODE_TYPE("CASETESTEXPR"); + + WRITE_OID_FIELD(typeId); + WRITE_INT_FIELD(typeMod); +} + +static void _outArrayExpr(StringInfo str, ArrayExpr *node) { WRITE_NODE_TYPE("ARRAY"); @@ -1701,6 +1710,9 @@ _outNode(StringInfo str, void *obj) case T_CaseWhen: _outCaseWhen(str, obj); break; + case T_CaseTestExpr: + _outCaseTestExpr(str, obj); + break; case T_ArrayExpr: _outArrayExpr(str, obj); break; |