diff options
| 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/executor/execUtils.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/executor/execUtils.c')
| -rw-r--r-- | src/backend/executor/execUtils.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/backend/executor/execUtils.c b/src/backend/executor/execUtils.c index b89f4015970..9702b1cf0aa 100644 --- a/src/backend/executor/execUtils.c +++ b/src/backend/executor/execUtils.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/executor/execUtils.c,v 1.109 2004/01/22 02:23:21 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/executor/execUtils.c,v 1.110 2004/03/17 20:48:42 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -306,6 +306,9 @@ CreateExprContext(EState *estate) econtext->ecxt_aggvalues = NULL; econtext->ecxt_aggnulls = NULL; + econtext->caseValue_datum = (Datum) 0; + econtext->caseValue_isNull = true; + econtext->domainValue_datum = (Datum) 0; econtext->domainValue_isNull = true; |