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Implement the FILTER clause for aggregate function calls.

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This is SQL-standard with a few extensions, namely support for
subqueries and outer references in clause expressions.

catversion bump due to change in Aggref and WindowFunc.

David Fetter, reviewed by Dean Rasheed.
This commit is contained in:
Noah Misch
2013-07-16 20:15:36 -04:00
parent 7a8e9f298e
commit b560ec1b0d
35 changed files with 403 additions and 51 deletions
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14
src/backend/executor/nodeWindowAgg.c
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@ -227,9 +227,23 @@ advance_windowaggregate(WindowAggState *winstate,
int i;
MemoryContext oldContext;
ExprContext *econtext = winstate->tmpcontext;
ExprState *filter = wfuncstate->aggfilter;
oldContext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
/* Skip anything FILTERed out */
if (filter)
{
bool isnull;
Datum res = ExecEvalExpr(filter, econtext, &isnull, NULL);
if (isnull || !DatumGetBool(res))
{
MemoryContextSwitchTo(oldContext);
return;
}
}
/* We start from 1, since the 0th arg will be the transition value */
i = 1;
foreach(arg, wfuncstate->args)