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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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6
src/backend/executor/execUtils.c
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@ -649,9 +649,9 @@ get_last_attnums(Node *node, ProjectionInfo *projInfo)
}
/*
* Don't examine the arguments of Aggrefs or WindowFuncs, because those do
* not represent expressions to be evaluated within the overall
* targetlist's econtext.
* Don't examine the arguments or filters of Aggrefs or WindowFuncs,
* because those do not represent expressions to be evaluated within the
* overall targetlist's econtext.
*/
if (IsA(node, Aggref))
return false;