Implement the FILTER clause for aggregate function calls.

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.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/test/regress/sql/window.sql b/src/test/regress/sql/window.sql
index 769be0fdc61..6ee3696da1c 100644
--- a/src/test/regress/sql/window.sql
+++ b/src/test/regress/sql/window.sql
@@ -264,5 +264,13 @@ SELECT ntile(0) OVER (ORDER BY ten), ten, four FROM tenk1;
 
 SELECT nth_value(four, 0) OVER (ORDER BY ten), ten, four FROM tenk1;
 
+-- filter
+
+SELECT sum(salary), row_number() OVER (ORDER BY depname), sum(
+    sum(salary) FILTER (WHERE enroll_date > '2007-01-01')
+) FILTER (WHERE depname <> 'sales') OVER (ORDER BY depname DESC) AS "filtered_sum",
+    depname
+FROM empsalary GROUP BY depname;
+
 -- cleanup
 DROP TABLE empsalary;