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, 2 insertions, 0 deletions

diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index 4f77016652d..5de5db75821 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -584,6 +584,7 @@ typedef struct AggrefExprState
 {
 	ExprState	xprstate;
 	List	   *args;			/* states of argument expressions */
+	ExprState  *aggfilter;		/* FILTER expression */
 	int			aggno;			/* ID number for agg within its plan node */
 } AggrefExprState;
 
@@ -595,6 +596,7 @@ typedef struct WindowFuncExprState
 {
 	ExprState	xprstate;
 	List	   *args;			/* states of argument expressions */
+	ExprState  *aggfilter;		/* FILTER expression */
 	int			wfuncno;		/* ID number for wfunc within its plan node */
 } WindowFuncExprState;