Github user hsyuan commented on a diff in the pull request:
https://github.com/apache/incubator-hawq/pull/1189#discussion_r108025017
--- Diff: src/backend/executor/nodeAgg.c ---
@@ -1950,6 +1950,21 @@ ExecInitAgg(Agg *node, EState *estate, int eflags)
* initialize child nodes
*/
outerPlan = outerPlan(node);
+ if (outerPlan->type == T_ExternalScan) {
+ /*
+ * Hack to indicate to PXF when there is an external scan
+ */
+ if (aggstate->aggs && list_length(aggstate->aggs) == 1) {
+ foreach(l, aggstate->aggs) {
+ AggrefExprState *aggrefstate = (AggrefExprState
*) lfirst(l);
+ Aggref *aggref = (Aggref *)
aggrefstate->xprstate.expr;
+ //Only dealing with one agg
+ if (aggref->aggfnoid == 2147 ||
aggref->aggfnoid == 2803) {
--- End diff --
Would be better use `COUNT_ANY_OID` and `COUNT_STAR_OID`...
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