Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/504#discussion_r64064412
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/project/ProjectRecordBatch.java
---
@@ -136,6 +145,10 @@ public VectorContainer getOutgoingContainer() {
@Override
protected IterOutcome doWork() {
+ if (wasNone) {
+ return IterOutcome.NONE;
+ }
+
int incomingRecordCount = incoming.getRecordCount();
if (first && incomingRecordCount == 0) {
--- End diff --
The new logic will handle the case for Project's first outgoing batch. Not
sure whether Drill works properly after the first batch getting data and
building the schema, but the next incoming batch contains empty result. We may
treat as a separate issue for further investigation.
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