Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20174#discussion_r160301233
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/HashAggregateExec.scala
---
@@ -230,6 +236,7 @@ case class HashAggregateExec(
| private void $doAgg() throws java.io.IOException {
| // initialize aggregation buffer
| $initBufVar
+ | $hasInput = false;
--- End diff --
btw, if `resultExpressions` is empty, we need to check `hasInput`? It
seems it is ok to return an empty iterator in that case?
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