Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/839#discussion_r44934021
--- Diff:
tajo-plan/src/main/java/org/apache/tajo/plan/logical/DistinctGroupbyNode.java
---
@@ -56,21 +57,21 @@ public DistinctGroupbyNode(int pid) {
@Override
public boolean hasTargets() {
- return targets.length > 0;
+ return !targets.isEmpty();
--- End diff --
This code involves a potential NPE.
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