Github user hyunsik commented on a diff in the pull request:
https://github.com/apache/tajo/pull/593#discussion_r34441081
--- Diff: tajo-common/src/main/java/org/apache/tajo/util/Pair.java ---
@@ -24,11 +24,20 @@
private T1 first;
private T2 second;
+ public Pair() {
--- End diff --
It is only used for JoinGraphContext::getCachedOrNewJoinEdge. It would be
better if JoinGraphContext::getCachedOrNewJoinEdge creates a new instance for
Pair instead of reusing a member variable.
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