Github user blrunner commented on a diff in the pull request:
https://github.com/apache/tajo/pull/136#discussion_r18262290
--- Diff:
tajo-core/src/main/java/org/apache/tajo/master/querymaster/SubQuery.java ---
@@ -816,9 +820,30 @@ public static int calculateShuffleOutputNum(SubQuery
subQuery, DataChannel chann
if (grpNode.getType() == NodeType.GROUP_BY) {
hasGroupColumns =
((GroupbyNode)grpNode).getGroupingColumns().length > 0;
} else if (grpNode.getType() == NodeType.DISTINCT_GROUP_BY) {
- hasGroupColumns =
((DistinctGroupbyNode)grpNode).getGroupingColumns().length > 0;
+ // Find current distinct stage node.
+ DistinctGroupbyNode distinctNode =
PlannerUtil.findMostBottomNode(subQuery.getBlock().getPlan(),
NodeType.DISTINCT_GROUP_BY);
+ if (distinctNode == null) {
+ LOG.warn(subQuery.getId() + ", Can't find current
DistinctGroupbyNode");
+ distinctNode = (DistinctGroupbyNode)grpNode;
--- End diff --
I found a bug on production cluster. So, I had to add above codes.
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