rbalamohan commented on a change in pull request #1485:
URL: https://github.com/apache/hive/pull/1485#discussion_r486787799
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/SortedDynPartitionOptimizer.java
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@@ -284,6 +285,11 @@ public Object process(Node nd, Stack<Node> stack,
NodeProcessorCtx procCtx,
// Create ReduceSink operator
ReduceSinkOperator rsOp = getReduceSinkOp(partitionPositions,
sortPositions, sortOrder, sortNullOrder,
allRSCols, bucketColumns, numBuckets, fsParent,
fsOp.getConf().getWriteType());
+ // we have to make sure not to reorder the child operators as it might
cause weird behavior in the tasks at
+ // the same level. when there is auto stats gather at the same level as
another operation then it might
+ // cause unnecessary preemption. Maintaining the order here to avoid
such preemption and possible errors
Review comment:
Plz add TEZ-3296 as ref if possible.
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