kasakrisz commented on code in PR #4864:
URL: https://github.com/apache/hive/pull/4864#discussion_r1400585055
##########
ql/src/java/org/apache/hadoop/hive/ql/optimizer/ConvertJoinMapJoin.java:
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@@ -755,6 +757,20 @@ private boolean checkConvertJoinSMBJoin(JoinOperator
joinOp, OptimizeTezProcCont
LOG.debug("External table {} found in join and also could not provide
statistics - disabling SMB join.", sb);
return false;
}
+ // GBY operators buffers one record. These are processed when
ReduceRecordSources flushes the operator tree
+ // when end of record stream reached. If the tree has more than two GBY
operators CommonMergeJoinOperator can
+ // not process all buffered records.
+ // HIVE-27788
+ if (parentOp.getParentOperators() != null) {
+ for (Operator<?> grandParent : parentOp.getParentOperators()) {
+ if (hasMoreOperatorsThan(grandParent, GroupByOperator.class, 2)) {
+ LOG.info("We cannot convert to SMB join " +
+ "because one of the join branches has more than one Group by
operators in the same reducer.");
Review Comment:
changed limit to 1
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