kasakrisz commented on code in PR #5505:
URL: https://github.com/apache/hive/pull/5505#discussion_r1875727213
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ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveProjectSortExchangeTransposeRule.java:
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@@ -88,6 +88,11 @@ public void onMatch(RelOptRuleCall call) {
RelCollation newCollation =
RelCollationTraitDef.INSTANCE.canonize(RelCollationImpl.of(fieldCollations));
List<Integer> newDistributionKeys = getNewRelDistributionKeys(project,
sortExchange.getDistribution());
+ if (newDistributionKeys == null) {
Review Comment:
When there are no distribution keys the project can be safely pushed down
because there are no columns/expressisons that must present in the project
expression list.
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