kasakrisz commented on a change in pull request #1096:
URL: https://github.com/apache/hive/pull/1096#discussion_r439922505
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File path: ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java
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@@ -2389,6 +2390,11 @@ private RelNode applyPostJoinOrderingTransform(RelNode
basePlan, RelMetadataProv
final HepProgramBuilder program = new HepProgramBuilder();
+ if
(conf.getBoolVar(ConfVars.HIVE_CARDINALITY_PRESERVING_JOIN_OPTIMIZATION)) {
+ generatePartialProgram(program, false, HepMatchOrder.TOP_DOWN,
+ new HiveCardinalityPreservingJoinRule());
Review comment:
`HiveCardinalityPreservingJoinRule` is not stateless: it extends
`HiveFieldTrimmerRule` which tracks whether it was triggered or not to avoid
unnecessary multiple traversals.
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