[jira] [Created] (CALCITE-3353) ProjectJoinTransposeRule caused AssertionError when creating a new Join

["TANG Wen-hui (Jira)" <ji...@apache.org>]

TANG Wen-hui created CALCITE-3353:
-------------------------------------

             Summary: ProjectJoinTransposeRule caused AssertionError when creating a new Join
                 Key: CALCITE-3353
                 URL: https://issues.apache.org/jira/browse/CALCITE-3353
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.20.0
            Reporter: TANG Wen-hui
            Assignee: TANG Wen-hui


Trying to add ProjectJoinTransposeRule to the rule set to optimize sql (using VolcanoPlanner).

Get the following exception：

Caused by: java.lang.AssertionErrorCaused by: java.lang.AssertionError at org.apache.calcite.adapter.enumerable.EnumerableMergeJoin.<init>(EnumerableMergeJoin.java:72) at org.apache.calcite.adapter.enumerable.EnumerableMergeJoin.copy(EnumerableMergeJoin.java:112) at org.apache.calcite.adapter.enumerable.EnumerableMergeJoin.copy(EnumerableMergeJoin.java:59) at org.apache.calcite.rel.rules.ProjectJoinTransposeRule.onMatch(ProjectJoinTransposeRule.java:155) at org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:208) at org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp(VolcanoPlanner.java:703) at org.apache.calcite.tools.Programs.lambda$standard$7(Programs.java:466) at org.apache.calcite.tools.Programs$SequenceProgram.run(Programs.java:528) at org.apache.calcite.prepare.Prepare.optimize(Prepare.java:196) at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:416) at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:310) at org.apache.calcite.prepare.CalcitePrepareImpl.prepare2_(CalcitePrepareImpl.java:830) at org.apache.calcite.prepare.CalcitePrepareImpl.prepare_(CalcitePrepareImpl.java:610) at org.apache.calcite.prepare.CalcitePrepareImpl.prepareSql(CalcitePrepareImpl.java:580) at org.apache.calcite.jdbc.CalciteConnectionImpl.parseQuery(CalciteConnectionImpl.java:247) at org.apache.calcite.jdbc.CalciteMetaImpl.prepareAndExecute(CalciteMetaImpl.java:711) 
... 22 more

This is because the ProjectJoinTransposeRule can match multiple types of Join and ProjectJoinTransposeRule creates a new Join using the join.copy() method. When the rule applied to EnumerableMergeJoin, and the new Join created by this rule may not meet the requirements of EnumerableMergeJoin.

{code:java}
  EnumerableMergeJoin(
      RelOptCluster cluster,
      RelTraitSet traits,
      RelNode left,
      RelNode right,
      RexNode condition,
      Set<CorrelationId> variablesSet,
      JoinRelType joinType) {
    super(cluster, traits, left, right, condition, variablesSet, joinType);
    final List<RelCollation> collations =
        traits.getTraits(RelCollationTraitDef.INSTANCE);
    assert collations == null || RelCollations.contains(collations, joinInfo.leftKeys);
  }
{code}




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