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https://issues.apache.org/jira/browse/CALCITE-3353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16932081#comment-16932081
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Danny Chan commented on CALCITE-3353:
-------------------------------------

Maybe we should forbidden to match convention(non-logical) nodes for these 
promotion rules.

> 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
>            Priority: Major
>
> Trying to add ProjectJoinTransposeRule to the rule set to optimize sql (using 
> VolcanoPlanner).
> Get the following exception´╝Ü
> 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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