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https://issues.apache.org/jira/browse/CALCITE-3353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16934061#comment-16934061
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Danny Chan commented on CALCITE-3353:
-------------------------------------
Maybe we should give out a list of the rules that should not (non-necessary)
match convention nodes.
> 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
> Labels: pull-request-available
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> 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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