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https://issues.apache.org/jira/browse/BEAM-4522?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kenneth Knowles reassigned BEAM-4522:
-------------------------------------
Assignee: (was: Kenneth Knowles)
> Re-enable CalcRemoveRule
> ------------------------
>
> Key: BEAM-4522
> URL: https://issues.apache.org/jira/browse/BEAM-4522
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Kenneth Knowles
> Priority: Major
>
> BEAM-4449 replaces our use of {{Project}} and {{Filter}} with a compound
> operation {{Calc}} via these rules:
> - FilterToCalcRule.INSTANCE,
> - ProjectToCalcRule.INSTANCE,
> Which then allows these optimizations:
> - FilterCalcMergeRule.INSTANCE,
> - ProjectCalcMergeRule.INSTANCE,
> - CalcRemoveRule.INSTANCE,
> - CalcMergeRule.INSTANCE,
> This always hits assertion errors in the VolcanoPlanner when CalcRemoveRule
> is invoked, because:
> - LogicalCalc.create always results in a composite collation trait
> - VolcanoPlanner asserts that there are no composite traits
> - There's no simplify() in between the two (I'm not sure there can be)
> The stack trace (Calcite 1.16.0) is this:
> java.lang.AssertionError
> at
> org.apache.calcite.plan.volcano.VolcanoPlanner.changeTraits(VolcanoPlanner.java:546)
> at org.apache.calcite.plan.RelOptRule.convert(RelOptRule.java:540)
> at
> org.apache.calcite.rel.rules.CalcRemoveRule.onMatch(CalcRemoveRule.java:65)
> at
> org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:212)
> at
> org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp(VolcanoPlanner.java:650)
> at
> org.apache.calcite.tools.Programs$RuleSetProgram.run(Programs.java:368)
> at
> org.apache.calcite.prepare.PlannerImpl.transform(PlannerImpl.java:336)
> at
> org.apache.beam.sdk.extensions.sql.impl.BeamQueryPlanner.convertToBeamRel(BeamQueryPlanner.java:135)
> We can actually make progress by disabling CalcRemoveRule in a couple of
> places. Filing this ticket to track turning it back on since there is no real
> reason we shouldn't have it.
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