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https://issues.apache.org/jira/browse/CALCITE-3227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-3227:
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Labels: pull-request-available (was: )
> IndexOutOfBound when checking candidate parent match's input ordinal in
> VolcanoRuleCall
> ---------------------------------------------------------------------------------------
>
> Key: CALCITE-3227
> URL: https://issues.apache.org/jira/browse/CALCITE-3227
> Project: Calcite
> Issue Type: Bug
> Reporter: Botong Huang
> Priority: Major
> Labels: pull-request-available
>
> In VolcanoRuleCall.matchRecurse(), when ascending (child operand is matched,
> looking for parent operand match), we want to check that the candidate parent
> relNode indeed has the previously matched relNode as a child with the right
> ordinal. However, some candidate parent can have less number of inputs than
> the parent operand, and thus we hit IndexOutOfBound when trying to grab the
> correct child for checking.
> In the added unit test that repro the bug, we have a union with two inputs of
> class PhysLeafRel. The rule however, matches a union with three inputs, with
> the third child operand matching for PhysLeafRel.class. When a child relNode
> gets matched to the third child operand, we go up trying to see whether the
> union relNode can match the parent. Trying to access the union's third input
> hits the IndexOutOfBound error because the union only has two inputs.
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