Botong Huang created CALCITE-3227:
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Summary: 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
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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