Vladimir Ozerov created CALCITE-4616:
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Summary: AggregateUnionTransposeRule causes row type mismatch when
some inputs have unique grouping key
Key: CALCITE-4616
URL: https://issues.apache.org/jira/browse/CALCITE-4616
Project: Calcite
Issue Type: Bug
Affects Versions: 1.26.0
Reporter: Vladimir Ozerov
Consider the following relational tree:
{code}
1: Aggregate[group=a, SUM(b)]
2: Union
3: Input1[a, b, c]
4: Input2[a, b, c]
{code}
It may happen, that {{Input1}} has a unique key on {{[a]}}. In this case,
Apache Calcite, will not install the {{Aggregate}} on top of it, which leads to
the following tree:
1: Aggregate[group=a, SUM(b)]
2: Union
3: Input1[a, b, c]
4: Aggregate[group=a, SUM(b)]
5: Input2[a, b, c]
{code}
Obviously, the tree is incorrect, because {{Union}} inputs now have different
row types.
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