Pengcheng Xiong created CALCITE-1850:
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Summary: Extend UnionMergeRule to deal with more than 2 branches
Key: CALCITE-1850
URL: https://issues.apache.org/jira/browse/CALCITE-1850
Project: Calcite
Issue Type: New Feature
Reporter: Pengcheng Xiong
Assignee: Pengcheng Xiong
Current Calcite can only deal with the case when call.rel(2) is a setop and
topOp's input size is 2. See L116 in
core/src/main/java/org/apache/calcite/rel/rules/UnionMergeRule.java. The test
cases introduced in [CALCITE-1448] can only deal with 2 levels of unions. When
we are trying to apply this rule to Hive, we found its limitation when we have
multi-levels (>2) of unions. (e.g. union30.q in Hive test case). This jira is
trying to extend that rule to deal with more levels.
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