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Posted to dev@calcite.apache.org by "Pengcheng Xiong (JIRA)" <ji...@apache.org> on 2017/06/19 21:14:00 UTC

[jira] [Created] (CALCITE-1850) Extend UnionMergeRule to deal with more than 2 branches

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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