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  1. Calcite
  2. CALCITE-1850

Extend UnionMergeRule to deal with more than 2 branches

    Details

    • Type: New Feature
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.13.0
    • Component/s: core
    • Labels:
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      Description

      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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            • Assignee:
              pxiong Pengcheng Xiong
              Reporter:
              pxiong Pengcheng Xiong
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              • Created:
                Updated:
                Resolved: