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Posted to issues@calcite.apache.org by "Lai Zhou (JIRA)" <ji...@apache.org> on 2019/04/02 02:30:01 UTC

[jira] [Created] (CALCITE-2973) make EnumerableMergeJoinRule to support a theta join

Lai Zhou created CALCITE-2973:
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             Summary: make EnumerableMergeJoinRule to support a theta join
                 Key: CALCITE-2973
                 URL: https://issues.apache.org/jira/browse/CALCITE-2973
             Project: Calcite
          Issue Type: New Feature
          Components: core
    Affects Versions: 1.19.0
            Reporter: Lai Zhou


Now the EnumerableMergeJoinRule only supports an inner and equi join.

If users make a theta-join query  for a large dataset (such as 10000*10000), the nested loop join process will take dozens of time than the sort-merge join process .

So, if we can support merge-join rule for a theta join, it will bring a lot of benefits .



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