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Posted to issues@calcite.apache.org by "Lai Zhou (JIRA)" <ji...@apache.org> on 2019/04/03 01:59:00 UTC

[jira] [Updated] (CALCITE-2973) Allow theta joins to be executed using a merge join algorithm

     [ https://issues.apache.org/jira/browse/CALCITE-2973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lai Zhou updated CALCITE-2973:
------------------------------
    Summary: Allow theta joins to be executed using a merge join algorithm  (was: Make EnumerableMergeJoinRule to support a theta join)

> Allow theta joins to be executed using a merge join algorithm
> -------------------------------------------------------------
>
>                 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
>            Priority: Minor
>
> 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 apply merge-join or hash-join rule for a theta join, it will improve the performance greatly.



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