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Posted to issues@calcite.apache.org by "Botong Huang (Jira)" <ji...@apache.org> on 2021/02/28 02:01:00 UTC

[jira] [Updated] (CALCITE-4514) [CALCITE-4514] Fine tune the merge order of two RelSets

     [ https://issues.apache.org/jira/browse/CALCITE-4514?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Botong Huang updated CALCITE-4514:
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    Summary: [CALCITE-4514] Fine tune the merge order of two RelSets  (was: Fine tune the merge order of two RelSets, cache RelSet's childSet computation)

> [CALCITE-4514] Fine tune the merge order of two RelSets
> -------------------------------------------------------
>
>                 Key: CALCITE-4514
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4514
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Botong Huang
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> When merging two relsets, we have two preferences: 
> 1. Merge parent relset into child relset
> 2. Merge newer relset into older relset
> Currently, when the two relsets are parent set of each other, we randomly pick a merge order without checking the second condition above. For performance reasons, we should, to avoid unnecessary churn. 



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