[jira] [Closed] (CALCITE-4129) Support equality check for whole rel plan tree

["Andrei Sereda (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-4129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrei Sereda closed CALCITE-4129.
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Released as part of 1.25 ([68b02dfd4af15bc|https://github.com/apache/calcite/commit/68b02dfd4af15bc94a91a0cd2a30655d04439555])

> Support equality check for whole rel plan tree
> ----------------------------------------------
>
>                 Key: CALCITE-4129
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4129
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Haisheng Yuan
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.25.0
>
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> Currently the only way to check rel node tree deep equality is transforming into String by {{RelOptUtil.toString(rel)}} with {{SqlExplainLevel.EXPPLAN_ATTRIBUTES}}, which is inefficient. One example is RexSubQuery. It has to do it this way, because the rel being reference by RexSubQuery is possibly not yet registered to VolcanoPlanner, and the digest {{equals}} checks the input RelNode by identity (not content). That is OK for RelSubset and HepRelVertex, if the RelNode is already registered in planner, but not for plain RelNode that is outside of planner. Due to this, we have to implement another set of deep equals logic in our system.



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