[jira] [Commented] (CALCITE-2471) RelNode description includes all tree when recomputed

["Laurent Goujon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-2471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16582791#comment-16582791 ] 

Laurent Goujon commented on CALCITE-2471:
-----------------------------------------

Here's my pull request to address the issue: https://github.com/apache/calcite/pull/795

> RelNode description includes all tree when recomputed
> -----------------------------------------------------
>
>                 Key: CALCITE-2471
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2471
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>            Reporter: Laurent Goujon
>            Assignee: Julian Hyde
>            Priority: Major
>
> The initial AbstractRelNode description is `{{typeName#id}}` but when recomputed, it includes all its inputs (and other attributes).
> When creating the final plan, HepPlanner visits each node bottom up, and recomputes the node digest. This causes node description to grow in size, up to the top node which contains basically a string copy of the whole tree. On large trees, this may consume a non-significant amount of memory.
> See email thread: https://lists.apache.org/thread.html/5e71c9f2b4e83865805841708f53471cfab1b5de673e6f162b68edc9@%3Cdev.calcite.apache.org%3E



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