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https://issues.apache.org/jira/browse/CALCITE-3085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16846271#comment-16846271
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Laurent Goujon commented on CALCITE-3085:
-----------------------------------------
Alternative would be to create a variant of the class without the stack and
move Calcite classes over, but like I said, didn't find usage of that field
(and it seems we don't have a strong policy of never breaking compatibility,
although we tried to avoid to).
> Unused stack field in RelShuttleImpl
> ------------------------------------
>
> Key: CALCITE-3085
> URL: https://issues.apache.org/jira/browse/CALCITE-3085
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Laurent Goujon
> Assignee: Laurent Goujon
> Priority: Major
>
> {{RelShuttleImpl}} class has a protected {{stack}} field which is being
> populated when going over children, but those content is actually never used.
> In Calcite code base, no subclasses are actually using the content of the
> stack ({{CorelMapBuilder}} is populating the stack but does not read the
> content back either).
> Searching code on github didn't show any usage of it either (but this is not
> foolprof).
> As maintaining this stack has a non-negligible impact on memory/performance,
> I would suggest to remove the field.
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