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https://issues.apache.org/jira/browse/CALCITE-4056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17139067#comment-17139067
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Haisheng Yuan commented on CALCITE-4056:
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[~danny0405] I don't mind the code is reverted, in case someone does't agree on
the change, this is also the way how we collaborate in Apache community. But
would you please keep the git commit history?
> Remove Digest from RelNode and RexNode
> --------------------------------------
>
> Key: CALCITE-4056
> URL: https://issues.apache.org/jira/browse/CALCITE-4056
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
> Fix For: 1.24.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> The digest is used everywhere (RelNode, RexNode, DataType), causing OOM
> easily for large queries or with complex expressions. Datatype is cached in
> global interner and can be reused. Unlike RelNode, RexNode is not stored in
> MEMO as a GROUP, causing it can't be shared. This makes Calcite can't scale
> for large queries, e.g. CALCITE-3784.
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