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https://issues.apache.org/jira/browse/CALCITE-3149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17085083#comment-17085083
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Haisheng Yuan commented on CALCITE-3149:
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Correct, If the data type is in use, it should not be garbage collected. We
haven't seen any issue in production. But one thing is confirmed that the
global cache seems not necessary.
> CACHE in RelDataTypeFactoryImpl can't be garbage collected
> -----------------------------------------------------------
>
> Key: CALCITE-3149
> URL: https://issues.apache.org/jira/browse/CALCITE-3149
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Haisheng Yuan
> Assignee: Haisheng Yuan
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.21.0
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> Key and Value are pointing to the same object, even with soft value
> references, the objects in CACHE will not be garbage collected.
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