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Posted to issues@calcite.apache.org by "Vladimir Sitnikov (Jira)" <ji...@apache.org> on 2020/04/16 16:25:00 UTC

[jira] [Commented] (CALCITE-3932) Make data type cache thread local, non-evictable

    [ https://issues.apache.org/jira/browse/CALCITE-3932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17085073#comment-17085073 ] 

Vladimir Sitnikov commented on CALCITE-3932:
--------------------------------------------

Should the cache be {{per-memo}}? E.g. for re-entrancy purposes.

> Make data type cache thread local, non-evictable
> ------------------------------------------------
>
>                 Key: CALCITE-3932
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3932
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Haisheng Yuan
>            Priority: Major
>
> Data type can be evicted out of cache, which is global, thread-safe. `=` based type comparison may suffer from cache eviction. 
> It seems not necessary to cache them globally, because most of them are RelRecordType, which is query dependent, not sharable between different queries.



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