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https://issues.apache.org/jira/browse/HIVE-25851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17485707#comment-17485707
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Stamatis Zampetakis commented on HIVE-25851:
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The one that came to my mind was CALCITE-2205 but yes its not the only one.
> Replace HiveRelMdPredicate with RelMdPredicate from Calcite
> -----------------------------------------------------------
>
> Key: HIVE-25851
> URL: https://issues.apache.org/jira/browse/HIVE-25851
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Affects Versions: 4.0.0
> Reporter: Alessandro Solimando
> Priority: Major
>
> `HiveRelMdPredicates` was copied from `RelMdPredicates` in Calcite long ago,
> it has few differences which could be ported to the Calcite version, if
> needed.
> The goal of the ticket is to:
> # ascertain which are the additional features in `HiveRelMdPredicates`, port
> them to Calcite if needed
> # drop `HiveRelMdPredicates` in favour of `RelMdPredicates` in order to
> benefit from all the advances in such class
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