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https://issues.apache.org/jira/browse/CALCITE-6268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17818013#comment-17818013
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Ulrich Kramer commented on CALCITE-6268:
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We would like to implement a special caching of the tables. Our database
contains thousands of schemas with more than 500000 tables.
> Support implementing custom JdbcSchema
> --------------------------------------
>
> Key: CALCITE-6268
> URL: https://issues.apache.org/jira/browse/CALCITE-6268
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Affects Versions: 1.36.0
> Reporter: Ulrich Kramer
> Priority: Major
>
> Currently, it's not possible to implement a custom {{JdbcSchema}} because of
> the explicit type check in {{CalciteSchema::unwrap}}
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