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https://issues.apache.org/jira/browse/FLINK-20873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17335546#comment-17335546
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Jark Wu commented on FLINK-20873:
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Also related to modifcations of planner, cc [~godfreyhe]
> Upgrade Calcite version to 1.27
> -------------------------------
>
> Key: FLINK-20873
> URL: https://issues.apache.org/jira/browse/FLINK-20873
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API, Table SQL / Planner
> Reporter: Jark Wu
> Priority: Major
> Labels: stale-major
>
> The following files should be removed from the Flink code base during an
> upgrade:
> - org.apache.calcite.rex.RexSimplify
> - org.apache.calcite.sql.SqlMatchRecognize
> - org.apache.calcite.sql.SqlTableRef
> - org.apache.calcite.sql2rel.RelDecorrelator
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