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https://issues.apache.org/jira/browse/FLINK-27998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17619278#comment-17619278
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Martijn Visser commented on FLINK-27998:
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[~godfreyhe] We deliberately kept them open because most of the individual
tickets have notes on what's relevant for Flink to change when performing the
upgrade to that version.
> Upgrade Calcite version to 1.30
> -------------------------------
>
> Key: FLINK-27998
> URL: https://issues.apache.org/jira/browse/FLINK-27998
> Project: Flink
> Issue Type: Technical Debt
> Components: Table SQL / API, Table SQL / Runtime
> Reporter: Martijn Visser
> Priority: Major
>
> The latest available version of Calcite is currently 1.30. We already need to
> execute the rework that was planned when upgrading to Calcite 1.27
> FLINK-20873 and when upgrading to Calcite 1.28 FLINK-21239
> When doing this upgrade, we should do this to the last available version.
> This is needed to resolve multiple bugs.
> Additional note: Flink currently uses Calcite 1.26.0 which has this note on
> the release page:
> {{Warning: Calcite 1.26.0 has severe issues with RexNode simplification
> caused by SEARCH operator ( wrong data from query optimization like in
> CALCITE-4325, CALCITE-4352, NullPointerException), so use 1.26.0 for
> development only, and beware that Calcite 1.26.0 might corrupt your data.}}
> https://calcite.apache.org/news/2020/10/06/release-1.26.0/
> The following files should be removed from the Flink code base when upgrading
> calcite to 1.30.0
> in `org.apahce.calcite.rel.core`:
> * Correlate
> * Filter
> * Intersect
> * Minus
> * SetOp
> * Sort
> * Union
> * Values
> * Window
> in `org.apahce.calcite.rel.hint`:
> * HintPredicates
> * NodeTypeHintPredicate
> in `org.apahce.calcite.rel.logical`:
> * LogicalCorrelate
> * LogicalFilter
> * LogicalIntersect
> * LogicalMinus
> * LogicalSort
> * LogicalUnion
> * LogicalValues
> * LogicalWindow
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