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https://issues.apache.org/jira/browse/FLINK-27998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17558368#comment-17558368
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Martijn Visser commented on FLINK-27998:
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[~Sergey Nuyanzin] Perhaps it makes sense to team-up with [~jingzhang] since 
she also volunteered via the mailing list and knows Calcite quite well. 
Updating Calcite for Flink is a rather large thing (see 
https://github.com/apache/flink/pull/13577 as the last one) which ideally is 
covered by multiple people

> 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/



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