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https://issues.apache.org/jira/browse/FLINK-37861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17958780#comment-17958780
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Timo Walther commented on FLINK-37861:
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The main PR containing the type system changes has been merged. The built-in
functions can come later and don't have to be part of this release.
> FLIP-520: Simplify StructuredType handling
> ------------------------------------------
>
> Key: FLINK-37861
> URL: https://issues.apache.org/jira/browse/FLINK-37861
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / API, Table SQL / Planner
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Major
>
> The motivation of the FLIP is to further extend the range of operations and
> expressions that are SQL serializable. Currently, it is not possible to
> declare a table using CREATE TABLE, creating structured types outside of
> UDFs, using a CAST, or declaring them as part of a @DataTypeHint function
> annotation. Table API’s table descriptors support structured types already.
> https://cwiki.apache.org/confluence/display/FLINK/FLIP-520%3A+Simplify+StructuredType+handling
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