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https://issues.apache.org/jira/browse/BEAM-4516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546961#comment-17546961
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Kenneth Knowles commented on BEAM-4516:
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This issue has been migrated to https://github.com/apache/beam/issues/18772
> [SQL] Allow casting to complex types
> ------------------------------------
>
> Key: BEAM-4516
> URL: https://issues.apache.org/jira/browse/BEAM-4516
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Anton Kedin
> Priority: P3
>
> Currently CAST is parsed in the main Calcite's Parser.jj. When parsing the
> target type parameter it only supports primitive types or MULTISET). It's
> impossible to cast to an inline fully specified Row type at the moment
> (Calcite 1.16).
> Probably CREATE TYPE in Calcite 1.17 is worth looking at, it should support
> CAST
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