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https://issues.apache.org/jira/browse/BEAM-4514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17342234#comment-17342234
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Andrew Pilloud commented on BEAM-4514:
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flattening bugs should be fixed after calcite upgrade.
> [SQL] Enable flattening configuration
> -------------------------------------
>
> Key: BEAM-4514
> URL: https://issues.apache.org/jira/browse/BEAM-4514
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Anton Kedin
> Priority: P3
>
> Currently the calcite projection also flattens the output row in PlannerImpl.
> This causes failure when inserting into a table with a ROW field.
> E.g. `INSERT INTO table (f_row_destination) SELECT f_row_source` will not
> work, as f_row_source will be flattened into separate fields and won't match
> the destination schema
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