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https://issues.apache.org/jira/browse/BEAM-9210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17548363#comment-17548363
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Danny McCormick commented on BEAM-9210:
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This issue has been migrated to https://github.com/apache/beam/issues/20005
> Deprecate and remove "nested" schemas for pubsub tables
> -------------------------------------------------------
>
> Key: BEAM-9210
> URL: https://issues.apache.org/jira/browse/BEAM-9210
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Brian Hulette
> Priority: P3
>
> Context:
> https://lists.apache.org/thread.html/bf4c37f21bda194d7f8c40f6e7b9a776262415755cc1658412af3c76%40%3Cdev.beam.apache.org%3E
> Currently we support two styles of schema in pubsub table definitions, a new
> "flattened" schema, as well as the original "nested" schema. The flattened
> style is preferred, but it currently provides no way to read or write pubsub
> message attributes, so switching over to it completely would be a regression.
> When flattened schemas support mapping to attributes, we should remove the
> nested style.
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