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https://issues.apache.org/jira/browse/BEAM-8039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547961#comment-17547961
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Danny McCormick commented on BEAM-8039:
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This issue has been migrated to https://github.com/apache/beam/issues/19617
> SUM(CASE WHEN xxx THEN 1 ELSE 0)
> --------------------------------
>
> Key: BEAM-8039
> URL: https://issues.apache.org/jira/browse/BEAM-8039
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql-zetasql
> Reporter: Rui Wang
> Priority: P3
>
> java.lang.RuntimeException: Aggregate function only accepts Column Reference
> or CAST(Column Reference) as its input.
> I was able to rewrite SQL using WITH statement, and it seemed to work, but
> requires us rewriting a lot of queries and makes them pretty much unreadable.
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