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https://issues.apache.org/jira/browse/BEAM-12647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17385190#comment-17385190
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Andrew Pilloud commented on BEAM-12647:
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I believe BEAM-10817 suggests that is the answer as well. That sounds
reasonable. My only concern is that we don't get into a state where the two
paths return different answers.
> Aggregations on empty pcoll don't return a value.
> -------------------------------------------------
>
> Key: BEAM-12647
> URL: https://issues.apache.org/jira/browse/BEAM-12647
> Project: Beam
> Issue Type: Bug
> Components: dsl-sql, dsl-sql-zetasql
> Reporter: Kyle Weaver
> Priority: P3
>
> {{For example, "SELECT COUNT(\*) FROM table_empty" should return 0, but
> instead it returns no value.}}
> cc [~benglez] [~apilloud]
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