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https://issues.apache.org/jira/browse/BEAM-6112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16766713#comment-16766713
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Rui Wang commented on BEAM-6112:
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There is a related stackoverflow question:
https://stackoverflow.com/questions/54651784/rexcall-cannot-be-cast-to-rexinputref-exception-in-apache-beam-sql
> SQL could support equijoins on complex expressions, not just column refs
> ------------------------------------------------------------------------
>
> Key: BEAM-6112
> URL: https://issues.apache.org/jira/browse/BEAM-6112
> Project: Beam
> Issue Type: New Feature
> Components: dsl-sql
> Reporter: Kenneth Knowles
> Priority: Major
>
> Currently a join such as {{CAST(A.x AS BIGINT) = B.y}} will fail, along with
> other similar simple expressions. We only support joining directly on
> immediate column references. It can be worked around by inserting a WITH
> clause for the intermediate value.
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