Beam SQL RAND(seed) function isn't compatible with dofn
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sql
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Description
We currently wrap the RAND(seed) operator with a normal dofn, but that isn't actually valid because we don't process the rows in a single instance of that dofn. We should revisit if this is something we even want to support.
Imported from Jira [BEAM-5275](https://issues.apache.org/jira/browse/BEAM-5275). Original Jira may contain additional context.
Reported by: apilloud.
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