UNION does not work with Double
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sql
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Description
The SQL operation UNION does not work on numerical columns such as DOUBLE.
The error shown is related to GroupByKey, but I am not sure why UNION includes any steps that require GroupBy which blocks non-deterministic columns.
Also, would this issue be solved if we implement UNION with a different approach such as BEAM-3721, BEAM-3722 (use flatten instead of CoGroupByKey)?
Imported from Jira [BEAM-7361](https://issues.apache.org/jira/browse/BEAM-7361). Original Jira may contain additional context.
Reported by: mizokc.
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