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UNION should be implemented via flatten & distinct #18635

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UNION should be implemented via flatten & distinct#18635
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P3dslimprovementsql
@kennknowles

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@kennknowles
kennknowles
opened on Jun 3, 2022

Currently, UNION is implemented as a set operator via CoGroupByKey when a flatten **** distinct will suffice. This also will be compatible with more types of triggers.

Imported from Jira BEAM-3722. Original Jira may contain additional context.
Reported by: kenn.

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