PubSubTableProvider tries to set windows after GroupByKey
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bug
dsl
P3
sql
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- Java
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Description
A SqlTransform may contain a GroupByKey in the global window, this prevents setting windows afterwards. The PubSubTableProvider tries anyway.
This was exposed by a INSERT INTO pubsub VALUES (1), (2), which implicitly becomes INSERT INTO pubsub SELECT 1 UNION SELECT 2. This then becomes a GroupByKey union.
For now I'm going to simplify the test.
Imported from Jira [BEAM-12853](https://issues.apache.org/jira/browse/BEAM-12853). Original Jira may contain additional context.
Reported by: apilloud.
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