apilloud edited a comment on pull request #15469:
URL: https://github.com/apache/beam/pull/15469#issuecomment-914584242
Before the calcite upgrade this plan was produced:
```
BeamIOSinkRel(table=[[beam, message]], operation=[INSERT],
flattened=[true])
LogicalValues(tuples=[[{ 1970-01-01 00:00:00.001, 'person1', 80, true
}, { 1970-01-01 00:00:00.002, 'person2', 70, false }]])
```
After the calcite upgrade this plan was produced:
```
BeamIOSinkRel(table=[[beam, message]], operation=[INSERT],
flattened=[true])
LogicalUnion(all=[true])
LogicalProject(EXPR$0=[1970-01-01 00:00:00.001:TIMESTAMP(6)],
EXPR$1=['person1'], EXPR$2=[80], EXPR$3=[true])
LogicalValues(tuples=[[{ 0 }]])
LogicalProject(EXPR$0=[1970-01-01 00:00:00.002:TIMESTAMP(6)],
EXPR$1=['person2'], EXPR$2=[70], EXPR$3=[false])
LogicalValues(tuples=[[{ 0 }]])
```
The LogicalUnion gets turned into BeamUnionRel, which eventually becomes a
CoGroup. Calcite could probably produce a simpler plan (we'd need to write or
enable some more optimizer rules) but PubSubTableProvider is also broken here
(it shouldn't depend on the pipeline not containing a CoGroup).
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