[jira] [Created] (FLINK-3503) [SQL] ProjectJoinTransposeRule fails to push down project.

[Shang Yuanchun (Jira)]

Chengxiang Li created FLINK-3503:
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             Summary: [SQL] ProjectJoinTransposeRule fails to push down project.
                 Key: FLINK-3503
                 URL: https://issues.apache.org/jira/browse/FLINK-3503
             Project: Flink
          Issue Type: Improvement
            Reporter: Chengxiang Li
            Priority: Minor


{noformat}
    val ds1 = CollectionDataSets.getSmall3TupleDataSet(env).as('a, 'b, 'c)
    val ds2 = CollectionDataSets.get5TupleDataSet(env).as('d, 'e, 'f, 'g, 'h)

    val joinT = ds1.join(ds2).where('b === 'e).select('c, 'g)
{noformat}
For this query, ProjectJoinTransposeRule should pushes a Project past a Join by splitting the projection into a projection on top of each child of the join.



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