Jark Wu created FLINK-14716:
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             Summary: Cooperate computed column with project push down
                 Key: FLINK-14716
                 URL: https://issues.apache.org/jira/browse/FLINK-14716
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
            Reporter: Jark Wu


In FLINK-14665, we supported computed column in planner. However, the 
implementation of {{TableSourceTable#getRowType}} will include computed columns 
which is possibly not right, because computed column is generated in the 
downstream Project, not in the source scan. 

This is possibly lead to errors when push project into source scan which will 
call {{TableSourceTable#getRowType}} in the rule. Currently, all the tests are 
passed because we don't have a test to cover this, i.e. computed column on a 
projectable TableSource. We should at least add a test to cover this. 



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