[jira] [Created] (FLINK-3736) Move toRexNode and toAggCall logic into Expressions

[Shang Yuanchun (Jira)]

Yijie Shen created FLINK-3736:
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             Summary: Move toRexNode and toAggCall logic into Expressions
                 Key: FLINK-3736
                 URL: https://issues.apache.org/jira/browse/FLINK-3736
             Project: Flink
          Issue Type: Improvement
          Components: Table API
            Reporter: Yijie Shen
            Priority: Minor


Since we have a one-to-one mapping from Flink Expression to Calcite RexNode, and we will implement more and more expressions to make flink-table a full-fledged module, I think it's worthwhile to let each Expression take care of its own behaviour on conversion to RexNode.



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