Jark Wu created FLINK-14367:

             Summary: Fully support for converting RexNode to Expression
                 Key: FLINK-14367
                 URL: https://issues.apache.org/jira/browse/FLINK-14367
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / Planner
            Reporter: Jark Wu

Currently, the {{RexNodeToExpressionConverter}} in both planners are not fully 
support. There're many RexNodes can not be converted to Expressions.

1) RexFieldAccess -> GET call
2) Literals in interval types and complex types

We should have a comprehensive tests to cover all cases. A good idea is to 
verify with {{ExpressionConverter}} together. 

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