[jira] [Created] (FLINK-4605) Add an expression that returns the return type of an expression

[Timo Walther (JIRA)]

Timo Walther created FLINK-4605:
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             Summary: Add an expression that returns the return type of an 
expression
                 Key: FLINK-4605
                 URL: https://issues.apache.org/jira/browse/FLINK-4605
             Project: Flink
          Issue Type: New Feature
          Components: Table API & SQL
            Reporter: Timo Walther


Esp. for Java users of the Table API it is hard to obtain the return type of an 
expression. I propose to implement an expression that returns the type of an 
input expression as a string.

{{myLong.getType()}} could call the toString method of TypeInformation.

This could also be useful to distinguish between different subtypes of POJOs 
etc.



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