[jira] [Created] (FLINK-4109) Change the name of ternary condition operator 'eval' to '?'

["Jark Wu (JIRA)" <ji...@apache.org>]

Jark Wu created FLINK-4109:
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             Summary: Change the name of ternary condition operator  'eval' to  '?'  
                 Key: FLINK-4109
                 URL: https://issues.apache.org/jira/browse/FLINK-4109
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
    Affects Versions: 1.1.0
            Reporter: Jark Wu
            Assignee: Jark Wu


The ternary condition operator in Table API is named {{eval}}, for example: {{(42 > 5).eval("A", "B")}} leads to "A".  IMO, the eval function is not well understood. Instead the "?" is a better choice I think, which is used in Java for condition operator. 

It will be clearer and more literal understood, e.g.

{{(42 > 5).?("A", "B")}} or {{(42 > 5) ? ("A", "B")}}

If it make sense, I will pull a request.



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