[jira] [Created] (FLINK-10973) Add Map operator to Table API

[sunjincheng (JIRA)]

sunjincheng created FLINK-10973:
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             Summary: Add Map operator to Table API
                 Key: FLINK-10973
                 URL: https://issues.apache.org/jira/browse/FLINK-10973
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
    Affects Versions: 1.8.0
            Reporter: sunjincheng


Add Map operator to Table API as described in [Google 
doc|https://docs.google.com/document/d/1tnpxg31EQz2-MEzSotwFzqatsB4rNLz0I-l_vPa5H4Q/edit#heading=h.q23rny2iglsr]

The usage：
{code:java}
val res = tab
   .map(fun: ScalarFunction)  // output has columns 'a, 'b, 'c
   .select('a, 'c)
{code}



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