[jira] [Created] (FLINK-20506) Support FlatMap Operation in Python Table API

[Huang Xingbo (Jira)]

Huang Xingbo created FLINK-20506:
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             Summary: Support FlatMap Operation in Python Table API
                 Key: FLINK-20506
                 URL: https://issues.apache.org/jira/browse/FLINK-20506
             Project: Flink
          Issue Type: Sub-task
          Components: API / Python
            Reporter: Huang Xingbo
             Fix For: 1.13.0


Support Python UDTF for FlatMap Operation in Python Table API

The usage:
{code}
t = ...  # type: Table, table schema: [a: String, b: Int, c: Int]

# map General Python UDF
flat_map_func = udtf(lambda x: for i in range(x): yield Row(i + 1, i * i), 
           result_types=[DataTypes.INT(), DataTypes.INT()]
t.flat_map(flat_map_func(t.b)).alias("a", "b"){code}



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