HuangXingBo commented on a change in pull request #14317:
URL: https://github.com/apache/flink/pull/14317#discussion_r539046967
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File path: flink-python/pyflink/table/table.py
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@@ -759,6 +759,27 @@ def drop_columns(self, *fields: Union[str, Expression]) ->
'Table':
assert isinstance(fields[0], str)
return Table(self._j_table.dropColumns(fields[0]), self._t_env)
+ def map(self, func: Union[str, Expression]) -> 'Table':
+ """
+ Performs a map operation with an user-defined scalar function.
+
+ Example:
+ ::
+
+ >>> add = udf(lambda x: Row(x + 1, x *x),
result_type=DataTypes.Row(
+ ... [DataTypes.FIELD("a", DataTypes.INT()), DataTypes.FIELD("b",
DataTypes.INT())]))
+ >>> table_env.create_temporary_function("add", add)
+ >>> tab.map(add(tab.a)).alias("a, b")
+ >>> tab.map("add(a)").alias("a, b")
Review comment:
Yes. Make sense.
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