Till Rohrmann created FLINK-4244:
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Summary: Field names for union operator do not have to be equal
Key: FLINK-4244
URL: https://issues.apache.org/jira/browse/FLINK-4244
Project: Flink
Issue Type: Improvement
Components: Table API & SQL
Affects Versions: 1.1.0
Reporter: Till Rohrmann
Priority: Trivial
Flink Table API's documentation says that the schemas of unioned tables have to
be identical (wrt types and names). However, union works also with tables where
the types are identical but not the names:
{code}
val input1Seq = 0 until 10 map {x => (x, ('a' + x).toChar.toString, x.toDouble)}
val input2Seq = 0 until 10 map {x => (x, ('a' + x).toChar.toString,
x.toDouble)}
val inputDS1 = env.fromCollection(input1Seq)
val inputDS2 = env.fromCollection(input2Seq)
val input1 = tblEnv.fromDataSet(inputDS1, 'a, 'b, 'c)
tblEnv.registerTable("foobar", input1)
val input2 = tblEnv.fromDataSet(inputDS2, 'd, 'e, 'f)
tblEnv.registerTable("foobar2", input2)
val result = tblEnv.sql("SELECT * FROM foobar UNION ALL SELECT * FROM
foobar2")
tblEnv.toDataSet[Row](result).print()
{code}
We should update the documentation accordingly.
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