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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4244) Field names for union operator do not have to be equal
Date Mon, 25 Jul 2016 13:44:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15391904#comment-15391904
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ASF GitHub Bot commented on FLINK-4244:
---------------------------------------

Github user twalthr commented on the issue:

    https://github.com/apache/flink/pull/2280
  
    Thanks @wuchong. Will merge...


> 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
>            Assignee: Jark Wu
>            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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