[jira] [Commented] (SPARK-21804) json_tuple returns null values within repeated columns except the first one

["Jen-Ming Chung (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-21804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16136385#comment-16136385 ] 

Jen-Ming Chung commented on SPARK-21804:
----------------------------------------

I’m working on this

> json_tuple returns null values within repeated columns except the first one
> ---------------------------------------------------------------------------
>
>                 Key: SPARK-21804
>                 URL: https://issues.apache.org/jira/browse/SPARK-21804
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Jen-Ming Chung
>            Priority: Minor
>              Labels: starter
>
> I was testing json_tuple in extracting values from JSON but I found it could actually returns null values within repeated columns except the first one as below:
> {code:language=scala}
> scala> spark.sql("""SELECT json_tuple('{"a":1, "b":2}', 'a', 'b', 'a')""").show()
> +---+---+----+
> | c0| c1|  c2|
> +---+---+----+
> |  1|  2|null|
> +---+---+----+
> {code}
> I think this should be consistent with Hive's implementation:
> {code:language=scala}
> hive> SELECT json_tuple('{"a": 1, "b": 2}', 'a', 'a');
> ...
> 1    1
> {code}



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