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https://issues.apache.org/jira/browse/SPARK-21804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16136385#comment-16136385
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Jen-Ming Chung commented on SPARK-21804:
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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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