[jira] [Updated] (SPARK-25829) remove duplicated map keys with last wins policy

["Wenchen Fan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-25829?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan updated SPARK-25829:
--------------------------------
    Summary: remove duplicated map keys with last wins policy  (was: Duplicated map keys are not handled consistently)

> remove duplicated map keys with last wins policy
> ------------------------------------------------
>
>                 Key: SPARK-25829
>                 URL: https://issues.apache.org/jira/browse/SPARK-25829
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: Wenchen Fan
>            Assignee: Wenchen Fan
>            Priority: Major
>             Fix For: 3.0.0
>
>
> In Spark SQL, we apply "earlier entry wins" semantic to duplicated map keys. e.g.
> {code}
> scala> sql("SELECT map(1,2,1,3)[1]").show
> +------------------+
> |map(1, 2, 1, 3)[1]|
> +------------------+
> |                 2|
> +------------------+
> {code}
> However, this handling is not applied consistently.



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