[jira] [Commented] (SPARK-18736) CreateMap allows non-unique keys

["Shuai Lin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-18736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15725579#comment-15725579 ] 

Shuai Lin commented on SPARK-18736:
-----------------------------------

I can work on this.

> CreateMap allows non-unique keys
> --------------------------------
>
>                 Key: SPARK-18736
>                 URL: https://issues.apache.org/jira/browse/SPARK-18736
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.0
>            Reporter: Eyal Farago
>              Labels: map, sql, types
>
> Spark-Sql, {{CreateMap}} does not enforce unique keys, i.e. it's possible to create a map with two identical keys: 
> {noformat}
> CreateMap(Literal(1), Literal(11), Literal(1), Literal(12))
> {noformat}
> This does not behave like standard maps in common programming languages.
> proper behavior should be chosen:
> # first 'wins'
> # last 'wins'
> # runtime error.
> {{GetMapValue}} currently implements option #1. Even if this is the desired behavior {{CreateMap}} should return a unique map.



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