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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 03:59:18 UTC
[jira] [Updated] (SPARK-18736) CreateMap allows non-unique keys
[ https://issues.apache.org/jira/browse/SPARK-18736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon updated SPARK-18736:
---------------------------------
Labels: bulk-closed map sql types (was: map sql types)
> 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
> Priority: Major
> Labels: bulk-closed, 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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