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https://issues.apache.org/jira/browse/SPARK-25829?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan updated SPARK-25829:
Description:
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.
was:
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 consistenly.
> Duplicated map keys are not handled consistently
>
>
> 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
>Priority: Major
>
> 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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