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https://issues.apache.org/jira/browse/SPARK-25522?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-25522:
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Assignee: Dilip Biswal (was: Apache Spark)
> Improve type promotion for input arguments of elementAt function
> -----------------------------------------------------------------
>
> Key: SPARK-25522
> URL: https://issues.apache.org/jira/browse/SPARK-25522
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Dilip Biswal
> Assignee: Dilip Biswal
> Priority: Major
> Fix For: 2.4.0
>
>
> In ElementAt, when first argument is MapType, we should coerce the key type
> and the second argument based on findTightestCommonType. This is not
> happening currently.
> Also, when the first argument is ArrayType, the second argument should be an
> integer type or a smaller integral type that can be safely casted to an
> integer type. Currently we may do an unsafe cast.
> {code:java}
> spark-sql> select element_at(array(1,2), 1.24);
> 1{code}
> {code:java}
> spark-sql> select element_at(map(1,"one", 2, "two"), 2.2);
> two{code}
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