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https://issues.apache.org/jira/browse/SPARK-21232?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-21232.
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Resolution: Won't Fix
Resolving this per the discussion in the JIRA
> New built-in SQL function - Data_Type
> -------------------------------------
>
> Key: SPARK-21232
> URL: https://issues.apache.org/jira/browse/SPARK-21232
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, SparkR, SQL
> Affects Versions: 2.1.1
> Reporter: Mario Molina
> Priority: Minor
>
> This function returns the data type of a given column.
> {code:java}
> data_type("a")
> // returns string
> {code}
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