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https://issues.apache.org/jira/browse/SPARK-19446?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-19446.
-----------------------------
Resolution: Fixed
Fix Version/s: 2.2.0
Issue resolved by pull request 16786
[https://github.com/apache/spark/pull/16786]
> Remove unused findTightestCommonType in TypeCoercion
> ----------------------------------------------------
>
> Key: SPARK-19446
> URL: https://issues.apache.org/jira/browse/SPARK-19446
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Hyukjin Kwon
> Priority: Trivial
> Fix For: 2.2.0
>
>
> It seems the codes below is not used anymore.
> {code}
> /**
> * Find the tightest common type of a set of types by continuously applying
> * `findTightestCommonTypeOfTwo` on these types.
> */
> private def findTightestCommonType(types: Seq[DataType]): Option[DataType]
> = {
> types.foldLeft[Option[DataType]](Some(NullType))((r, c) => r match {
> case None => None
> case Some(d) => findTightestCommonTypeOfTwo(d, c)
> })
> }
> {code}
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