[SPARK-19446] Remove unused findTightestCommonType in TypeCoercion - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Trivial
Resolution: Fixed
Affects Version/s: 2.2.0
Fix Version/s: 2.2.0
Component/s: SQL
Labels:
None

Description

It seems the codes below is not used anymore.

  /**
   * 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)
    })
  }