Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/7546#discussion_r35125275
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -486,6 +486,10 @@ case class StringFormat(children: Expression*) extends
Expression with CodegenFa
private def format: Expression = children(0)
private def args: Seq[Expression] = children.tail
+ override def inputTypes: Seq[AbstractDataType] =
+ children.zipWithIndex.map(x => if (x._2 == 0) StringType else
AnyDataType)
--- End diff --
This works. I think `StringType :: List.fill(children.size -
1)(AnyDataType)` might be a little more clear.
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