Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/7546#discussion_r35063483
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -476,7 +476,7 @@ case class StringRPad(str: Expression, len: Expression,
pad: Expression)
/**
* Returns the input formatted according do printf-style format strings
*/
-case class StringFormat(children: Expression*) extends Expression with
CodegenFallback {
+case class StringFormat(children: Expression*) extends Expression {
require(children.nonEmpty, "printf() should take at least 1 argument")
--- End diff --
This should probably be an `AnalysisException`
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