[SPARK-9154][SQL] build fix

Author: tarekbecker

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala

@@ -487,7 +487,7 @@ case class StringFormat(children: Expression*) extends Expression with ImplicitC
   private def args: Seq[Expression] = children.tail
 
   override def inputTypes: Seq[AbstractDataType] =
-    children.zipWithIndex.map(x => if (x._2 == 0) StringType else AnyDataType)
+    StringType :: List.fill(children.size - 1)(AnyDataType)
 
 
   override def eval(input: InternalRow): Any = {

sql/core/src/test/scala/org/apache/spark/sql/StringFunctionsSuite.scala

@@ -120,16 +120,6 @@ class StringFunctionsSuite extends QueryTest {
     checkAnswer(
       df.selectExpr("printf(a, b, c)"),
       Row("aa123cc"))
-
-    val df2 = Seq(("aa%d%s".getBytes, 123, "cc")).toDF("a", "b", "c")
-
-    checkAnswer(
-      df2.select(formatString($"a", $"b", $"c"), formatString("aa%d%s", "b", "c")),
-      Row("aa123cc", "aa123cc"))
-
-    checkAnswer(
-      df2.selectExpr("printf(a, b, c)"),
-      Row("aa123cc"))
   }
 
   test("string instr function") {