address PR comments

Author: techaddict

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

@@ -443,26 +443,24 @@ case class ArrayAggregate(
   override def prettyName: String = "aggregate"
 }
 
-/**
- * Transform elements in an array using the transform function. This is similar to
- * a `map` in functional programming.
- */
 // scalastyle:off line.size.limit
 @ExpressionDescription(
-  usage = "_FUNC_(expr, func) - Merges the two given arrays, element-wise, into a single array using function. If one array is shorter, nulls are appended at the end to match the length of the longer array, before applying function.",
+  usage = "_FUNC_(left, right, func) - Merges the two given arrays, element-wise, into a single array using function. If one array is shorter, nulls are appended at the end to match the length of the longer array, before applying function.",
   examples = """
     Examples:
-      > SELECT _FUNC_(array(1, 2, 3), x -> x + 1);
-      array(2, 3, 4)
-      > SELECT _FUNC_(array(1, 2, 3), (x, i) -> x + i);
-      array(1, 3, 5)
+      > SELECT _FUNC_(array(1, 2, 3), array('a', 'b', 'c'), (x, y) -> (y, x));
+       array(('a', 1), ('b', 3), ('c', 5))
+      > SELECT _FUNC_(array(1, 2), array(3, 4), (x, y) -> x + y));
+       array(4, 6)
+      > SELECT _FUNC_(array('a', 'b', 'c'), array('d', 'e', 'f'), (x, y) -> concat(x, y));
+       array('ad', 'be', 'cf')
   """,
   since = "2.4.0")
 // scalastyle:on line.size.limit
 case class ArraysZipWith(
-                          left: Expression,
-                          right: Expression,
-                          function: Expression)
+    left: Expression,
+    right: Expression,
+    function: Expression)
   extends HigherOrderFunction with CodegenFallback with ExpectsInputTypes {
 
   override def inputs: Seq[Expression] = List(left, right)