[GitHub] [spark] maropu commented on a change in pull request #25172: [SPARK-28412][SQL] ANSI SQL: OVERLAY function support byte array

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maropu commented on a change in pull request #25172: [SPARK-28412][SQL] ANSI SQL: OVERLAY function support byte array
URL: https://github.com/apache/spark/pull/25172#discussion_r305194211
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
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 @@ -496,19 +509,28 @@ case class Overlay(input: Expression, replace: Expression, pos: Expression, len:
     this(str, replace, pos, Literal.create(-1, IntegerType))
   }
 
-  override def dataType: DataType = StringType
+  override def dataType: DataType = input.dataType
 
   override def inputTypes: Seq[AbstractDataType] =
-    Seq(StringType, StringType, IntegerType, IntegerType)
+    Seq(input.dataType, replace.dataType, IntegerType, IntegerType)
 
 Review comment:
   Not correct here, plz use `TypeCollection(StringType, BinaryType)`.

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