beliefer 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_r308540317
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
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@@ -458,6 +458,7 @@ case class StringReplace(srcExpr: Expression, searchExpr:
Expression, replaceExp
object Overlay {
def calculate(input: UTF8String, replace: UTF8String, pos: Int, len: Int):
UTF8String = {
+ require(pos > 0, "If you specify `pos`, it must be a positive whole
number.")
Review comment:
Yes. But I think we should supplement it.
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