maropu commented on a change in pull request #29161:
URL: https://github.com/apache/spark/pull/29161#discussion_r457099324
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
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@@ -412,7 +412,10 @@ case class RegExpReplace(subject: Expression, regexp:
Expression, rep: Expressio
object RegExpExtract {
def checkGroupIndex(groupCount: Int, groupIndex: Int): Unit = {
- if (groupCount < groupIndex) {
+ if (groupIndex < 0) {
+ throw new IllegalArgumentException(
+ s"The specified group index cannot be less than zero")
Review comment:
nit: remove `s` in the head.
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