beliefer commented on a change in pull request #29161:
URL: https://github.com/apache/spark/pull/29161#discussion_r457792887
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
##########
@@ -426,6 +428,14 @@ object RegExpExtract {
*/
@ExpressionDescription(
usage = "_FUNC_(str, regexp[, idx]) - Extracts a group that matches
`regexp`.",
+ arguments = """
+ Arguments:
+ * str - a string expression.
+ * regexp - a string expression. a string representing a regular
expression.
+ The regex string should be a Java regular expression.
+ * idx - a int expression that representing the group index. The group
index should be
+ 0 or positive. If `idx` is not specified, the default group index
value is 1.
Review comment:
OK.
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