cloud-fan commented on code in PR #37004:
URL: https://github.com/apache/spark/pull/37004#discussion_r908444535
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala:
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@@ -980,3 +980,41 @@ case class RegExpExtractAll(subject: Expression, regexp:
Expression, idx: Expres
newFirst: Expression, newSecond: Expression, newThird: Expression):
RegExpExtractAll =
copy(subject = newFirst, regexp = newSecond, idx = newThird)
}
+
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = """
+ _FUNC_(str, regexp) - Returns a count of the number of times that the
regular expression pattern `regexp` is matched in the string `str`.
+ """,
+ arguments = """
+ Arguments:
+ * str - a string expression.
+ * regexp - a string representing a regular expression. The regex string
should be a
+ Java regular expression.
+ """,
+ examples = """
+ Examples:
+ > SELECT _FUNC_('Steven Jones and Stephen Smith are the best players',
'Ste(v|ph)en');
+ 2
+ > SELECT _FUNC_('abcdefghijklmnopqrstuvwxyz', '[a-z]{3}');
+ 8
+ """,
+ since = "3.4.0",
+ group = "string_funcs")
+// scalastyle:on line.size.limit
+case class RegExpCount(left: Expression, right: Expression)
+ extends RuntimeReplaceable with ExpectsInputTypes {
Review Comment:
shall we extend `ImplicitCastInputTypes` so that type coercion can happen?
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