Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22227#discussion_r212815685
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
---
@@ -232,30 +232,41 @@ case class RLike(left: Expression, right: Expression)
extends StringRegexExpress
* Splits str around pat (pattern is a regular expression).
*/
@ExpressionDescription(
- usage = "_FUNC_(str, regex) - Splits `str` around occurrences that match
`regex`.",
+ usage = "_FUNC_(str, regex, limit) - Splits `str` around occurrences
that match `regex`." +
+ "The `limit` parameter controls the number of times the pattern is
applied and " +
--- End diff --
can we be more concise? e.g. presto's doc is just
"Splits string on delimiter and returns an array of size at most limit. The
last element in the array always contain everything left in the string. limit
must be a positive number."
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