Github user phegstrom commented on a diff in the pull request:
https://github.com/apache/spark/pull/22227#discussion_r213844148
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
---
@@ -229,33 +229,59 @@ case class RLike(left: Expression, right: Expression)
extends StringRegexExpress
/**
- * Splits str around pat (pattern is a regular expression).
+ * Splits str around pattern (pattern is a regular expression).
--- End diff --
going to switch to `regex`, makes more sense given that with the use of
`pattern` we always have to define it as a regex
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