Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/14004#discussion_r69675519
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
---
@@ -198,6 +200,35 @@ case class StringSplit(str: Expression, pattern:
Expression)
override def prettyName: String = "split"
}
+/**
+ * Splits a string into arrays of sentences, where each sentence is an
array of words.
+ * The 'lang' and 'country' arguments are optional, and if omitted, the
default locale is used.
--- End diff --
Yep. It's Hive behavior. Hive supports `sentences(str)`,
`sentences(str,lang)`, and `sentences(str,lang,country)`.
And Hive does not raise exception for the illegal `lang` and `country`.
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