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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