cloud-fan commented on a change in pull request #27507: [SPARK-24884][SQL]
Support regexp function regexp_extract_all
URL: https://github.com/apache/spark/pull/27507#discussion_r378292496
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File path: sql/core/src/main/scala/org/apache/spark/sql/functions.scala
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@@ -2383,6 +2383,17 @@ object functions {
RegExpExtract(e.expr, lit(exp).expr, lit(groupIdx).expr)
}
+ /**
+ * Extract all specific group matched by a Java regex, from the specified
string column.
+ * If the regex did not match, or the specified group did not match, an
empty array is returned.
Review comment:
let's document the behavior clearly.
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