beliefer 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_r378297287
 
 

 ##########
 File path: sql/core/src/main/scala/org/apache/spark/sql/functions.scala
 ##########
 @@ -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:
   OK

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