Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/7468#discussion_r35071715
  
    --- Diff: 
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/StringExpressionsSuite.scala
 ---
    @@ -464,6 +464,41 @@ class StringExpressionsSuite extends SparkFunSuite 
with ExpressionEvalHelper {
         checkEvaluation(StringSpace(s1), null, row2)
       }
     
    +  test("RegexReplace") {
    +    val row1 = create_row("100-200", "(\\d+)", "num")
    --- End diff --
    
    Maybe we could add a new test suite to test expressions with mutable 
states(like this one and the Rand), focus on testing the behavior of the 
expression across multiply evaluations, and using literal here to test the 
functionality with one time evaluation.


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