Github user hvanhovell commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18540#discussion_r129005233
  
    --- Diff: 
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/parser/ExpressionParserSuite.scala
 ---
    @@ -267,16 +267,17 @@ class ExpressionParserSuite extends PlanTest {
         // Range/Row
         val frameTypes = Seq(("rows", RowFrame), ("range", RangeFrame))
         val boundaries = Seq(
    -      ("10 preceding", ValuePreceding(10), CurrentRow),
    -      ("3 + 1 following", ValueFollowing(4), CurrentRow), // Will fail 
during analysis
    -      ("unbounded preceding", UnboundedPreceding, CurrentRow),
    -      ("unbounded following", UnboundedFollowing, CurrentRow), // Will 
fail during analysis
    -      ("between unbounded preceding and current row", UnboundedPreceding, 
CurrentRow),
    +      ("10 preceding", -Literal(10), CurrentRow),
    +      ("2147483648 preceding", -Literal(2147483648L), CurrentRow),
    +      ("3 + 1 following", Add(Literal(3), Literal(1)), CurrentRow), // 
Will fail during analysis
    --- End diff --
    
    Do you think that will improve the UX?


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