Github user kevinyu98 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12646#discussion_r120217123
  
    --- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala 
---
    @@ -2658,17 +2658,17 @@ class SQLQuerySuite extends QueryTest with 
SharedSQLContext {
           sql("select LTRIM(BOTH 'S' FROM 'SS abc S')").head
         }
         assert(ae1.getMessage contains
    -      "The specified function ltrim doesn't support with option BOTH")
    +      "The specified function LTRIM doesn't support with option BOTH")
         val ae2 = intercept[ParseException]{
           sql("select RTRIM(TRAILING 'S' FROM 'SS abc S')").head
         }
         assert(ae2.getMessage contains
    -      "The specified function rtrim doesn't support with option TRAILING")
    +      "The specified function RTRIM doesn't support with option TRAILING")
         val ae3 = intercept[ParseException]{
    -      sql("select TRIM(WINDOW 'S' FROM 'SS abc S')").head
    +      sql("select TRIM(OVER 'S' AND 'SS abc S')").head
    --- End diff --
    
    I was thinking to try to use different keywords to see whether make the 
exception different. I forgot to change it back to WINDOW or remove this test 
case.


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