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

    https://github.com/apache/spark/pull/3926#discussion_r23334238
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/AbstractSparkSQLParser.scala
 ---
    @@ -25,15 +25,42 @@ import scala.util.parsing.input.CharArrayReader.EofCh
     
     import org.apache.spark.sql.catalyst.plans.logical._
     
    +private[sql] object KeywordNormalizer {
    --- End diff --
    
    This is kind of a nit, but since this is only used in 
AbstractSparkSQLParser and its subclasses I'd just make it a protected method 
to avoid the syntatic overhead of a whole separate object.  I believe you are 
doing further refactoring so maybe that can be done in a followup.


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