Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12853#discussion_r61958841
  
    --- Diff: 
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
    @@ -81,18 +81,8 @@ statement
             DROP (IF EXISTS)? partitionSpec (',' partitionSpec)* PURGE?    
#dropTablePartitions
         | ALTER VIEW tableIdentifier
             DROP (IF EXISTS)? partitionSpec (',' partitionSpec)*           
#dropTablePartitions
    -    | ALTER TABLE tableIdentifier partitionSpec?
    -        SET FILEFORMAT fileFormat                                      
#setTableFileFormat
         | ALTER TABLE tableIdentifier partitionSpec? SET locationSpec      
#setTableLocation
    -    | ALTER TABLE tableIdentifier partitionSpec?
    -        CHANGE COLUMN? oldName=identifier colType
    -        (FIRST | AFTER after=identifier)? (CASCADE | RESTRICT)?        
#changeColumn
    --- End diff --
    
    thanks


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