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

    https://github.com/apache/spark/pull/12781#discussion_r61867613
  
    --- Diff: 
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
    @@ -45,7 +45,9 @@ statement
         | ALTER DATABASE identifier SET DBPROPERTIES tablePropertyList     
#setDatabaseProperties
         | DROP DATABASE (IF EXISTS)? identifier (RESTRICT | CASCADE)?      
#dropDatabase
         | createTableHeader ('(' colTypeList ')')? tableProvider
    -        (OPTIONS tablePropertyList)?                                   
#createTableUsing
    +        (OPTIONS tablePropertyList)?
    +        (PARTITIONED BY partitionColumnNames=identifierList)?
    +        bucketSpec?                                                    
#createTableUsing
    --- End diff --
    
    Yes, we do. If partition columns are empty but bucket columns are not, we 
will also use `DynamicPartitionWriterContainer`, see: 
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/InsertIntoHadoopFsRelation.scala#L124-L136


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