rdblue commented on a change in pull request #2365:
URL: https://github.com/apache/iceberg/pull/2365#discussion_r601743256



##########
File path: 
spark3-extensions/src/main/antlr/org.apache.spark.sql.catalyst.parser.extensions/IcebergSqlExtensions.g4
##########
@@ -69,6 +69,7 @@ statement
     : CALL multipartIdentifier '(' (callArgument (',' callArgument)*)? ')'     
             #call
     | ALTER TABLE multipartIdentifier ADD PARTITION FIELD transform (AS 
name=identifier)?   #addPartitionField
     | ALTER TABLE multipartIdentifier DROP PARTITION FIELD transform           
             #dropPartitionField
+    | ALTER TABLE multipartIdentifier REPLACE PARTITION FIELD transform TO 
transform (AS name=identifier)? #replacePartitionField

Review comment:
       Also, why support `AS`? Shouldn't the new partition field use the same 
name as the old partition field?
   
   I would also expect using a partition field name to work. So if I used 
`bucket(16, id) AS shard` to create the partition, then I should also be able 
to use `REPLACE shard WITH bucket(32, id)`.




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