hililiwei opened a new pull request, #6617:
URL: https://github.com/apache/iceberg/pull/6617

   ## What is the purpose of the change
   Implement the syntax in the following documents:
   
https://docs.google.com/document/d/1tbATFPrKF3vNlzkgZQdaW8CAJmbjvryfrlg6C2Ci_aA/edit
   
   Further split ref DDL into smaller PR.
   
   ### DDLs for Branch and Retention 
   
   #### Create  Branches
   ```sql
   ALTER TABLE tableName
   {CREATE | REPLACE} BRANCH branchName [AS OF {VERSION snapshotId}]
   [WITH SNAPSHOT RETENTION {[num_snapshots SNAPSHOTS]
   [interval {MONTHS | DAYS | HOURS | MINUTES}]}]}]
   [RETAIN interval {MONTHS | DAYS | HOURS | MINUTES}]
   
   ALTER TABLE prod.db.my_table 
   CREATE BRANCH test_branch AS OF VERSION 100 WITH SNAPSHOT RETENTION 5
   SNAPSHOTS 7 DAYS
   RETAIN 12 MONTHS
   
   ```
   
   cc @jackye1995 @amogh-jahagirdar 


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