zhangbutao commented on code in PR #5028:
URL: https://github.com/apache/hive/pull/5028#discussion_r1470579963


##########
parser/src/java/org/apache/hadoop/hive/ql/parse/AlterClauseParser.g:
##########
@@ -99,6 +100,19 @@ alterTblPartitionStatementSuffix[boolean partition]
   | alterStatementSuffixAddCol
   | alterStatementSuffixUpdateColumns
   ;
+    
+optimizeTableStatementSuffix

Review Comment:
   We already have `alter table execute` syntax for partial iceberg maintance 
operations:
   
https://github.com/apache/hive/blob/94f318959ca6ec5f815e6326241bd2269ce91b80/parser/src/java/org/apache/hadoop/hive/ql/parse/AlterClauseParser.g#L473
   
   How do we distinguish between the two syntax? 
   Is the `optimize` only used for iceberg compaction?
   
   I'm not opposed to adding new syntax, but i think we need to clarify the 
specific use cases to avoid users confusion.
   
   cc @ayushtkn @deniskuzZ any thoughts?



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