okumin commented on code in PR #5889:
URL: https://github.com/apache/hive/pull/5889#discussion_r2164415460
##########
parser/src/java/org/apache/hadoop/hive/ql/parse/AlterClauseParser.g:
##########
@@ -558,13 +558,42 @@ alterStatementSuffixReplaceTag
-> ^(TOK_ALTERTABLE_REPLACE_SNAPSHOTREF KW_TAG $sourceBranch $snapshotId
refRetain?)
;
+dropBranchStatement
+@init { gParent.pushMsg("alter table drop branch (if exists) branchName",
state); }
+@after { gParent.popMsg(state); }
+ : KW_DROP KW_BRANCH ifExists? branchName=identifier KW_FROM tableName
+ -> ^(TOK_ALTERTABLE tableName
+ ^(TOK_ALTERTABLE_DROP_BRANCH ifExists? $branchName)
+ )
Review Comment:
I heard some catalogs support DB or catalog-level branching and that's why
Trino uses `IN TABLE|SCHEMA|CATALOG identifier` instead of `FROM identifier`.
Just a tip, though Hive might not support it.
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