zhangbutao commented on code in PR #4216:
URL: https://github.com/apache/hive/pull/4216#discussion_r1183485755
##########
parser/src/java/org/apache/hadoop/hive/ql/parse/AlterClauseParser.g:
##########
@@ -477,6 +478,34 @@ alterStatementSuffixExecute
-> ^(TOK_ALTERTABLE_EXECUTE KW_SET_CURRENT_SNAPSHOT $snapshotParam)
;
+alterStatementSuffixCreateBranch
+@init { gParent.pushMsg("alter table create branch", state); }
+@after { gParent.popMsg(state); }
+ : KW_CREATE KW_BRANCH branchName=identifier snapshotIdOfBranch?
branchRetain? retentionOfSnapshots?
+ -> ^(TOK_ALTERTABLE_CREATE_BRANCH $branchName snapshotIdOfBranch?
branchRetain? retentionOfSnapshots?)
+ ;
+
+snapshotIdOfBranch
+@init { gParent.pushMsg("alter table create branch as of version", state); }
Review Comment:
My original thought was to be consistent with spark-iceberg syntax. But it
seems more reasonable to be sync with current hive` timet_travel` syntax.
I will be change the syntax and add the syntax `FOR SYSTEM_TIME AS OF`.
The new syntax will be as follows:
```
ALTER TABLE tableName
{CREATE BRANCH branchName [FOR SYSTEM_VERSION AS OF {snapshotId} | FOR
SYSTEM_TIME AS OF {timestamp}]
[RETAIN interval {DAYS | HOURS | MINUTES}]
[WITH SNAPSHOT RETENTION {[num_snapshots SNAPSHOTS] [interval {DAYS | HOURS
| MINUTES}]}]}]
```
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