hililiwei commented on code in PR #6617:
URL: https://github.com/apache/iceberg/pull/6617#discussion_r1080806243
##########
spark/v3.3/spark-extensions/src/main/antlr/org.apache.spark.sql.catalyst.parser.extensions/IcebergSqlExtensions.g4:
##########
@@ -73,6 +73,13 @@ statement
| ALTER TABLE multipartIdentifier WRITE writeSpec
#setWriteDistributionAndOrdering
| ALTER TABLE multipartIdentifier SET IDENTIFIER_KW FIELDS fieldList
#setIdentifierFields
| ALTER TABLE multipartIdentifier DROP IDENTIFIER_KW FIELDS fieldList
#dropIdentifierFields
+ | ALTER TABLE multipartIdentifier CREATE BRANCH identifier (AS OF VERSION
snapshotId)? (snapshotRetentionClause)? (RETAIN snapshotRefRetain
snapshotRefRetainTimeUnit)? #createBranch
Review Comment:
Sounds reasonable to me.
##########
spark/v3.3/spark-extensions/src/main/antlr/org.apache.spark.sql.catalyst.parser.extensions/IcebergSqlExtensions.g4:
##########
@@ -73,6 +73,13 @@ statement
| ALTER TABLE multipartIdentifier WRITE writeSpec
#setWriteDistributionAndOrdering
| ALTER TABLE multipartIdentifier SET IDENTIFIER_KW FIELDS fieldList
#setIdentifierFields
| ALTER TABLE multipartIdentifier DROP IDENTIFIER_KW FIELDS fieldList
#dropIdentifierFields
+ | ALTER TABLE multipartIdentifier CREATE BRANCH identifier (AS OF VERSION
snapshotId)? (snapshotRetentionClause)? (RETAIN snapshotRefRetain
snapshotRefRetainTimeUnit)? #createBranch
+ ;
+
+snapshotRetentionClause
+ : WITH SNAPSHOT RETENTION numSnapshots SNAPSHOTS
+ | WITH SNAPSHOT RETENTION snapshotRetain snapshotRetainTimeUnit
+ | WITH SNAPSHOT RETENTION numSnapshots SNAPSHOTS snapshotRetain
snapshotRetainTimeUnit
Review Comment:
This skips illegal statements : `WITH SNAPSHOT RETENTION`
or we can use
`WITH SNAPSHOT RETENTION ((numSnapshots SNAPSHOTS)? (snapshotRetain
snapshotRetainTimeUnit)? | numSnapshots SNAPSHOTS snapshotRetain
snapshotRetainTimeUnit )`?
But it's not intuitive
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