To support WAP workflows, Presto should support the deletion of branches and tags. These are metadata-only operations which can be accomplished through a new ALTER TABLE syntax.

Part of #22025

Expected Behavior or Use Case

ALTER TABLE iceberg.default.mytable DROP BRANCH 'audit-branch'

ALTER TABLE iceberg.default.mytable DROP TAG 'audit-tag'

Presto Component, Service, or Connector

Iceberg connector, with additional syntax support from the parser, and additional connector functionality to support branching and tagging. Only Iceberg will initially have this support.

Possible Implementation

Example Screenshots (if appropriate):

Context