branch-4.0: [Feature](Iceberg) Implement publish_changes procedure for Iceberg tables #58755 #58880
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…bles (#58755) ### What problem does this PR solve? - **Issue Number**: part of #58199 - **Related PR**: N/A Problem Summary: This PR implements the `publish_changes` action for Iceberg tables. This action serves as the "Publish" step in the Write-Audit-Publish (WAP) pattern. The procedure locates a snapshot tagged with a specific `wap.id` property and cherry-picks it into the current table state. This allows users to atomically make "staged" data visible after validation. Syntax: ```sql EXECUTE TABLE catalog.db.table_name publish_changes("wap_id" = "batch_123"); ```` Output: Returns `previous_snapshot_id` (STRING) and `current_snapshot_id` (STRING) indicating the state transition. Use cases: 1. Implement Write-Audit-Publish (WAP) workflows. 2. Atomically publish validated data to the main branch. 3. Manage staged snapshots based on custom WAP IDs. Co-authored-by: Chenjunwei <[email protected]>
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Cherry-picked from #58755