[IMPALA-12857] Add flag to enable merge-on-read even if tables are configured with copy-on-write

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 4.5.0
• Component/s: Frontend
• Labels: impala-iceberg
• Epic Color: ghx-label-10
• Assignee: Noemi Pap-Takacs
• Reporter: Zoltán Borók-Nagy
• Created: 29/Feb/24 10:03
• Updated: 05/Aug/24 16:58
• Resolved: 23/Jul/24 09:25

Description

Impala can only modify a table via 'merge-on-read'. It raises an error if users want to modify a table that is configured with 'copy-on-write'.

We could add a backend flag to relax this restriction, i.e. enable 'merge-on-read' operations (DELETE, UPDATE, MERGE) even if the table property is 'copy-on-write'.