[IMPALA-11964] Make sure Impala returns error for Iceberg tables with equality deletes

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 4.3.0
• Component/s: Frontend
• Labels: impala-iceberg
• Epic Color: ghx-label-7
• Assignee: Zoltán Borók-Nagy
• Reporter: Zoltán Borók-Nagy
• Created: 02/Mar/23 15:50
• Updated: 28/May/23 13:58
• Resolved: 28/May/23 13:58

Description

Impala only supports position deletes currently.

It should raise an error when equality deletes are encountered:

https://github.com/apache/impala/blob/eaf71bca0a3538056765dbbce13c0f503045b38b/fe/src/main/java/org/apache/impala/planner/IcebergScanPlanner.java#L344

But if we are not invoking planFiles() it's possible that Impala starts reading equality delete files as position delete files which should also raise an error. But it would be still better to catch the error during planning.

To make sure we should add tests for these scenarios.