[IMPALA-12510] ProcessingCost.getNumInstanceMax() should not return 0.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 4.3.0
• Fix Version/s: Impala 4.4.0
• Component/s: Frontend
• Epic Color: ghx-label-9
• Assignee: Riza Suminto
• Reporter: Riza Suminto
• Created: 20/Oct/23 18:41
• Updated: 02/Nov/23 00:11
• Resolved: 02/Nov/23 00:11

Description

ProcessingCost.getNumInstanceMax() is used for calculating cost-based max parallelism. It should return 1 at minimum, not 0.

https://github.com/apache/impala/blob/b15d6dc2e7df05392a1daa4bc1b3da9ca31a583b/fe/src/main/java/org/apache/impala/planner/ProcessingCost.java#L207-L211