[IMPALA-4578] Inferred predicates not assigned to Kudu scan nodes.

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: Impala 2.8.0
• Fix Version/s: Impala 2.8.0
• Component/s: Frontend
• Labels: performance
• Target Version: Impala 2.8.0
• Assignee: Alexander Behm
• Reporter: Alexander Behm
• Created: 02/Dec/16 21:11
• Updated: 06/Dec/16 15:40
• Resolved: 06/Dec/16 15:40

Description

Predicates inferred based on slot equivalences are not assigned to Kudu scan nodes. This is a simple oversight in the code of KuduScanNode.init(). We should generate inferred predicates by also calling Analyzer.getBoundPredicates().

Example:

select count(*) from functional_kudu.alltypes a
join functional_kudu.alltypes b
on a.id = b.id
where a.int_col < 10

In the example above we can generate 'b.int_col < 10' and assign it to the scan of b.