[IMPALA-4605] Better handling of non-deterministic expressions in predicates

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Impala 2.5.0, Impala 2.6.0, Impala 2.7.0, Impala 2.8.0
• Component/s: Frontend
• Labels: correctness
• Target Version: Product Backlog
• Assignee: Unassigned
• Reporter: Alexander Behm
• Created: 06/Dec/16 23:49
• Updated: 06/Dec/16 23:49

Description

Predicates that contain non-deterministic expressions like rand() or uuid() can sometimes not be correctly assigned and may lead to wrong or unexpected results.

Examples:

select * from functional.alltypes where rand() > 10
select * from functional.alltypes where rand() > year
select * from functional.alltypes where rand() > int

The examples above looks similar but each provides a different set of challenges. We should decide how to handle those cases more clearly/consistently.