[IMPALA-9126] Cleanly separate build and probe state in hash join node

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 3.4.0
• Component/s: Backend
• Labels: multithreading
• Epic Link: Impala Multi-threaded query execution
• Target Version: Product Backlog
• Epic Color: ghx-label-3
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 05/Nov/19 19:40
• Updated: 06/Dec/19 03:16
• Resolved: 06/Dec/19 03:16

Description

As a precursor to IMPALA-4224, we should clean up the hash join implementation so that the build and probe state is better separated. The builder should not deal with probe side data structures (like the probe streams that it allocates) and all accesses to the build-side data structures should go through as narrow APIs as possible.

The nested loop join is already pretty clean.

Issue Links

• is depended upon by: IMPALA-4224 Add backend support for join build sinks in parallel plans