[IMPALA-967] Investigate wide table performance

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: Impala 1.3
• Component/s: Perf Investigation
• Labels: codegen
• Target Version: Product Backlog
• Assignee: Unassigned
• Reporter: Skye Wanderman-Milne
• Created: 29/Apr/14 00:23
• Updated: 16/Sep/19 22:48
• Resolved: 16/Sep/19 22:48

Description

Querying wide tables (very roughly 1000+ columns) is very slow. It looks like the time is spent in planning and/or codegen, and that the time increases worse than linearly with the number of columns.

Issue Links

• is related to: IMPALA-3091 LLVM memory is not accounted for in query mem tracker