[IMPALA-5650] COUNT(*) optimization causes a crash when legacy aggregation is enabled

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: Impala 2.10.0
• Fix Version/s: Impala 2.10.0
• Component/s: Backend
• Epic Color: ghx-label-8
• Assignee: Taras Bobrovytsky
• Reporter: Taras Bobrovytsky
• Created: 12/Jul/17 01:30
• Updated: 14/Jul/17 02:59
• Resolved: 14/Jul/17 02:59

Description

Steps to reproduce:

1. Start Impala with the following flag: -enable_partitioned_aggregation=false
2. Run the following query:

    select count(*) from tpch_parquet.lineitem 

Impala hits a DCHECK:

aggregation-node.cc:669] Check failed: false bad aggregate operator: 6

Issue Links

• is broken by: IMPALA-5036 Improve COUNT(*) performance of Parquet scans.