[IMPALA-3631] Investigate why Decimal to Timestamp casting became slower

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Later
• Affects Version/s: Impala 2.6.0
• Component/s: Backend
• Labels: performance
• Target Version: Product Backlog
• Assignee: Unassigned
• Reporter: Taras Bobrovytsky
• Created: 27/May/16 01:51
• Updated: 01/Feb/19 15:44
• Resolved: 01/Feb/19 15:44

Description

https://issues.cloudera.org/browse/IMPALA-3163 fixes the correctness issue with Decimal to Timestamp casting, but worsens the performance by about 30%. We want to understand why this happens and possibly fix it.