[HIVE-8078] ORC Delta encoding corrupts data when delta overflows long

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.13.1, 0.14.0
• Fix Version/s: 0.14.0
• Component/s: File Formats
• Assignee: Prasanth Jayachandran
• Reporter: Tim Patterson
• Created: 12/Sep/14 18:47
• Updated: 13/Nov/14 19:43
• Resolved: 23/Sep/14 17:53

Description

There is an issue with the integer encoding that can cause corruption in certain cases.
The following 3 longs cause this failure.
4513343538618202711
2911390882471569739
-9181829309989854913

I believe that even though the numbers are in decreasing order, the delta between the last two numbers overflows causing a positive delta, in this case the last digit ends up being corrupted (the delta is applied for the wrong sign resulting in -3442132998776557225 instead of -9181829309989854913.

Issue Links

• links to: Review Board