[DRILL-6713] Infinite loop when retrieving decimal value with scale = -1

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.14.0
• Fix Version/s: 1.15.0
• Component/s: Client - C++
• Assignee: Vova Vysotskyi
• Reporter: Rob Wu
• Created: 27/Aug/18 19:18
• Updated: 27/Sep/19 14:17
• Resolved: 05/Sep/18 18:36

Description

 

The server returns scale value of -1 for this query

select cast('999999999999999999' as decimal(18,0)) + cast('9999999999999999999999999999999999999' as decimal(38,0)) from (values(1))

 

The getValueAt() function did not take into account of the possibility of -1 scale and will go into infinite loop of appending 0 to the string buffer.

https://github.com/apache/drill/blob/1.14.0/contrib/native/client/src/include/drill/recordBatch.hpp#L752

 

This can be reproduced query submitter.

Issue Links

• is a child of: DRILL-6710 Disallow negative scale for VarDecimal