[IMPALA-5722] Converting a string decimal with a large negative exponent causes a crash

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: Impala 2.10.0
• Component/s: Backend
• Epic Color: ghx-label-1
• Assignee: Taras Bobrovytsky
• Reporter: Taras Bobrovytsky
• Created: 26/Jul/17 03:23
• Updated: 31/Jul/17 22:04
• Resolved: 31/Jul/17 22:04

Description

The following query causes a crash:

select cast("1.234e-30" as decimal(10, 2))

We hit a DCHECK:

string-parser.h:221] Check failed: value >= 0

One a release build, the result is incorrect:

+------------------------------------+
| cast('1.234e-30' as decimal(10,2)) |
+------------------------------------+
| -12.34                             |
+------------------------------------+