Query execution while active session limit has been reached may lead to internal server error

Detail name	Value
Changelog Number	6155
Type	Bug
Status	Resolved
Affected Versions	EXASOL 6.0.0, Exasol 7.1.0, Exasol 8.0.0
Fix Versions	Exasol 8.7.0
Resolution Date	2022-11-01

Problem Description

Due to a rare condition that can occur if a query execution is started while the active session limit has been reached, the user may get one of the following exceptions:

Successfully reconnected after connection loss, transaction was rolled back.
Successfully reconnected after internal server error, transaction was rolled back.

Expected Behavior

The incoming query should be queued until an execution slot is available, and then executed without connection loss.