Possible crash in virtual schema when using IMPORT FROM EXA in pushdown

Detail name	Value
Changelog Number	10147
Type	Bug
Status	Resolved
Affected Versions	Exasol 6.2.4, Exasol 6.1.9, Exasol 6.2.5, Exasol 7.0.beta1, Exasol 7.0.alpha2
Fix Versions	Exasol 7.0.0, Exasol 6.1.10, Exasol 6.2.8
Resolution Date	2020-06-24

Problem Description

In rare circumstances, a virtual schema pushdown request may crash, causing the SQL session to reconnect.
This problem will only occur, when the pushdown result of the virtual schema adapter includes IMPORT FROM EXA.

Fix

The pushdown request no longer crashes in this rare cornercase

Workaround

If possible, replace the IMPORT FROM EXA with IMPORT FROM JDBC.
This workaround will degrade performance, so it should be removed after this problem is fixed in Exasol.