Import from JDBC with multiple statements can cause an internal error

If performing an IMPORT FROM JDBC with more than one STATEMENT and the query runtime (i.e. elapsed time before a result set is produced) of one STATEMENT is much longer (>15s) than another one, an error with the message "Internal error - A tool process exited unexpectedly" can occur.

Example:

IMPORT INTO table1 FROM JDBC AT 'jdbc:exa:<cluster>:8563' user '<user>' identified by '<pw>'
statement 'select <long-running query>'
statement 'select 1';