Connector can crash, if one of queires in the batch returns error on result storing

For example, this batch

"SELECT 1; SELECT(SELECT ENGINE FROM INFORMATION_SCHEMA.ENGINES)"

will do this.

This happens, because 2nd query prepares and executes without an error, the error occurs only on the stage of the storing of the result(because sub-query returns more than one row), and that case is not processed in the connector in case of batch of queries.