private void GenerateSqlForPrefixOperator (string sqlOperatorString, Expression left, Expression right)
{
_commandBuilder.Append (sqlOperatorString);
_commandBuilder.Append (" (");
_expressionVisitor.VisitExpression (left);
_commandBuilder.Append (", ");
_expressionVisitor.VisitExpression (right);
_commandBuilder.Append (")");
}