public class CustomSQLServerPlatform extends SQLServerPlatform {
    private static final long serialVersionUID = 1L;
    
    @Override
    protected void initializePlatformOperators() {
        super.initializePlatformOperators();
        
        overwriteToNumberOperator();
    }

    protected void overwriteToNumberOperator() {
        final ExpressionOperator operator = new ExpressionOperator();
        operator.setSelector(ExpressionOperator.ToNumber);
        final Vector v = org.eclipse.persistence.internal.helper.NonSynchronizedVector.newInstance(2);
        v.addElement("CONVERT(DECIMAL(10,8),");
        v.addElement(")");
        operator.printsAs(v);
        operator.bePrefix();
        operator.setNodeClass(FunctionExpression.class);
        
        addOperator(operator);
    }
    
}