[QUESTION] Predicate Order matter ?

I wonder if the order is matter when querying the database ? The results of the following two queries are different, can someone explain that to me,

LiteDB version: master branch

void Main()
{
	var cs = new ConnectionString
	{
		Filename = @"c:\mydb.db",
		Password = @"MyP@55w0rd"
	};

	using (var db = new LiteDatabase(cs))
	{
		var col = db.GetCollection<Product>("Prods");
		col.DeleteAll();
		
		#region
		col.Insert(new Product { Id = 4, Name = "Vantage" });
		col.Insert(new Product { Id = 5, Name = "Corvette" });
		col.Insert(new Product { Id = 7, Name = "Caprice" });
		col.Insert(new Product { Id = 6, Name = "3000GT" });
		#endregion
		
		col.EnsureIndex(c => c.Name);
		
		Expression<Func<Product, bool>> p1 = p=>false; 
		Expression<Func<Product, bool>> p2 = p=>p.Name.Contains("a");
		
		//1 query
		col
		.Query()
		.Where(p2.Or(p1))
		.Count();//<== cout == 2
		
		//2 query
		col
		.Query()
		.Where(p1.Or(p2))
		.Count();//<== cout == 0
	}
}
// Define other methods, classes and namespaces here
public class Product
{
	public int Id{get;set;}
	public string Name{get;set;}
}

Thank you in advance

_Originally posted by @toumir in https://github.com/mbdavid/LiteDB/issues/1824#issuecomment-697361182_

[AlBannaTechno]

this workaround worked for me

 public IList<Expression<Func<Product, bool>>> GetListPredicates()
{
var lstExpr = new List<Expression<Func<Product,bool>>> {p => p.IsChrgDechrg};
if(condition)
{
	lstExpr.Add(p => p.IsSynch);
}
if(condition2)
{
	lstExpr.Add(p => p.Name.Constains("a"));
}
....
 return lstExpr;
}

usage

var queryable = Context.GetCollection<T>().Query();
foreach (var p in GetListPredicates())
{
    queryable.Where(p);
 });			
queryable.ToList();

@toumir

I Used similar solution for a long time and its is work perfectly, But we still need to fix the bug in the library.

So i wait, @lbnascimento, and i will try to solve it.

[toumir]

@AlBannaTechno maybe @lbnascimento answer you 😃