Repository that support query by partition key without change interface

I've found out the solution to keep your repository independent of database(I am using v3 SDK for example). Just separated current interface into 2 parts:

public interface IRepository<T>
    Task<T> FindItemByDocumentIdAsync(string documentId);

    Task<IEnumerable<T>> FindItemsBySqlTextAsync(string sqlQuery);

    Task<IEnumerable<T>> FindAll(Expression<Func<T, bool>> predicate = null);

public interface IPartitionSetter<T>
    string PartititonKeyValue { get; }

    void SetPartitionKey<T>(string partitionKey);
}//using factory method or DI framework to create same instance for IRepository<T> and IPartitionSetter<T> in a http request


public class Repository<T> : IRepository<T>, IPartitionSetter<T>
    //other implementation

    public async Task<IEnumerable<T>> FindAll(Expression<Func<T, bool>> predicate = null)
        var result = new List<T>();
        var queryOptions = new QueryRequestOptions
            MaxConcurrency = -1,
            PartitionKey = ParsePartitionKey()

        IQueryable<T> query = _container.GetItemLinqQueryable<T>(requestOptions: queryOptions);

        if (predicate != null)
            query = query.Where(predicate);

        var setIterator = query.ToFeedIterator();
        while (setIterator.HasMoreResults)
            var executer = await setIterator.ReadNextAsync();


        return result;

    private string _partitionKey;

    public string PartititonKeyValue => _partitionKey;

    private PartitionKey? ParsePartitionKey()
        if (_partitionKey == null)
            return null;
        else if (_partitionKey == string.Empty)
            return PartitionKey.None;//for query documents with partition key is empty
            return new PartitionKey(_partitionKey);

    public void SetPartitionKey<T>(string partitionKey)
        _partitionKey = partitionKey;

You will need to inject IPartitionSetter<T> and call SetPartitionKey before execute query to apply partition key here.