add order by

src/Infrastructure/BotSharp.Abstraction/VectorStorage/Models/VectorFilter.cs

@@ -9,11 +9,20 @@ public class VectorFilter : StringIdPagination
     /// Filter group: each item contains a logical operator and a list of key-value pairs
     /// </summary>
     [JsonPropertyName("filter_groups")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
     public IEnumerable<VectorFilterGroup>? FilterGroups { get; set; }
 
+    /// <summary>
+    /// Order by a specific field
+    /// </summary>
+    [JsonPropertyName("order_by")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public VectorSort? OrderBy { get; set; }
+
     /// <summary>
     /// Included payload fields
     /// </summary>
     [JsonPropertyName("fields")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
     public IEnumerable<string>? Fields { get; set; }
 }

src/Infrastructure/BotSharp.Abstraction/VectorStorage/Models/VectorSort.cs

@@ -0,0 +1,10 @@
+namespace BotSharp.Abstraction.VectorStorage.Models;
+
+public class VectorSort
+{
+    [JsonPropertyName("field")]
+    public string? Field { get; set; }
+
+    [JsonPropertyName("order")]
+    public string? Order { get; set; } = "desc";
+}

src/Plugins/BotSharp.Plugin.Qdrant/QdrantDb.cs

@@ -144,6 +144,7 @@ public class QdrantDb : IVectorDb
 
         Filter? queryFilter = BuildQueryFilter(filter.FilterGroups);
         WithPayloadSelector? payloadSelector = BuildPayloadSelector(filter.Fields);
+        OrderBy? orderBy = BuildOrderBy(filter.OrderBy);
 
         var client = GetClient();
         var tasks = new List<Task>();
@@ -154,6 +155,7 @@ public class QdrantDb : IVectorDb
             limit: (uint)filter.Size,
             offset: !string.IsNullOrWhiteSpace(filter.StartId) ? new PointId { Uuid = filter.StartId } : null,
             filter: queryFilter,
+            orderBy: orderBy,
             payloadSelector: payloadSelector,
             vectorsSelector: filter.WithVector);
 
@@ -371,7 +373,13 @@ public class QdrantDb : IVectorDb
 
         var client = GetClient();
         var schemaType = ConvertPayloadSchemaType(options.FieldSchemaType);
-        var result = await client.CreatePayloadIndexAsync(collectionName, options.FieldName, schemaType);
+        var result = await client.CreatePayloadIndexAsync(collectionName, options.FieldName, schemaType, indexParams: new()
+        {
+            IntegerIndexParams = new()
+            {
+                Range = true
+            }
+        });
         return result.Status == UpdateStatus.Completed;
     }
 
@@ -618,6 +626,20 @@ public class QdrantDb : IVectorDb
         return payloadSelector;
     }
 
+    private OrderBy? BuildOrderBy(VectorSort? sort)
+    {
+        if (string.IsNullOrWhiteSpace(sort?.Field))
+        {
+            return null;
+        }
+
+        return new OrderBy
+        {
+            Key = sort.Field,
+            Direction = sort.Order == "asc" ? Direction.Asc : Direction.Desc
+        };
+    }
+
     private PayloadSchemaType ConvertPayloadSchemaType(string schemaType)
     {
         PayloadSchemaType res;