Implement missing GetColumnCapability in CdpDelegationInfo (#2698)

src/libraries/Microsoft.PowerFx.Connectors/Public/CdpDelegationInfo.cs

@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 
+using System;
+
 namespace Microsoft.PowerFx.Core.Entities
 {
     // Used by ServiceCapabilities.ToDelegationInfo for managing CDP x-ms-capabilities
@@ -8,8 +10,16 @@ namespace Microsoft.PowerFx.Core.Entities
     {
         public override ColumnCapabilitiesDefinition GetColumnCapability(string fieldName)
         {
-            // We should never reach that point in CDP case
-            throw new System.NotImplementedException();
+            if (ColumnsCapabilities.TryGetValue(fieldName, out ColumnCapabilitiesBase columnCapabilitiesBase))
+            {               
+                return columnCapabilitiesBase switch
+                {
+                    ColumnCapabilities columnCapabilities => columnCapabilities.Definition,
+                    _ => throw new NotImplementedException($"{columnCapabilitiesBase.GetType().Name} not supported yet")
+                };
+            }
+
+            return null;
         }
     }
 }

src/libraries/Microsoft.PowerFx.Core/Entities/External/TableDelegationInfo.cs

@@ -34,7 +34,7 @@ namespace Microsoft.PowerFx.Core.Entities
         internal PagingCapabilities PagingCapabilities { get; init; }
 
         // Defining per column capabilities
-        internal IReadOnlyCollection<KeyValuePair<string, ColumnCapabilitiesBase>> ColumnsCapabilities { get; init; }
+        internal IReadOnlyDictionary<string, ColumnCapabilitiesBase> ColumnsCapabilities { get; init; }
 
         // Supports per record permission
         internal bool SupportsRecordPermission { get; init; }
@@ -94,6 +94,8 @@ namespace Microsoft.PowerFx.Core.Entities
 
         private ColumnCapabilitiesDefinition _capabilities;
 
+        public ColumnCapabilitiesDefinition Definition => _capabilities;
+
         // Those are default CDS filter supported functions 
         // From // PowerApps-Client\src\Language\PowerFx.Dataverse.Parser\Importers\DataDescription\CdsCapabilities.cs
         public static readonly IEnumerable<DelegationOperator> DefaultFilterFunctionSupport = new DelegationOperator[]