Fix provider constructors

Author: AlexUstinov

Orm/Xtensive.Orm/Orm/Rse/Providers/Compilable/IncludeProvider.cs

@@ -93,7 +93,19 @@ public IncludeProvider(CompilableProvider source, IncludeAlgorithm algorithm, bo
       IsInlined = isInlined;
       FilterDataSource = filterDataSource;
       ResultColumnName = resultColumnName;
-      FilteredColumns = filteredColumns is int[] columns ? Array.AsReadOnly(columns) : filteredColumns;
+
+      switch (filteredColumns) {
+        case int[] columnArray:
+          FilteredColumns = Array.AsReadOnly(columnArray);
+          break;
+        case List<int> columnList:
+          FilteredColumns = columnList.AsReadOnly();
+          break;
+        default:
+          FilteredColumns = filteredColumns;
+          break;
+      }
+
       Initialize();
     }
   }

Orm/Xtensive.Orm/Orm/Rse/Providers/Compilable/SelectProvider.cs

@@ -38,23 +38,24 @@ protected override string ParametersToString()
 
     // Constructors
 
-    /// <summary>
-    ///   Initializes a new instance of this class.
-    /// </summary>
-    public SelectProvider(CompilableProvider provider, int[] columnIndexes)
-      : base(ProviderType.Select, provider)
-    {
-      this.ColumnIndexes = Array.AsReadOnly(columnIndexes);
-      Initialize();
-    }
-
     /// <summary>
     ///   Initializes a new instance of this class.
     /// </summary>
     public SelectProvider(CompilableProvider provider, IReadOnlyList<int> columnIndexes)
       : base(ProviderType.Select, provider)
     {
-      this.ColumnIndexes = columnIndexes is int[] indexes  ? indexes : columnIndexes;
+      switch (columnIndexes) {
+        case int[] indexArray:
+          ColumnIndexes = Array.AsReadOnly(indexArray);
+          break;
+        case List<int> indexList:
+          ColumnIndexes = indexList.AsReadOnly();
+          break;
+        default:
+          ColumnIndexes = columnIndexes;
+          break;
+      }
+
       Initialize();
     }
   }