server/AyaNova/DataList/DataListFieldDefinition.cs

@@ -53,6 +53,9 @@ namespace AyaNova.DataList
         [JsonIgnore]
         public string SqlColorColumnName { get; set; }//column to fetch the color if applicable to this field
 
+        [JsonIgnore]
+        public string SqlColumnExpression { get; set; }//column is based on this expression, not directly on the source tables
+
         public DataListFieldDefinition()
         {
             //most common defaults           
@@ -65,6 +68,7 @@ namespace AyaNova.DataList
             AType = (int)AyaType.NoType;
             SqlATypeColumnName = null;//must be null as that is checked against specifically
             SqlColorColumnName = null;//must be  null to be ignored properly
+            SqlColumnExpression = null;
         }
 
         //Get column to query for display name or use FieldName if there is no difference