Support special characters in external att names in CosmosDB (#837)

Author: sjuarezgx

dotnet/src/dotnetcore/DynService/Cosmos/CosmosDBConnection.cs

@@ -461,9 +461,13 @@ private void CreateCosmosQuery(CosmosDBQuery query,ServiceCursorDef cursorDef, I
 			IEnumerable<string> projection = query.Projection;
 			string element;
 			string projectionList = string.Empty;
+			string regexSpecialChars = "[^A-Za-z0-9]";
 			foreach (string key in projection)
 			{
-				element = $"{TABLE_ALIAS}.{key}";
+				if (Regex.IsMatch(key, regexSpecialChars))
+					element = $"{TABLE_ALIAS}[\"{key}\"]";
+				else
+					element = $"{TABLE_ALIAS}.{key}";
 				if (!string.IsNullOrEmpty(projectionList))
 					projectionList = $"{element},{projectionList}";
 				else
@@ -550,7 +554,10 @@ private void CreateCosmosQuery(CosmosDBQuery query,ServiceCursorDef cursorDef, I
 				foreach (string d in projection)
 				{
 					string wholeWordPattern = String.Format(@"\b{0}\b", d);
-					filterProcess = Regex.Replace(filterProcess, wholeWordPattern, $"{TABLE_ALIAS}.{d}");
+					if (Regex.IsMatch(wholeWordPattern, regexSpecialChars))
+						filterProcess = Regex.Replace(filterProcess, wholeWordPattern, $"{TABLE_ALIAS}[\"{d}\"]");
+					else
+						filterProcess = Regex.Replace(filterProcess, wholeWordPattern, $"{TABLE_ALIAS}.{d}");
 				}
 				keyFilterQ = new string[] { filterProcess };
 				allFiltersQuery = allFiltersQuery.Concat(keyFilterQ);
@@ -563,7 +570,10 @@ private void CreateCosmosQuery(CosmosDBQuery query,ServiceCursorDef cursorDef, I
 
 			foreach (string orderAtt in query.OrderBys)
 			{
-				expression = orderAtt.StartsWith("(") ? $"{TABLE_ALIAS}.{orderAtt.Remove(orderAtt.Length-1,1).Remove(0,1)} DESC" : $"{TABLE_ALIAS}.{orderAtt} ASC";
+				if (!Regex.IsMatch(orderAtt, regexSpecialChars))
+					expression = orderAtt.StartsWith("(") ? $"{TABLE_ALIAS}.{orderAtt.Remove(orderAtt.Length-1,1).Remove(0,1)} DESC" : $"{TABLE_ALIAS}.{orderAtt} ASC";
+				else
+					expression = orderAtt.StartsWith("(") ? $"{TABLE_ALIAS}[\"{orderAtt.Remove(orderAtt.Length - 1, 1).Remove(0, 1)}\"] DESC" : $"{TABLE_ALIAS}[\"{orderAtt}\"] ASC";
 				orderExpressionList = orderExpressionList.Concat(new string[] { expression });
 			}