NH-3222 - Auto-discover types if query requires so

Author: hazzik

src/NHibernate/Impl/MultiQueryImpl.cs

@@ -537,6 +537,11 @@ protected List<object> DoList()
 							Loader.Loader.Advance(reader, selection);
 						}
 
+						if (parameter.HasAutoDiscoverScalarTypes)
+						{
+							translator.Loader.AutoDiscoverTypes(reader);
+						}
+
 						LockMode[] lockModeArray = translator.Loader.GetLockModes(parameter.LockModes);
 						EntityKey optionalObjectKey = Loader.Loader.GetOptionalObjectKey(parameter, session);
 
@@ -631,9 +636,9 @@ private void AggregateQueriesInformation()
 			int queryIndex = 0;
 			foreach (AbstractQueryImpl query in queries)
 			{
+				query.VerifyParameters();
 				QueryParameters queryParameters = query.GetQueryParameters();
 				queryParameters.ValidateParameters();
-				query.VerifyParameters();
 				foreach (var translator in query.GetTranslators(session, queryParameters))
 				{
 					translators.Add(translator);

src/NHibernate/Loader/Custom/CustomLoader.cs

@@ -311,7 +311,7 @@ public override IList GetResultList(IList results, IResultTransformer resultTran
 			}
 		}
 
-		protected override void AutoDiscoverTypes(IDataReader rs)
+		protected internal override void AutoDiscoverTypes(IDataReader rs)
 		{
 			MetaData metadata = new MetaData(rs);
 			List<string> aliases = new List<string>();

src/NHibernate/Loader/Loader.cs

@@ -1289,7 +1289,7 @@ protected IDataReader GetResultSet(IDbCommand st, bool autoDiscoverTypes, bool c
 			}
 		}
 
-		protected virtual void AutoDiscoverTypes(IDataReader rs)
+		protected internal virtual void AutoDiscoverTypes(IDataReader rs)
 		{
 			throw new AssertionFailure("Auto discover types not supported in this loader");
 		}