HHH-10301 Don't allocate a new List if it is not required

Author: stuartwdouglas

hibernate-core/src/main/java/org/hibernate/engine/query/spi/HQLQueryPlan.java

@@ -211,6 +211,10 @@ public List performList(
 			queryParametersToUse = queryParameters;
 		}
 
+		//fast path to avoid unnecessary allocation and copying
+		if ( translators.length == 1 ) {
+			return translators[0].list( session, queryParametersToUse );
+		}
 		final int guessedResultSize = guessResultSize( rowSelection );
 		final List combinedResults = new ArrayList( guessedResultSize );
 		final IdentitySet distinction;