HHH-10279 - Memory usage improvements -

* Don't allocate IdentityMap if it is not needed
* Only allocate unresolved insertions if requied
* Don't create a new string when creating a named query
* Allocate querySpaces lazily
* Remove executableLists from ActionQueue
* Allocate ExecutableList instances lazily
* Lazily allocate the transaction commit task lists
* Don't allocate a new EntityKey

Author: stuartwdouglas

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

@@ -213,7 +213,12 @@ public List performList(
 
 		final int guessedResultSize = guessResultSize( rowSelection );
 		final List combinedResults = new ArrayList( guessedResultSize );
-		final IdentitySet distinction = new IdentitySet( guessedResultSize );
+		final IdentitySet distinction;
+		if ( needsLimit ) {
+			distinction = new IdentitySet(guessedResultSize);
+		} else {
+			distinction = null;
+		}
 		int includedCount = -1;
 		translator_loop:
 		for ( QueryTranslator translator : translators ) {