HHH-19908 make 'this' case-insensitive

Author: gavinking

hibernate-core/src/main/java/org/hibernate/query/hql/internal/SqmPathRegistryImpl.java

@@ -240,8 +240,8 @@ else if ( parentRegistered instanceof Join<?, ?> join ) {
 		}
 
 		final boolean onlyOneFrom = sqmFromByPath.size() == 1;
-		if ( onlyOneFrom && localAlias.equals( "this" ) ) {
-			final SqmRoot<?> root = (SqmRoot<?>) sqmFromByPath.entrySet().iterator().next().getValue();
+		if ( onlyOneFrom && localAlias.equalsIgnoreCase( "this" ) ) {
+			final var root = (SqmRoot<?>) sqmFromByPath.entrySet().iterator().next().getValue();
 			if (  root.getAlias() == null ) {
 				//noinspection unchecked
 				return (X) root;