HQL queries without a primary alias don't need Sorted properties pref…

…ixed.

If a Hibernate query doesn't have a primary alias, don't attempt to prefix any Sort properties using it.

See #2969
Original Pull Request #2971

spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/JpaQueryTransformerSupport.java

@@ -12,6 +12,7 @@
 import org.springframework.data.domain.Sort;
 import org.springframework.data.jpa.domain.JpaSort;
 import org.springframework.lang.Nullable;
+import org.springframework.util.ObjectUtils;
 
 /**
  * Transformational operations needed to support either {@link HqlQueryTransformer} or {@link JpqlQueryTransformer}.
@@ -103,7 +104,7 @@ private void checkSortExpression(Sort.Order order) {
 	 */
 	private String generateOrderByArgument(@Nullable String primaryFromAlias, Sort.Order order) {
 
-		if (shouldPrefixWithAlias(order)) {
+		if (shouldPrefixWithAlias(order, primaryFromAlias)) {
 			return primaryFromAlias + "." + order.getProperty();
 		} else {
 			return order.getProperty();
@@ -115,9 +116,15 @@ private String generateOrderByArgument(@Nullable String primaryFromAlias, Sort.O
 	 * FROM clause's alias.
 	 *
 	 * @param order
+	 * @param primaryFromAlias
 	 * @return boolean whether or not to apply the primary FROM clause's alias as a prefix
 	 */
-	private boolean shouldPrefixWithAlias(Sort.Order order) {
+	private boolean shouldPrefixWithAlias(Sort.Order order, String primaryFromAlias) {
+
+		// If there is no primary alias
+		if (ObjectUtils.isEmpty(primaryFromAlias)) {
+			return false;
+		}
 
 		// If the Sort contains a function
 		if (order.getProperty().contains("(")) {

spring-data-jpa/src/test/java/org/springframework/data/jpa/repository/query/HqlQueryTransformerTests.java

@@ -966,6 +966,13 @@ void shouldHandleAliasInsideCaseStatement() {
 						"order by newDateDue desc");
 	}
 
+	@Test // GH-2969
+	void fromWithoutAPrimaryAliasShouldWork() {
+
+		assertThat(createQueryFor("FROM Story WHERE enabled = true", Sort.by(Sort.Direction.DESC, "created")))
+				.isEqualTo("FROM Story WHERE enabled = true order by created desc");
+	}
+
 	private void assertCountQuery(String originalQuery, String countQuery) {
 		assertThat(createCountQueryFor(originalQuery)).isEqualTo(countQuery);
 	}