Properly handle ignoreCase for aliased fields.

When writing a select with a field alias, properly handle Sort.Order's ignoreCase.

Closes #2280
Original pull request #2399

Author: gregturn

src/main/java/org/springframework/data/jpa/repository/query/QueryUtils.java

@@ -38,11 +38,11 @@
 import javax.persistence.criteria.Join;
 import javax.persistence.criteria.JoinType;
 import javax.persistence.metamodel.Attribute;
+import javax.persistence.metamodel.Attribute.PersistentAttributeType;
 import javax.persistence.metamodel.Bindable;
 import javax.persistence.metamodel.ManagedType;
 import javax.persistence.metamodel.PluralAttribute;
 import javax.persistence.metamodel.SingularAttribute;
-import javax.persistence.metamodel.Attribute.PersistentAttributeType;
 
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.dao.InvalidDataAccessApiUsageException;
@@ -73,6 +73,7 @@
  * @author Mohammad Hewedy
  * @author Andriy Redko
  * @author Peter Großmann
+ * @author Greg Turnquist
  */
 public abstract class QueryUtils {
 
@@ -291,7 +292,9 @@ private static String getOrderClause(Set<String> joinAliases, Set<String> select
 		checkSortExpression(order);
 
 		if (selectionAlias.contains(property)) {
-			return String.format("%s %s", property, toJpaDirection(order));
+			return String.format("%s %s", //
+					order.isIgnoreCase() ? String.format("lower(%s)", property) : property, //
+					toJpaDirection(order));
 		}
 
 		boolean qualifyReference = !property.contains("("); // ( indicates a function
@@ -465,6 +468,7 @@ public static String createCountQueryFor(String originalQuery) {
 	 * @param originalQuery must not be {@literal null}.
 	 * @param countProjection may be {@literal null}.
 	 * @return a query String to be used a count query for pagination. Guaranteed to be not {@literal null}.
+	 * @return a query String to be used a count query for pagination. Guaranteed to be not {@literal null}.
 	 * @since 1.6
 	 * @deprecated use {@link DeclaredQuery#deriveCountQuery(String, String)} instead.
 	 */

src/test/java/org/springframework/data/jpa/repository/query/QueryUtilsUnitTests.java

@@ -39,6 +39,7 @@
  * @author Florian Lüdiger
  * @author Grégoire Druant
  * @author Mohammad Hewedy
+ * @author Greg Turnquist
  */
 class QueryUtilsUnitTests {
 
@@ -444,6 +445,18 @@ void appliesSortCorrectlyForFieldAliases() {
 		assertThat(fullQuery).endsWith("order by authorName asc");
 	}
 
+	@Test // GH-2280
+	void appliesOrderingCorrectlyForFieldAliasWithIgnoreCase() {
+
+		String query = "SELECT customer.id as id, customer.name as name FROM CustomerEntity customer";
+		Sort sort = Sort.by(Order.by("name").ignoreCase());
+
+		String fullQuery = applySorting(query, sort);
+
+		assertThat(fullQuery).isEqualTo(
+				"SELECT customer.id as id, customer.name as name FROM CustomerEntity customer order by lower(name) asc");
+	}
+
 	@Test // DATAJPA-1061
 	void appliesSortCorrectlyForFunctionAliases() {