support Pageable.unpaged(sort)

Resolves: #3476
Original pull request: #3514

Author: yoa1226

spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/support/SimpleJpaRepository.java

@@ -428,6 +428,9 @@ public List<T> findAll(Sort sort) {
 	public Page<T> findAll(Pageable pageable) {
 
 		if (pageable.isUnpaged()) {
+			if(pageable.getSort().isSorted()) {
+				return new PageImpl<>(findAll(pageable.getSort()));
+			}
 			return new PageImpl<>(findAll());
 		}
 

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

@@ -1727,6 +1727,22 @@ void pageableQueryReportsTotalFromCount() {
 		assertThat(secondPage.getTotalElements()).isEqualTo(4L);
 	}
 
+	@Test // GH-3476
+	void unPageableQueryUnPagedSorted() {
+
+		flushTestUsers();
+
+		Page<User> firstPage = repository.findAll(PageRequest.of(0, 10));
+		assertThat(firstPage.getContent()).hasSize(4);
+		assertThat(firstPage.getTotalElements()).isEqualTo(4L);
+
+
+		Page<User> secondPage = repository.findAll(Pageable.unpaged(Sort.by(DESC, "age")));
+		assertThat(secondPage.getContent()).hasSize(4);
+		assertThat(secondPage.getContent()).containsExactly(thirdUser, secondUser, fourthUser, firstUser);
+		assertThat(secondPage.getTotalElements()).isEqualTo(4L);
+	}
+
 	@Test // DATAJPA-506
 	void invokesQueryWithWrapperType() {