Verify that interface-based projections work with subselects

pom.xml

@@ -5,7 +5,7 @@
 
 	<groupId>org.springframework.data</groupId>
 	<artifactId>spring-data-jpa</artifactId>
-	<version>2.3.0.BUILD-SNAPSHOT</version>
+	<version>2.3.0.DATAJPA-1713-SNAPSHOT</version>
 
 	<name>Spring Data JPA</name>
 	<description>Spring Data module for JPA repositories.</description>

src/test/java/org/springframework/data/jpa/repository/UserRepositoryFinderTests.java

@@ -281,4 +281,17 @@ public void rejectsStreamExecutionIfNoSurroundingTransactionActive() {
 	public void executesNamedQueryWithConstructorExpression() {
 		userRepository.findByNamedQueryWithConstructorExpression();
 	}
+
+	@Test // DATAJPA-1713
+	public void selectProjectionWithSubselect() {
+
+		List<UserRepository.NameOnly> list = userRepository.findProjectionBySubselect();
+		assertThat(list).isNotEmpty() //
+				.allSatisfy(no -> {
+
+					assertThat(no.getFirstname()).describedAs("firstname").isNotNull();
+					assertThat(no.getLastname()).describedAs("lastname").isNotNull();
+				});
+
+	}
 }

src/test/java/org/springframework/data/jpa/repository/sample/UserRepository.java

@@ -612,6 +612,10 @@ Page<User> findAllOrderedBySpecialNameMultipleParams(@Param("name") String name,
 	// DATAJPA-1303
 	Page<User> findByAttributesIgnoreCaseIn(Pageable pageable, String... attributes);
 
+	// DATAJPA-1713
+	@Query("select u from User u where firstname >= (select Min(u0.firstname) from User u0 )")
+	List<NameOnly> findProjectionBySubselect();
+
 	interface RolesAndFirstname {
 
 		String getFirstname();