Detect COUNT(*) function alias in QueryUtils.

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

@@ -90,6 +90,7 @@
  * @author Yanming Zhou
  * @author Alim Naizabek
  * @author Jakub Soltys
+ * @author Young-ho Kim
  */
 public abstract class QueryUtils {
 
@@ -184,7 +185,7 @@ public abstract class QueryUtils {
 
 		builder = new StringBuilder();
 		// any function call including parameters within the brackets
-		builder.append("\\w+\\s*\\([\\w\\.,\\s'=:;\\\\?]+\\)");
+		builder.append("\\w+\\s*\\([\\w\\.,\\s'=:;\\\\?\\*]+\\)");
 		// the potential alias
 		builder.append("\\s+(?:as)+\\s+([\\w\\.]+)");
 

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

@@ -52,6 +52,7 @@
  * @author Pranav HS
  * @author Eduard Dudar
  * @author Mark Paluch
+ * @author Young-ho Kim
  */
 class QueryUtilsUnitTests {
 
@@ -560,6 +561,13 @@ void discoversFunctionAliasesCorrectly() {
 		assertThat(getFunctionAliases("COUNT(1) as alias1, 2 as alias2")).containsExactly("alias1");
 	}
 
+	@Test // GH-4242
+	void discoversCountStarFunctionAlias() {
+
+		assertThat(getFunctionAliases("SELECT COUNT(*) as total FROM User u")).containsExactly("total");
+		assertThat(getFunctionAliases("SELECT u, COUNT(*) as cnt FROM User u GROUP BY u")).containsExactly("cnt");
+	}
+
 	@Test // GH-3911
 	void discoversFieldAliasesCorrectly() {