HHH-19033 - Restore Derby dialect in the community dialects

hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/CommunityDatabase.java

@@ -226,6 +226,23 @@ public boolean productNameMatches(String databaseName) {
 		public String getDriverClassName(String jdbcUrl) {
 			return "com.singlestore.jdbc.Driver";
 		}
+	},
+
+	DERBY {
+		@Override
+		public Dialect createDialect(DialectResolutionInfo info) {
+			return new DerbyDialect( info );
+		}
+		@Override
+		public boolean productNameMatches(String databaseName) {
+			return "Apache Derby".equals( databaseName );
+		}
+		@Override
+		public String getDriverClassName(String jdbcUrl) {
+			return jdbcUrl.startsWith( "jdbc:derby://" )
+					? "org.apache.derby.jdbc.ClientDriver"
+					: "org.apache.derby.jdbc.EmbeddedDriver";
+		}
 	};
 
 	/**

hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/CommunityDialectSelector.java

@@ -50,6 +50,8 @@ public Class<? extends Dialect> resolve(String name) {
 				return TimesTenDialect.class;
 			case "SingleStore":
 				return SingleStoreDialect.class;
+			case "Derby":
+				return DerbyDialect.class;
 		}
 		return null;
 	}

hibernate-community-dialects/src/test/java/org/hibernate/community/dialect/CommunityDialectSelectorTest.java

@@ -28,6 +28,7 @@ public void verifyAllDialectNamingResolve() {
 		testDialectNamingResolution( TeradataDialect.class );
 		testDialectNamingResolution( TimesTenDialect.class );
 		testDialectNamingResolution( SingleStoreDialect.class );
+		testDialectNamingResolution( DerbyDialect.class );
 	}
 
 	private void testDialectNamingResolution(final Class<?> dialectClass) {