feat: Add support for the remaining aggregate functions.

See #519.

neo4j-jdbc-translator/impl/src/main/java/org/neo4j/jdbc/translator/impl/SqlToCypher.java

@@ -962,6 +962,18 @@ else if (f instanceof QOM.Min<?> m) {
 			else if (f instanceof QOM.Max<?> m) {
 				return Cypher.max(expression(m.$field()));
 			}
+			else if (f instanceof QOM.Sum s) {
+				return Cypher.sum(expression(s.$field()));
+			}
+			else if (f instanceof QOM.Avg s) {
+				return Cypher.avg(expression(s.$field()));
+			}
+			else if (f instanceof QOM.StddevSamp s) {
+				return Cypher.stDev(expression(s.$field()));
+			}
+			else if (f instanceof QOM.StddevPop s) {
+				return Cypher.stDevP(expression(s.$field()));
+			}
 			else if (f instanceof QOM.Position p) {
 				return Cypher.call(FUNCTION_MAPPING.get("strpos"))
 					.withArgs(expression(p.$in()), expression(p.$arg2()))

neo4j-jdbc-translator/impl/src/test/java/org/neo4j/jdbc/translator/impl/SqlToCypherTests.java

@@ -269,6 +269,25 @@ void simpleUpdateShouldWork() {
 			.isEqualTo("MATCH (a:Actor) WHERE id(a) = 4711 SET a.name = 'Foo'");
 	}
 
+	@ParameterizedTest
+	@CsvSource(delimiterString = "|", textBlock = """
+			SELECT name, count(*) FROM People p GROUP BY name|MATCH (p:People) RETURN p.name, count(*)
+			SELECT name, max(age) FROM People p GROUP BY name|MATCH (p:People) RETURN p.name, max(p.age)
+			SELECT name, min(age) FROM People p GROUP BY name|MATCH (p:People) RETURN p.name, min(p.age)
+			SELECT sum(age) FROM People p GROUP BY name|MATCH (p:People) RETURN sum(p.age)
+			SELECT avg(age) FROM People p GROUP BY name|MATCH (p:People) RETURN avg(p.age)
+			SELECT percentileCont(age) FROM People p GROUP BY name|MATCH (p:People) RETURN percentileCont(p.age)
+			SELECT percentileDisc(age) FROM People p GROUP BY name|MATCH (p:People) RETURN percentileDisc(p.age)
+			SELECT stDev(age) FROM People p GROUP BY name|MATCH (p:People) RETURN stDev(p.age)
+			SELECT stDevP(age) FROM People p GROUP BY name|MATCH (p:People) RETURN stDevP(p.age)
+			""")
+	void aggregates(String sql, String cypher) {
+
+		var translator = SqlToCypher.defaultTranslator();
+		assertThat(translator.translate(sql)).isEqualTo(cypher);
+
+	}
+
 	@Test
 	void outerSelectStarShouldBeRemoved() {