Jackie-Jiang commented on code in PR #14941:
URL: https://github.com/apache/pinot/pull/14941#discussion_r2019059134


##########
pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/AggregationFunctionType.java:
##########
@@ -179,8 +179,13 @@ public enum AggregationFunctionType {
   // funnel aggregate functions
   FUNNELMAXSTEP("funnelMaxStep", ReturnTypes.INTEGER, OperandTypes.VARIADIC, 
SqlTypeName.OTHER),
   FUNNELCOMPLETECOUNT("funnelCompleteCount", ReturnTypes.INTEGER, 
OperandTypes.VARIADIC, SqlTypeName.OTHER),
+  FUNNELSTEPDURATIONSTATS("funnelStepDurationStats", new 
ArrayReturnTypeInference(SqlTypeName.DOUBLE),
+      OperandTypes.VARIADIC, SqlTypeName.OTHER),
   FUNNELMATCHSTEP("funnelMatchStep", new 
ArrayReturnTypeInference(SqlTypeName.INTEGER), OperandTypes.VARIADIC,
       SqlTypeName.OTHER),
+  FUNNELEVENTSFUNCTIONEVAL("funnelEventsFunctionEval", new 
ArrayReturnTypeInference(SqlTypeName.VARCHAR),
+      OperandTypes.VARIADIC,
+      SqlTypeName.OTHER),

Review Comment:
   (nit) reformat



##########
pinot-integration-tests/src/test/java/org/apache/pinot/integration/tests/custom/WindowFunnelTest.java:
##########
@@ -883,6 +884,200 @@ public void 
testFunnelCompleteCountGroupByQueriesSkipLeaf(boolean useMultiStageQ
     }
   }
 
+  @Test(dataProvider = "useBothQueryEngines")
+  public void testFunnelEventsFunctionEvalGroupByQueries(boolean 
useMultiStageQueryEngine)
+      throws Exception {
+    setUseMultiStageQueryEngine(useMultiStageQueryEngine);
+    String query =
+        String.format("SELECT "
+            + "userId, funnelEventsFunctionEval(timestampCol, '1000', 4, "
+            + "url = '/product/search', "
+            + "url = '/cart/add', "
+            + "url = '/checkout/start', "
+            + "url = '/checkout/confirmation', "
+            + "3, timestampCol, userId, url"
+            + ") "
+            + "FROM %s GROUP BY userId ORDER BY userId LIMIT %d", 
getTableName(), getCountStarResult());
+    JsonNode jsonNode = postQuery(query);
+    JsonNode rows = jsonNode.get("resultTable").get("rows");
+    assertEquals(rows.size(), 40);
+    for (int i = 0; i < rows.size(); i++) {
+      JsonNode row = rows.get(i);
+      assertEquals(row.size(), 2);
+      assertEquals(row.get(0).textValue(), "user" + (i / 10) + (i % 10));
+      ArrayNode events = (ArrayNode) row.get(1);
+      if (i < 10) {
+        assertEquals(events.size(), 13);
+        assertEquals(events.get(0).asText().split(",")[0], "1");
+        assertEquals(events.get(0).asText().split(",")[1].trim(), "12");
+        assertEquals(events.get(1).asInt(), 1000);
+        assertEquals(events.get(2).asText(), "user0" + i);
+        assertEquals(events.get(3).asText(), "/product/search");
+        assertEquals(events.get(4).asInt(), 1010);
+        assertEquals(events.get(5).asText(), "user0" + i);
+        assertEquals(events.get(6).asText(), "/cart/add");
+        assertEquals(events.get(7).asInt(), 1020);
+        assertEquals(events.get(8).asText(), "user0" + i);
+        assertEquals(events.get(9).asText(), "/checkout/start");
+      } else {
+        assertEquals(events.size(), 1);
+        assertEquals(events.get(0).intValue(), 0);
+      }
+    }
+  }
+
+  @Test(dataProvider = "useBothQueryEngines")
+  public void testFunnelStepDurationStatsGroupByQueries(boolean 
useMultiStageQueryEngine)
+      throws Exception {
+    setUseMultiStageQueryEngine(useMultiStageQueryEngine);
+    String query =
+        String.format("SELECT "
+                + "userId, funnelStepDurationStats(timestampCol, '1000', 4, "

Review Comment:
   (nit) Reformat



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