James-Jeyun-Kim commented on a change in pull request #2422:
URL: https://github.com/apache/calcite/pull/2422#discussion_r646890941



##########
File path: 
core/src/test/java/org/apache/calcite/rel/rel2sql/RelToSqlConverterTest.java
##########
@@ -3131,19 +3132,36 @@ private void checkLiteral2(String expression, String 
expected) {
             + "OVER (PARTITION BY \"hire_date\" ORDER BY \"employee_id\"), 
\"hire_date\"\n"
             + "FROM \"foodmart\".\"employee\"\n"
             + "GROUP BY \"hire_date\", \"employee_id\"";
+
+    HepProgramBuilder builder = new HepProgramBuilder();
+    builder.addRuleClass(ProjectToWindowRule.class);
+    HepPlanner hepPlanner = new HepPlanner(builder.build());
+    RuleSet rules = 
RuleSets.ofList(CoreRules.PROJECT_TO_LOGICAL_PROJECT_AND_WINDOW);
+
+    sql(query0).optimize(rules, hepPlanner).ok(expected0);
+    sql(query1).optimize(rules, hepPlanner).ok(expected1);
+    sql(query2).optimize(rules, hepPlanner).ok(expected2);
+    sql(query3).optimize(rules, hepPlanner).ok(expected3);
+    sql(query4).optimize(rules, hepPlanner).ok(expected4);
+    sql(query5).optimize(rules, hepPlanner).ok(expected5);
+    sql(query6).optimize(rules, hepPlanner).ok(expected6);
+  }
+
+  @Disabled
+  @Test void testConvertWindowToSql2() {
     String query7 = "SELECT "
-        + "count(distinct \"employee_id\") over (order by \"hire_date\") FROM 
\"employee\"";
+        + "count(\"employee_id\") over (order by \"hire_date\") FROM 
\"employee\"";

Review comment:
       I included these failing tests in my test case in SqlValidatorTest




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