[Backport] Fix summary row issues in case postaggregations are happening

extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/test/CalciteSelectQueryMSQTest.java

@@ -157,6 +157,18 @@ public void testQueryWithMoreThanMaxNumericInFilter()
 
   }
 
+  @Ignore
+  @Override
+  public void testUnSupportedNullsFirst()
+  {
+  }
+
+  @Ignore
+  @Override
+  public void testUnSupportedNullsLast()
+  {
+  }
+
   /**
    * Same query as {@link CalciteQueryTest#testArrayAggQueryOnComplexDatatypes}. ARRAY_AGG is not supported in MSQ currently.
    * Once support is added, this test can be removed and msqCompatible() can be added to the one in CalciteQueryTest.

processing/src/main/java/org/apache/druid/query/groupby/GroupingEngine.java

@@ -788,11 +788,19 @@ private static boolean summaryRowPreconditions(GroupByQuery query)
   private static Iterator<ResultRow> summaryRowIterator(GroupByQuery q)
   {
     List<AggregatorFactory> aggSpec = q.getAggregatorSpecs();
-    Object[] values = new Object[aggSpec.size()];
+    ResultRow resultRow = ResultRow.create(q.getResultRowSizeWithPostAggregators());
     for (int i = 0; i < aggSpec.size(); i++) {
-      values[i] = aggSpec.get(i).factorize(new AllNullColumnSelectorFactory()).get();
+      resultRow.set(i, aggSpec.get(i).factorize(new AllNullColumnSelectorFactory()).get());
     }
-    return Collections.singleton(ResultRow.of(values)).iterator();
+    Map<String, Object> map = resultRow.toMap(q);
+    for (int i = 0; i < q.getPostAggregatorSpecs().size(); i++) {
+      final PostAggregator postAggregator = q.getPostAggregatorSpecs().get(i);
+      final Object value = postAggregator.compute(map);
+
+      resultRow.set(q.getResultRowPostAggregatorStart() + i, value);
+      map.put(postAggregator.getName(), value);
+    }
+    return Collections.singleton(resultRow).iterator();
   }
 
 }

processing/src/test/java/org/apache/druid/query/groupby/GroupByQueryRunnerTest.java

@@ -12962,6 +12962,9 @@ public void testSummaryrowForEmptyInput()
             new FloatSumAggregatorFactory("idxFloat", "indexFloat"),
             new DoubleSumAggregatorFactory("idxDouble", "index")
         )
+        .setPostAggregatorSpecs(
+            ImmutableList.of(
+                new ExpressionPostAggregator("post", "idx * 2", null, TestExprMacroTable.INSTANCE)))
         .setGranularity(QueryRunnerTestHelper.ALL_GRAN)
         .build();
 
@@ -12976,7 +12979,9 @@ public void testSummaryrowForEmptyInput()
             "idxFloat",
             NullHandling.replaceWithDefault() ? 0.0 : null,
             "idxDouble",
-            NullHandling.replaceWithDefault() ? 0.0 : null
+            NullHandling.replaceWithDefault() ? 0.0 : null,
+            "post",
+            NullHandling.replaceWithDefault() ? 0L : null
         )
     );
 

sql/src/main/java/org/apache/druid/sql/calcite/planner/CalcitePlanner.java

@@ -407,7 +407,8 @@ private SqlValidator createSqlValidator(CalciteCatalogReader catalogReader)
         opTab,
         catalogReader,
         getTypeFactory(),
-        validatorConfig
+        validatorConfig,
+        context.unwrapOrThrow(PlannerContext.class)
     );
   }
 

sql/src/main/java/org/apache/druid/sql/calcite/planner/DruidSqlValidator.java

@@ -30,26 +30,41 @@
 import org.apache.calcite.sql.SqlOperatorTable;
 import org.apache.calcite.sql.parser.SqlParserPos;
 import org.apache.calcite.sql.validate.SqlValidatorScope;
+import org.apache.druid.java.util.common.StringUtils;
+import org.apache.druid.sql.calcite.run.EngineFeature;
 
 /**
  * Druid extended SQL validator. (At present, it doesn't actually
  * have any extensions yet, but it will soon.)
  */
 class DruidSqlValidator extends BaseDruidSqlValidator
 {
+  private final PlannerContext plannerContext;
+
   protected DruidSqlValidator(
       SqlOperatorTable opTab,
       CalciteCatalogReader catalogReader,
       JavaTypeFactory typeFactory,
-      Config validatorConfig
+      Config validatorConfig,
+      PlannerContext plannerContext
   )
   {
     super(opTab, catalogReader, typeFactory, validatorConfig);
+    this.plannerContext = plannerContext;
   }
 
   @Override
   public void validateCall(SqlCall call, SqlValidatorScope scope)
   {
+    if (call.getKind() == SqlKind.OVER) {
+      if (!plannerContext.featureAvailable(EngineFeature.WINDOW_FUNCTIONS)) {
+        throw buildCalciteContextException(
+            StringUtils.format(
+                "The query contains window functions; To run these window functions, enable [%s] in query context.",
+                EngineFeature.WINDOW_FUNCTIONS),
+            call);
+      }
+    }
     if (call.getKind() == SqlKind.NULLS_FIRST) {
       SqlNode op0 = call.getOperandList().get(0);
       if (op0.getKind() == SqlKind.DESCENDING) {

sql/src/main/java/org/apache/druid/sql/calcite/planner/PlannerFactory.java

@@ -182,9 +182,12 @@ public SqlConformance conformance()
                   return DruidConformance.instance();
                 }
               };
-            } else {
-              return null;
             }
+            if (aClass.equals(PlannerContext.class)) {
+              return (C) plannerContext;
+            }
+
+            return null;
           }
         });
 

sql/src/test/java/org/apache/druid/sql/calcite/CalciteQueryTest.java

@@ -14275,4 +14275,15 @@ public void testUnSupportedNullsLast()
         .run());
     assertThat(e, invalidSqlIs("ASCENDING ordering with NULLS LAST is not supported! (line [1], column [41])"));
   }
+
+  @Test
+  public void testWindowingErrorWithoutFeatureFlag()
+  {
+    DruidException e = assertThrows(DruidException.class, () -> testBuilder()
+        .queryContext(ImmutableMap.of(PlannerContext.CTX_ENABLE_WINDOW_FNS, false))
+        .sql("SELECT dim1,ROW_NUMBER() OVER () from druid.foo")
+        .run());
+
+    assertThat(e, invalidSqlIs("The query contains window functions; To run these window functions, enable [WINDOW_FUNCTIONS] in query context. (line [1], column [13])"));
+  }
 }

sql/src/test/java/org/apache/druid/sql/calcite/CalciteSysQueryTest.java

@@ -20,8 +20,10 @@
 package org.apache.druid.sql.calcite;
 
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
 import org.apache.druid.sql.calcite.NotYetSupported.Modes;
 import org.apache.druid.sql.calcite.NotYetSupported.NotYetSupportedProcessor;
+import org.apache.druid.sql.calcite.planner.PlannerContext;
 import org.junit.Rule;
 import org.junit.Test;
 
@@ -53,6 +55,7 @@ public void testTasksSumOver()
     msqIncompatible();
 
     testBuilder()
+        .queryContext(ImmutableMap.of(PlannerContext.CTX_ENABLE_WINDOW_FNS, true))
         .sql("select datasource, sum(duration) over () from sys.tasks group by datasource")
         .expectedResults(ImmutableList.of(
             new Object[]{"foo", 11L},