Fix test

Author: timoninmaxim

modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/exec/rel/HashAggregateNode.java

@@ -25,6 +25,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.function.BiFunction;
+import java.util.function.Function;
 import java.util.function.Supplier;
 import org.apache.calcite.rel.type.RelDataType;
 import org.apache.calcite.util.ImmutableBitSet;
@@ -251,6 +252,9 @@ private class Grouping {
         /** */
         private final BiFunction<GroupKey, List<AccumulatorWrapper<Row>>, List<AccumulatorWrapper<Row>>> getOrCreateGroup;
 
+        /** */
+        private final Function<GroupKey, List<AccumulatorWrapper<Row>>> createGroup;
+
         /** */
         private Grouping(byte grpId, ImmutableBitSet grpFields) {
             this.grpId = grpId;
@@ -259,6 +263,8 @@ private Grouping(byte grpId, ImmutableBitSet grpFields) {
             grpKeyBld = GroupKey.builder(grpFields.cardinality());
             handler = context().rowHandler();
 
+            createGroup = (k) -> create();
+
             getOrCreateGroup = (k, v) -> {
                 if (v == null) {
                     grpKeyBld = GroupKey.builder(grpFields.cardinality());
@@ -332,7 +338,7 @@ private void addOnReducer(Row row) {
 
             GroupKey grpKey = (GroupKey)handler.get(1, row);
 
-            List<AccumulatorWrapper<Row>> wrappers = groups.get(grpKey);
+            List<AccumulatorWrapper<Row>> wrappers = groups.computeIfAbsent(grpKey, createGroup);
             Accumulator<Row>[] accums = hasAccumulators() ? (Accumulator<Row>[])handler.get(2, row) : null;
 
             for (int i = 0; i < F.size(wrappers); i++) {