ascherbakoff commented on code in PR #6007:
URL: https://github.com/apache/ignite-3/pull/6007#discussion_r2158223683


##########
modules/client/src/main/java/org/apache/ignite/internal/client/table/ClientTable.java:
##########
@@ -877,12 +877,135 @@ int tryGetPartitionCount() {
         return partitionCount;
     }
 
+    /**
+     * Batch with indexes.
+     *
+     * @param <E> Batch type element.
+     */
+    static class Batch<E> {
+        List<E> batch = new ArrayList<>();
+        List<Integer> originalIndices = new ArrayList<>();
+
+        void add(E entry, int origIdx) {
+            batch.add(entry);
+            originalIndices.add(origIdx);
+        }
+    }
+
+    private static <E> void reduceWithKeepOrder(List<E> agg, List<E> cur, 
List<Integer> originalIndices) {
+        for (int i = 0; i < cur.size(); i++) {
+            E val = cur.get(i);
+            Integer orig = originalIndices.get(i);
+            agg.set(orig, val);
+        }
+    }
+
+    <R, E> CompletableFuture<R> split(
+            Transaction tx,
+            Collection<E> keys,
+            BiFunction<Collection<E>, PartitionAwarenessProvider, 
CompletableFuture<R>> fun,
+            @Nullable R initialValue,
+            Reducer<R> reducer,
+            BiFunction<ClientSchema, E, Integer> hashFunc
+    ) {
+        assert tx != null;
+
+        CompletableFuture<ClientSchema> schemaFut = getSchema(latestSchemaVer);
+        CompletableFuture<List<String>> partitionsFut = 
getPartitionAssignment();
+
+        return CompletableFuture.allOf(schemaFut, partitionsFut)
+                .thenCompose(v -> {
+                    @Nullable List<String> aff = partitionsFut.getNow(null);
+                    Map<Integer, List<E>> mapped = new HashMap<>();
+                    List<CompletableFuture<R>> res = new ArrayList<>();
+
+                    if (aff == null) {
+                        return fun.apply(keys, 
PartitionAwarenessProvider.NULL_PROVIDER);
+                    }
+
+                    for (E key : keys) {
+                        ClientSchema schema = schemaFut.getNow(null);

Review Comment:
   🆗 



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