Fix aggregation flow with remote initiator

src/Storages/ObjectStorage/StorageObjectStorageCluster.cpp

@@ -36,6 +36,8 @@ namespace Setting
     extern const SettingsObjectStorageGranularityLevel cluster_table_function_split_granularity;
     extern const SettingsBool parallel_replicas_for_cluster_engines;
     extern const SettingsString object_storage_cluster;
+    extern const SettingsBool object_storage_remote_initiator;
+    extern const SettingsString object_storage_remote_initiator_cluster;
     extern const SettingsInt64 delta_lake_snapshot_start_version;
     extern const SettingsInt64 delta_lake_snapshot_end_version;
     extern const SettingsUInt64 lock_object_storage_task_distribution_ms;
@@ -720,7 +722,9 @@ QueryProcessingStage::Enum StorageObjectStorageCluster::getQueryProcessingStage(
     ContextPtr context, QueryProcessingStage::Enum to_stage, const StorageSnapshotPtr & storage_snapshot, SelectQueryInfo & query_info) const
 {
     /// Full query if fall back to pure storage.
-    if (getClusterName(context).empty())
+    if (getClusterName(context).empty()  // Not cluster request
+        && !(context->getSettingsRef()[Setting::object_storage_remote_initiator]  // Not request with remote initiator
+            && !context->getSettingsRef()[Setting::object_storage_remote_initiator_cluster].value.empty()))
         return QueryProcessingStage::Enum::FetchColumns;
 
     /// Distributed storage.

src/TableFunctions/TableFunctionObjectStorageClusterFallback.cpp

@@ -117,7 +117,10 @@ void TableFunctionObjectStorageClusterFallback<Definition, Base>::parseArguments
     const auto & settings = context->getSettingsRef();
 
     is_cluster_function = !settings[Setting::object_storage_cluster].value.empty() && typename Base::Configuration().isClusterSupported();
-    is_remote = settings[Setting::object_storage_remote_initiator];
+    // Remote initiator requires 'object_storage_cluster' or 'object_storage_remote_initiator_cluster'
+    is_remote = settings[Setting::object_storage_remote_initiator]
+        && (!settings[Setting::object_storage_cluster].value.empty()
+            || !settings[Setting::object_storage_remote_initiator_cluster].value.empty());
 
     if (is_cluster_function)
     {

tests/integration/test_s3_cluster/test.py

@@ -1509,3 +1509,78 @@ def test_object_storage_remote_initiator_without_cluster_function(started_cluste
     assert users[1:] == ["s0_0_0\tdefault",
                      "s0_0_1\tfoo",
                      "s0_1_0\tfoo"]
+
+
+def test_object_storage_remote_initiator_aggregation(started_cluster):
+    node = started_cluster.instances["s0_0_0"]
+
+    # Remove initiator without cluster request
+    # Check that aggregation works on nodes
+    query_id = uuid.uuid4().hex
+
+    result = node.query(
+        f"""
+        SELECT sum(value) from s3(
+            'http://minio1:9001/root/data/{{clickhouse,database}}/*', 'minio', '{minio_secret_key}', 'CSV',
+            'name String, value UInt32, polygon Array(Array(Tuple(Float64, Float64)))')
+        SETTINGS
+            object_storage_remote_initiator=1,
+            object_storage_remote_initiator_cluster='cluster_with_dots_and_user'
+        """,
+        query_id = query_id,
+    )
+
+    assert result == "67802152770\n"
+
+    node.query("SYSTEM FLUSH LOGS ON CLUSTER 'cluster_all'")
+    result_rows = node.query(
+        f"""
+        SELECT sum(result_rows)
+            FROM clusterAllReplicas('cluster_all', system.query_log)
+            WHERE type='QueryFinish' AND initial_query_id='{query_id}'
+                AND is_initial_query = 0
+            ORDER BY ALL
+            FORMAT TSV
+        """
+    ).splitlines()
+
+    # Data processed on cluster 'hidden_cluster_with_username_and_password'.
+    # Cluster contains two nodes, each returns one row.
+    assert result_rows == ["2"]
+
+    # Remove initiator without cluster request
+    # Check that aggregation works on nodes
+    query_id = uuid.uuid4().hex
+
+    result = node.query(
+        f"""
+        SELECT value % 2 as bit, sum(value) from s3(
+            'http://minio1:9001/root/data/{{clickhouse,database}}/*', 'minio', '{minio_secret_key}', 'CSV',
+            'name String, value UInt32, polygon Array(Array(Tuple(Float64, Float64)))')
+        GROUP BY bit
+        ORDER BY bit
+        SETTINGS
+            object_storage_remote_initiator=1,
+            object_storage_remote_initiator_cluster='cluster_with_dots_and_user'
+        """,
+        query_id = query_id,
+    )
+
+    assert result == "0\t41117771522\n1\t26684381248\n"
+
+    node.query("SYSTEM FLUSH LOGS ON CLUSTER 'cluster_all'")
+    result_rows = node.query(
+        f"""
+        SELECT sum(result_rows)
+            FROM clusterAllReplicas('cluster_all', system.query_log)
+            WHERE type='QueryFinish' AND initial_query_id='{query_id}'
+                AND is_initial_query = 0
+            ORDER BY ALL
+            FORMAT TSV
+        """
+    ).splitlines()
+
+    # Data processed on cluster 'hidden_cluster_with_username_and_password'.
+    # Cluster contains two nodes, each returns up to two rows, at least two rows totaly.
+    result_rows = int(result_rows[0])
+    assert result_rows >= 2 and result_rows <= 4