try to fix last test

Author: zvonand

src/Storages/ObjectStorage/DataLakes/Iceberg/IcebergIterator.cpp

@@ -135,12 +135,12 @@ std::optional<ManifestFileEntry> SingleThreadIcebergKeysIterator::next()
                 data_snapshot->manifest_list_entries[manifest_file_index].added_sequence_number,
                 data_snapshot->manifest_list_entries[manifest_file_index].added_snapshot_id,
                 secondary_storages);
+            current_files = files_generator(current_manifest_file_content);
             internal_data_index = 0;
         }
-        const auto & files = files_generator(current_manifest_file_content);
-        while (internal_data_index < files.size())
+        while (internal_data_index < current_files.size())
         {
-            const auto & manifest_file_entry = files[internal_data_index++];
+            const auto & manifest_file_entry = current_files[internal_data_index++];
             if ((manifest_file_entry.schema_id != previous_entry_schema) && (use_partition_pruning))
             {
                 previous_entry_schema = manifest_file_entry.schema_id;
@@ -175,6 +175,7 @@ std::optional<ManifestFileEntry> SingleThreadIcebergKeysIterator::next()
             }
         }
         current_manifest_file_content = nullptr;
+        current_files.clear();
         current_pruner = std::nullopt;
         ++manifest_file_index;
         internal_data_index = 0;

src/Storages/ObjectStorage/DataLakes/Iceberg/IcebergIterator.h

@@ -69,6 +69,7 @@ class SingleThreadIcebergKeysIterator
     size_t manifest_file_index = 0;
     size_t internal_data_index = 0;
     Iceberg::ManifestFilePtr current_manifest_file_content;
+    std::vector<ManifestFileEntry> current_files;
     Int32 previous_entry_schema = -1;
     std::optional<Iceberg::ManifestFilesPruner> current_pruner;