fix bad merge

src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp

@@ -1041,11 +1041,6 @@ Pipes MergeTreeDataSelectExecutor::spreadMarkRangesAmongStreamsWithOrder(
                     sort_description.emplace_back(data.sorting_key_columns[j], input_sorting_info->direction, 1);
             }
 
-            /// Project input columns to drop columns from sorting_key_prefix_expr
-            /// to allow execute the same expression later.
-            /// NOTE: It may lead to double computation of expression.
-            auto projection = createProjection(pipes.back(), data);
-
             /// Project input columns to drop columns from sorting_key_prefix_expr
             /// to allow execute the same expression later.
             /// NOTE: It may lead to double computation of expression.