And waits for them. That's pointless.
for (const auto & expr : expr_list->children)
                    indices_recalc_expr_list->children.push_back(expr->clone());
            }
        }
        
        else
        {
            bool mutate = false;
            const auto & index_cols = index.expression->getRequiredColumns();
            for (const auto & col : index_cols)
            {
                if (updated_columns.count(col))
                {
                    mutate = true;
                    break;
                }
            }
            if (mutate && indices_to_recalc.insert(index_factory.get(index)).second)
            {
                ASTPtr expr_list = index.expression_list_ast->clone();
                for (const auto & expr : expr_list->children)
                    indices_recalc_expr_list->children.push_back(expr->clone());
            }
        }
    }
    if (!indices_to_recalc.empty() && input_stream)
    {
        auto indices_recalc_syntax = TreeRewriter(context).analyze(indices_recalc_expr_list, input_stream->getHeader().getNamesAndTypesList());
        auto indices_recalc_expr = ExpressionAnalyzer(
                indices_recalc_expr_list,