indexing - ERROR 188 (HY000): FTS query exceeds result cache limit mysql -


i have full text index on text column of table around 11 million rows.

table structure :

create table `review` (   `id` int(11) not null auto_increment,   `comments` text collate utf8mb4_unicode_ci,   `title` varchar(1000) collate utf8mb4_unicode_ci default null,   primary key (`id`),   key `reviewer_id` (`reviewer_id`),   fulltext key `comments` (`comments`) ) engine=innodb auto_increment=273001866 default charset=utf8mb4 collate=utf8mb4_unicode_ci row_format=compressed;

i tried search :

select      id     review  match (comments) against ('"this review campus tours , not university no 1 can write review on university"' in boolean mode)

this throwing following error :

error 188 (hy000): fts query exceeds result cache limit

google says bug has been fixed mysql in 5.7. using 5.7.19. idea how resolve this. copy pasting ft variables: 

mysql> show global variables 'innodb_ft%'; +---------------------------------+--------------------+ | variable_name                   | value              | +---------------------------------+--------------------+ | innodb_ft_aux_table             |                    | | innodb_ft_cache_size            | 8000000            | | innodb_ft_enable_diag_print     | off                | | innodb_ft_enable_stopword       | on                 | | innodb_ft_max_token_size        | 84                 | | innodb_ft_min_token_size        | 3                  | | innodb_ft_num_word_optimize     | 2000               | | innodb_ft_result_cache_limit    | 2000000000         | | innodb_ft_server_stopword_table | local/my_stopwords | | innodb_ft_sort_pll_degree       | 2                  | | innodb_ft_total_cache_size      | 640000000          | | innodb_ft_user_stopword_table   |                    | +---------------------------------+--------------------+ 12 rows in set (0.00 sec)


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