mariadb/mysql-test/main/statistics_json.test

--echo #
--echo # Test that we can store JSON arrays in histogram field mysql.column_stats when histogram_type=JSON
--echo #

let $histogram_type_override='JSON_HB';
--source statistics.test

--source include/have_stat_tables.inc
--source include/have_sequence.inc
--source include/analyze-format.inc
--disable_warnings
drop table if exists t1;
--enable_warnings

set @save_histogram_type=@@histogram_type;
set @save_histogram_size=@@histogram_size;

create table ten(a int primary key);
insert into ten values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

set histogram_size=100;
set histogram_type='double_prec_hb';
create table t1_bin (a varchar(255));
insert into t1_bin select concat('a-', a) from ten;
analyze table t1_bin persistent for all;
select hex(histogram) from mysql.column_stats where table_name='t1_bin';
explain extended select * from t1_bin where a between 'a-3a' and 'zzzzzzzzz';
analyze select * from t1_bin where a between 'a-3a' and 'zzzzzzzzz';

set histogram_type=json_hb;
create table t1_json (a varchar(255));
insert into t1_json select concat('a-', a) from ten;
analyze table t1_json persistent for all;
select * from mysql.column_stats where table_name='t1_json';
explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz';
analyze select * from t1_json where a between 'a-3a' and 'zzzzzzzzz';
explain extended select * from t1_json where a < 'b-1a';
analyze select * from t1_json where a > 'zzzzzzzzz';

drop table ten;

#
# Test different valid JSON strings that are invalid histograms.
#
UPDATE mysql.column_stats 
SET histogram='["not-what-you-expect"]' WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;

UPDATE mysql.column_stats 
SET histogram='{"histogram_hb_v2":"not-histogram"}' WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;

UPDATE mysql.column_stats 
SET histogram='{"histogram_hb_v2":["not-a-bucket"]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;

UPDATE mysql.column_stats 
SET histogram='{"histogram_hb_v2":[{"no-expected-members":1}]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;

UPDATE mysql.column_stats 
SET histogram='{"histogram_hb_v2":[{"start":{}}]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;

UPDATE mysql.column_stats 
SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":"not-an-integer"}]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;

UPDATE mysql.column_stats 
SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":0.25}]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;

UPDATE mysql.column_stats 
SET histogram='{"histogram_hb_v2":[{"start":"aaa", "size":0.25, "ndv":1}]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;

UPDATE mysql.column_stats 
SET histogram='{"histogram_hb_v2":[]}'
WHERE table_name='t1_json';
FLUSH TABLES;
--error ER_JSON_HISTOGRAM_PARSE_FAILED
explain select * from t1_json limit 1;

--source include/have_sequence.inc
create table t2 (
  city varchar(100)
);
set histogram_size=50;
insert into t2 select 'Moscow' from seq_1_to_99;
insert into t2 select 'Helsinki' from seq_1_to_2;
set histogram_type=json_hb;
analyze table t2 persistent for all;
explain extended select * from t2 where city = 'Moscow';
analyze select * from t2 where city = 'Moscow';
explain extended select * from t2 where city = 'Helsinki';
analyze select * from t2 where city = 'helsinki';
explain extended select * from t2 where city < 'Lagos';

drop table t1_bin;
drop table t1_json;
drop table t2;

DELETE FROM mysql.column_stats;

create schema world;
use world;
--disable_query_log
--disable_result_log
--disable_warnings
--source include/world_schema_utf8.inc
--source include/world.inc
--enable_warnings
--enable_result_log
--enable_query_log

set histogram_type='JSON_HB';
set histogram_size=50;
--disable_result_log
ANALYZE TABLE Country, City, CountryLanguage persistent for all;
--enable_result_log

SELECT column_name, min_value, max_value, hist_size, hist_type, histogram FROM mysql.column_stats;
analyze select * from Country use index () where Code between 'BBC' and 'GGG';
analyze select * from Country use index () where Code < 'BBC';

set histogram_type=@save_histogram_type;
set histogram_size=@save_histogram_size;

DROP SCHEMA world;
use test;

create table t10 (
  a varchar(10)
);

--echo #
--echo # Histograms are not collected for empty tables:
--echo #
analyze table t10 persistent for all;
select histogram
from mysql.column_stats where table_name='t10' and db_name=database();

--echo #
--echo # Try with n_buckets > n_rows
--echo #
insert into t10 values ('Berlin'),('Paris'),('Rome');
set histogram_size=10, histogram_type='json_hb';
analyze table t10 persistent for all;
select histogram
from mysql.column_stats where table_name='t10' and db_name=database();
drop table t10;

--echo #
--echo #  MDEV-26590: Stack smashing/buffer overflow in Histogram_json_hb::parse upon UPDATE on table with long VARCHAR
--echo #

CREATE TABLE t1 (b INT, a VARCHAR(3176));
INSERT INTO t1 VALUES (1,'foo'),(2,'bar');
SET histogram_type= JSON_HB;
ANALYZE TABLE t1 PERSISTENT FOR ALL;
SELECT * FROM t1;
drop table t1;