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Fix column range cardinality crash when histogram is null

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Signed-off-by: Michael Okoko <okokomichaels@outlook.com>
This commit is contained in:
Michael Okoko
2021-08-22 17:31:44 +01:00
committed by Sergei Petrunia
parent 058a90e6f5
commit 096995b106
3 changed files with 43 additions and 22 deletions
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4
mysql-test/main/statistics_json.result
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@@ -2441,7 +2441,7 @@ Warnings:
Note 1003 select `test`.`t1_json`.`a` AS `a` from `test`.`t1_json` where `test`.`t1_json`.`a` < 'b-1a'
analyze select * from t1_json where a > 'zzzzzzzzz';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 10.00 0.00 Using where
1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 0.00 0.00 Using where
UPDATE mysql.column_stats SET histogram='["a-1", "a-2", {"a": "b"}, "a-3"]' WHERE table_name='t1_json';
FLUSH TABLES;
explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz';
@@ -2475,7 +2475,7 @@ id select_type table type possible_keys key key_len ref rows r_rows filtered r_f
1 SIMPLE users ALL NULL NULL NULL NULL 101 101.00 2.00 1.98 Using where
explain extended select * from users where city < 'Lagos';
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE users ALL NULL NULL NULL NULL 101 50.00 Using where
1 SIMPLE users ALL NULL NULL NULL NULL 101 3.58 Using where
Warnings:
Note 1003 select `test`.`users`.`city` AS `city` from `test`.`users` where `test`.`users`.`city` < 'Lagos'
drop table t1_bin;