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MDEV-22719 Long unique keys are not created when individual key_part->length < max_key_length but SUM(key_parts->length) > max_key_length

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Make UNIQUE HASH key in case when key_info->key_length > max_key_length
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Sachin 2020-06-03 13:36:36 +05:30
commit eb14e073ea
3 changed files with 25 additions and 0 deletions
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11
mysql-test/main/long_unique_bugs.result
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@ -277,3 +277,14 @@ create table t2(id int primary key, a blob, b varchar(20) as (LEFT(a,2)));
INSERT INTO t2 VALUES (1, 'foo', default);
DROP TABLE t1, t2;
SET binlog_row_image= FULL;
CREATE TABLE t1 (a int, b VARCHAR(1000), UNIQUE (a,b)) ENGINE=MyISAM;
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 0 a 1 a A NULL NULL NULL YES HASH
t1 0 a 2 b A NULL NULL NULL YES HASH
CREATE TABLE t2 (a varchar(900), b VARCHAR(900), UNIQUE (a,b)) ENGINE=MyISAM;
show index from t2;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t2 0 a 1 a A NULL NULL NULL YES HASH
t2 0 a 2 b A NULL NULL NULL YES HASH
DROP TABLE t1,t2;