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MDEV-21245 InnoDB: Using a partial-field key prefix in search

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ha_innobase::compare_key_parts(): If a full column index is
being replaced with a column prefix index, return Compare_keys::NotEqual.
This commit is contained in:
Marko Mäkelä
2023-12-13 15:40:29 +02:00
committed by Daniel Black
parent b4712242dd
commit 852e1383e3
3 changed files with 34 additions and 0 deletions
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16
mysql-test/suite/innodb/r/innodb_prefix_index_restart_server.result
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@@ -90,3 +90,19 @@ worklog5743;
col_1_text = REPEAT("a", 3500) col_2_text = REPEAT("o", 3500)
1 1
DROP TABLE worklog5743;
#
# MDEV-21245 InnoDB: Using a partial-field key prefix in search
#
CREATE TABLE t1 (a VARCHAR(255), KEY k(a)) DEFAULT CHARSET=utf8mb3
ENGINE=InnoDB;
INSERT INTO t1 set a='';
alter table t1 change a a varchar(3000);
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 1
Warnings:
Note 1071 Specified key was too long; max key length is 3072 bytes
SELECT * FROM t1 WHERE a IN ('');
a
DROP TABLE t1;
# End of 10.4 tests