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MDEV-24726 Assertion `0' failed in Field_varstring_compressed::key_cmp

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Compressed fields cannot have keys and therefore we are not adding
keys in derived preparation.
This commit is contained in:
Aleksey Midenkov 2025-01-09 17:11:19 +03:00
parent 12da35d644
commit d1bfea2254
3 changed files with 47 additions and 1 deletions
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21
mysql-test/main/column_compression.result
View file

@ -2978,4 +2978,25 @@ SELECT GROUP_CONCAT( b, a ORDER BY 2 ) AS f FROM t1;
f
nc,mmmmmmmmmmd
DROP TABLE t1;
#
# MDEV-24726 Assertion `0' failed in Field_varstring_compressed::key_cmp
#
CREATE TABLE t1 (a VARCHAR(8) COMPRESSED) CHARACTER SET utf8mb4;
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
INSERT INTO t1 VALUES ('foo'),('bar'),('foo');
SELECT * FROM v1 WHERE a IN (SELECT a FROM t1);
a
foo
bar
foo
DROP VIEW v1;
DROP TABLE t1;
CREATE TABLE t1 (f1 VARCHAR(8)) CHARSET=eucjpms COLLATE=eucjpms_nopad_bin;
INSERT INTO t1 VALUES ('');
CREATE TABLE t2 (f2 VARCHAR(8) COMPRESSED) CHARSET=eucjpms COLLATE=eucjpms_nopad_bin;
INSERT INTO t2 VALUES ('a'),('b');
SELECT t1.* FROM t1 LEFT JOIN (SELECT DISTINCT f2 FROM t2) sq ON sq.f2 = t1.f1;
f1
DROP TABLE t1, t2;
# End of 10.5 tests

23
mysql-test/main/column_compression.test
View file

@ -517,4 +517,27 @@ INSERT INTO t1 VALUES ('c','n'),('d','mmmmmmmmmm');
SELECT GROUP_CONCAT( b, a ORDER BY 2 ) AS f FROM t1;
DROP TABLE t1;
--echo #
--echo # MDEV-24726 Assertion `0' failed in Field_varstring_compressed::key_cmp
--echo #
CREATE TABLE t1 (a VARCHAR(8) COMPRESSED) CHARACTER SET utf8mb4;
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
INSERT INTO t1 VALUES ('foo'),('bar'),('foo');
SELECT * FROM v1 WHERE a IN (SELECT a FROM t1);
# Cleanup
DROP VIEW v1;
DROP TABLE t1;
CREATE TABLE t1 (f1 VARCHAR(8)) CHARSET=eucjpms COLLATE=eucjpms_nopad_bin;
INSERT INTO t1 VALUES ('');
CREATE TABLE t2 (f2 VARCHAR(8) COMPRESSED) CHARSET=eucjpms COLLATE=eucjpms_nopad_bin;
INSERT INTO t2 VALUES ('a'),('b');
SELECT t1.* FROM t1 LEFT JOIN (SELECT DISTINCT f2 FROM t2) sq ON sq.f2 = t1.f1;
# Cleanup
DROP TABLE t1, t2;
--echo # End of 10.5 tests

4
sql/sql_select.cc
View file

@ -6751,7 +6751,9 @@ add_key_part(DYNAMIC_ARRAY *keyuse_array, KEY_FIELD *key_field)
}
}
}
if (field->hash_join_is_possible() &&
/* Compressed fields can't have keys (see Field_varstring_compressed::key_cmp()). */
if (!field->compression_method() &&
field->hash_join_is_possible() &&
(key_field->optimize & KEY_OPTIMIZE_EQ) &&
key_field->val->used_tables())
{