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MDEV-34580: Assertion `(key_part->key_part_flag & 4) == 0' failed key_hashnr

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Remove an assert added by fix for MDEV-34417. BNL-H join can be used with
prefix keys. This happens when there are real prefix indexes on the
equi-join columns (although it probably doesn't make a lot of sense).

Anyway, remove the assert. The code receives properly truncated key values
for hashing/comparison so it can handle them just fine.
This commit is contained in:
Sergei Petrunia
2024-07-30 17:49:09 +03:00
parent c038b3c05e
commit fdda8171b2
3 changed files with 50 additions and 6 deletions
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20
mysql-test/main/join_cache.result
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@ -6420,3 +6420,23 @@ DROP TABLE t1,t2,t3;
#
# End of 10.4 tests
#
#
# MDEV-34580: Assertion `(key_part->key_part_flag & 4) == 0' failed key_hashnr
#
SET join_cache_level=3;
CREATE TABLE t1 ( a TIMESTAMP , b varchar(100), c varchar(10) ) ;
INSERT INTO t1 (b,c) VALUES ('GHOBS','EMLCG'),('t','p');
CREATE TABLE t2 (a varchar(100), b varchar(100), c varchar(10) , KEY b (b(66))) ;
insert into t2 select seq, seq, seq from seq_1_to_20;
explain
SELECT t1.a FROM t1 JOIN t2 ON t1.b = t2.b ;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
1 SIMPLE t2 hash_ALL b #hash#b 69 test.t1.b 20 Using where; Using join buffer (flat, BNLH join)
SELECT t1.a FROM t1 JOIN t2 ON t1.b = t2.b ;
a
set join_cache_level=default;
DROP TABLE t1, t2;
#
# End of 10.5 tests
#