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MDEV-18304 sql_safe_updates does not work with OR clauses

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not every index-using plan sets bits in table->quick_keys.
QUICK_ROR_INTERSECT_SELECT, for example, doesn't.

Use the fact that select->quick is set instead.

Also allow EXPLAIN to work.
This commit is contained in:
Sergei Golubchik
2021-10-12 18:34:51 +02:00
parent dc680d2119
commit 6789f2cfab
4 changed files with 52 additions and 7 deletions
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24
mysql-test/main/sql_safe_updates.result
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@ -1,3 +1,27 @@
#
# MDEV-14429 sql_safe_updates in my.cnf not work
#
select @@sql_safe_updates;
@@sql_safe_updates
1
#
# MDEV-18304 sql_safe_updates does not work with OR clauses
#
create table t1 (a int, b int, primary key (a), key (b));
update t1 set b=2 where a=1 or b=2;
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
explain update t1 set b=2 where a=1 or b=2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 1 Using where
delete from t1 where a=1 or b=2;
ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
explain delete from t1 where a=1 or b=2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 1 Using where
insert into t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8);
update t1 set b=2 where a=1 or b=2;
delete from t1 where a=1 or b=2;
drop table t1;
#
# End of 10.3 tests
#