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MDEV-15738 Server crashes in my_strcasecmp_utf8 on query from I_S with UNION executed as PS

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Problem was the Item_field::Item_field(THD*, Field*) had old code
that put a null pointer in orig_field_names. Now, when we have
proper re-prepare if table definition changes, this is not needed
anymore.
This commit is contained in:
Michael Widenius
2018-04-05 13:50:12 +03:00
parent 30f692f016
commit 1d7b4c2689
3 changed files with 97 additions and 6 deletions
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42
mysql-test/main/prepare.test Normal file
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#
# MDEV-15738 Server crashes in my_strcasecmp_utf8 on query from I_S with UNION
# executed as PS
#
PREPARE stmt1 FROM "
SELECT table_name FROM information_schema.tables
WHERE table_name = 't1_first'
UNION ALL
SELECT table_name FROM information_schema.tables
WHERE table_name = 't1_second'";
execute stmt1;
execute stmt1;
create or replace table t1 (a int primary key, table_name char(40));
insert into t1 values(1,"t1_first");
insert into t1 values(2,"t1_second");
PREPARE stmt2 FROM "
SELECT table_name FROM t1
WHERE table_name = 't1_first'
UNION ALL
SELECT table_name FROM t1
WHERE table_name = 't1_second'";
execute stmt2;
execute stmt2;
flush tables;
execute stmt2;
alter table t1 add column b int;
execute stmt2;
execute stmt2;
drop table t1;
--error ER_NO_SUCH_TABLE
execute stmt2;
create or replace table t1 (a int primary key, table_name char(40));
insert into t1 values(1,"t1_first");
execute stmt2;
deallocate prepare stmt1;
deallocate prepare stmt2;
drop table t1;