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MDEV-26546 SIGSEGV's in spider_db_connect on SHOW TABLE and spider_db… …_mbase::connect (and SIGSEGV's in check_vcol_forward_refs and inline_mysql_mutex_lock)

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Not the SPIDER issue - happens to INSERT DELAYED.
the field::make_new_field does't copy the LONG_UNIQUE_HASH_FIELD
flag to the new field. Though the Delayed_insert::get_local_table
copies the field->vcol_info for this field. Ad a result
the parse_vcol_defs doesn't create the expression for that column
so the field->vcol_info->expr is NULL. Which leads to crash.
Backported fix for this from 10.5 - the flagg added in the
Delayed_insert::get_local_table.

Another problem with the USING HASH key is thst the
parse_vcol_defs modifies the table->keys content. Then the same
parse_vcol_defs is called on the table copy that has keys already
modified. Backported fix for that from 10.5 - key copying added
tot the Delayed_insert::get_local_table.

Finally - the created copy has to clear the expr_arena as
this table is not in the thd->open_tables list so won't be
cleared automatically.
This commit is contained in:
Alexey Botchkov 2022-07-16 16:54:03 +04:00
commit 8911823f65
6 changed files with 83 additions and 1 deletions
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9
mysql-test/main/delayed.result
View file

@ -510,3 +510,12 @@ a b
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drop table t1;
#
# MDEV-26546 SIGSEGV's in spider_db_connect on SHOW TABLE and
# spider_db_mbase::connect (and SIGSEGV's in check_vcol_forward_refs
# and inline_mysql_mutex_lock)
#
CREATE TABLE t1 (c0 INT,UNIQUE (c0) USING HASH) ENGINE=MYISAM;
INSERT DELAYED INTO t1 VALUES (0);
INSERT DELAYED INTO t1 VALUES (0);
DROP TABLE t1;