Some tests drop the default mtr database "test". This may fail due
to the directory not being empty. InnoDB may not delete all tables
immediately, due to the "background drop table queue" or its
replacement in commit 1bd681c8b3
(the purge of history would clean up after a DDL operation during
which the server was killed).
Let us try to avoid "drop database test" whenever it is easily possible.
Where it is not, SET GLOBAL innodb_max_purge_lag_wait=0 will ensure
that the replacement of the "background drop table queue" will have
completed its job.
The problem is that if table definition cache (TDC) is full of real tables
which are in tables cache, view definition can not stay there so will be
removed by its own underlying tables.
In situation above old mechanism of detection matching definition in PS
and current version always require reprepare and so prevent executing
the PS.
One work around is to increase TDC, other - improve version check for
views/triggers (which is done here). Now in suspicious cases we check:
- timestamp (microseconds) of the view to be sure that version really
have changed;
- time (microseconds) of creation of a trigger related to time
(microseconds) of statement preparation.
1. For INSERT..SELECT statements: don't include table/view the data
is inserted into in the list of leaf tables
2. Remove duplicated and dead code related to table_count
This bug caused crashes when the server executed such a CREATE VIEW
statement whose view specification contained a reference to an unknown
column in a subquery used in ON condition.
The cause of this bug is quite similar to the cause of the bug MDEV-26412.
The fix of this bug is quite similar to the fix for MDEV-26412.
Approved by Sergey Petrunia <sergey@mariadb.com>
This bug could affect prepared statements for the command CREATE VIEW with
specification that contained unnamed basic constant in select list. If
generation of a valid name for the corresponding view column required
resolution of conflicts with names of other columns that were explicitly
defined then execution of such prepared statement and following deallocation
of this statement led to reading from freed memory.
Approved by Oleksandr Byelkin <sanja@mariadb.com>
in ON condition
The fix of the bug MDEV-25002 for 10.4 turned out to be incomplete. It
caused crashes when executing CREATE VIEW, CREATE TABLE .. SELECT,
INSERT .. SELECT statements if their SELECTs contained references to
non-existing fields.
This patch complements the fix for MDEV-25002 in order to avoid such
crashes.
Approved by Oleksandr Byelkin <sanja@mariadb.com>
- Produce a "Note" for all wrongly dropped objects
(Like doing DROP VIEW on a table).
- IF EXISTS ends with a list of all not existing objects, instead of a
separate note for every not existing object.
Other things:
- Fixed bug where one could do CREATE TEMPORARY SEQUENCE multiple times
and create multiple temporary sequences with the same name.
In main.index_merge_myisam we remove the test that was added in
commit a2d24def8c because
it duplicates the test case that was added in
commit 5af12e4635.
