when logging is enabled.
Currently the partition engine doesn't allow log tables to
be partitioned. But this was not checked and the server crashed.
Fixed by adding a check in ALTER TABLE to disable partitioning the
log tables.
While working on the cause of the problem improved the way the log
thread structures are initialized before opening the log tables.
Problem: getting an autoincrement value for a partition table in the ::info() method we call
the get_auto_increment() for all partitions. That may cause a problem for at least MyISAM
tables that rely on some table state (in this particular case table->naxt_nuber_field is
set to 0 in the mysql_insert() and we get a crash).
Moreover, calling get_auto_increment() is superfluous there.
Fix: use ::info(HA_STATUS_AUTO) calls to get autoincrement values for partitions instead of
get_auto_increment() ones in the ha_partition::info().
While executing ALTER TABLE ... PARTITION the server uses
a temporary "shadow" table to create the updated table.
This shadow table then gets renamed as the original table.
The shadow table was not prefixed with the special prefix that
marks temporary tables so it was picked up by SHOW TABLE STATUS.
Fixed by isolating the code to create the shadow table name in a
separate function and prefixing the shadow table name with the
special prefix to exclude it from the list of user tables.
See bug 18775 and WL1324 for details.
- The function build_table_filename() builds up a string unconditionally
using the forward slash as a path separator. Later, when the string is
searched for FN_LIBCHAR by the set_up_table_before_create() function, a
null pointer is returned that is finally used by strlen in the
append_file_to_dir() function which causes the crash.
record in table)
key_restore function didn't work as intended in the case of
VARCHAR or BLOB fields, stored the restored key in field->ptr instead
of to_record.
That produced the wrong key so search returned wrong result
creation of the partitioned table could fail as we created Item-s for
it's list function in thd->mem_root, and then do Item->fix_fields
in the context of other table->mem_root (so that memory alloced
there was alloced in this table->mem_root). As we freed the
table->mem_root before we do thd->free_items, our Item-s had
pointers to the freed memory, that caused the crash
Subselect's engine checks table->status field to determine if the
record was properly found when we use keyread upon the table.
Partition engine checks all the partitions for given key
before return. So if matching record was found in the first
partition and no matching records were found in the second,
we have table->status == NOT_FOUND after the function, what
makes subselects to skip matching records.
The patch adds table->status= 0 if we actually found something.
when REORGANIZE creates new partition, no_subparts for that partition
isn't set right (call handler::set_partitions_defaults always returns 1)
Normally the number of subpartitions should be inherited from the
table.
set_up_table_before_create can fail due to erroneus path to
data directory or index directory
Added abort handling to ensure created partitions are dropped
if a failure occurs in the middle of the create process.
