Vers SQL: TRT fix getting TRX_ID by COMMIT_TS
Fixed wrong assumption that records are ordered by COMMIT_TS.
This is anyway a quick hack until tempesta-tech#314 is done.
See also FIXME and TODO in TR_table::query(MYSQL_TIME, bool).
Test: SEES case for trx_id.test [closes#456]
Lots of changes:
* calculate the current history partition in ::external_lock(),
not in ::write_row() or ::update_row()
* remove dynamically collected per-partition row_end stats
* no full table scan in open_table_from_share to calculate these
stats, no manual MDL/thr_locks in open_table_from_share
* no shared stats in TABLE_SHARE = no mutexes or condition waits when
calculating current history partition
* always compare timestamps, don't convert them to MYSQL_TIME
(avoid DST ambiguity, and it's faster too)
* correct interval handling, 1 month = 1 month, not 30 * 24 * 3600 seconds
* save/restore first partition start time, and count intervals from there
* only allow to drop first partitions if INTERVAL
* when adding new history partitions, split the data in the last history
parition, if it was overflowed
* show partition boundaries in INFORMATION_SCHEMA.PARTITIONS
partition_info had a bunch of function pointers to avoid if()'s
when invoking part_type specific functionality (like get_part_id, etc).
But check_range_constants() and check_list_constants() were still
invoked conditionally, with if()'s.
Create partition_info::check_constants function pointer, get rid
of if()'s
Also remove alloc argument of check_range_constants(), added
in 26a3ff0a22. Broken system versioning will be fixed in
following commits.
use include/have_xxx.inc when some feature needs to be present
(because --xxx in the opt file will fail if the xxx is not compiled in)
set variables in the test, not on the command line, to avoid unnecessary
server restarts (they're must slower than SET).
There is only one lock_sys. Allocate it statically in order to avoid
dereferencing a pointer whenever accessing it. Also, align some
members to their own cache line in order to avoid false sharing.
lock_sys_t::create(): The deferred constructor.
lock_sys_t::close(): The early destructor.
is not supported
Allowed to use recursive references in derived tables.
As a result usage of recursive references in operands of
INTERSECT / EXCEPT is now supported.
There is only one purge_sys. Allocate it statically in order to avoid
dereferencing a pointer whenever accessing it. Also, align some
members to their own cache line in order to avoid false sharing.
purge_sys_t::create(): The deferred constructor.
purge_sys_t::close(): The early destructor.
undo::Truncate::create(): The deferred constructor.
Because purge_sys.undo_trunc is constructed before the start-up
parameters are parsed, the normal constructor would copy a
wrong value of srv_purge_rseg_truncate_frequency.
TrxUndoRsegsIterator: Do not forward-declare an inline constructor,
because the static construction of purge_sys.rseg_iter would not have
access to it.
trx_purge(): Remove the parameter limit or batch_size, which is
always passed as srv_purge_batch_size.
trx_purge_attach_undo_recs(): Remove the parameters purge_sys, batch_size.
Refer to srv_purge_batch_size.
trx_purge_wait_for_workers_to_complete(): Remove the parameter purge_sys.
