Do not assert, but print diagnostics if MySQL tries to free a trx where n_mysql_tables_in_use > 0

until it has been comprehensive tested.

  Fix wrong spelling

  Make InnoDB-5.0.3 to process log records of 4.1 undo log header create and reuse just like in 4.1; storing XID to the start of the undo log is a separately logged operation; this conforms to Rule 3 of InnoDB redo logging

  Disable the XA code in InnoDB crash recovery; when Jan and Sergei want to test XA, they should revert this patch

by adding #ifndef UNIV_HOTBACKUP and adjusting some function
declarations.

  Fix InnoDB critical bug #7496; we scan the InnoDB data dictionary also at a normal mysqld startup, and create the spaces, so that we know the mapping space id -> .ibd file name; fix an infinite loop if DISCARD TABLESPACE coincides with INSERT or some other table operation; fix a potential crash if DISCARD TABLESPACE coincides with a cascaded FOREIGN KEY operation in the same table; do not allow DISCARD TABLESPACE of a referenced table if FOREIGN_KEY_CHECKS=1

transactional table locks to tables mentioned in the query. These locks
are released at the end of the transaction automatically.
This is fix for bugs #5655, #5998 and issue #3762.

Disable log archiving code unless #ifdef UNIV_LOG_ARCHIVE
Remove (char*) casts of string constants; add const qualifiers
Remove some Hot Backup code unless #ifdef UNIV_HOTBACKUP

Reserve the MySQL LOCK_thread_count mutex when printing thd->query of
an arbitrary transaction; if we are printing thd->query of a transaction that
we know is currently executing inside InnoDB, then we know that MySQL cannot
meanwhile change thd->query, and no need to reserve the MySQL mutex; note
that this patch still leaves open the possibility of races in MySQL's
thd->query_len

instead of stdout or fixed-size memory buffers

  Update an obsolete comment about trx commit: we can no longer call trx_undo_update_cleanup_by_discard(), and actually, the idea to call it was erroneous, it cannot work

  Removed unused code
.del-os0trash.c~8cae5c1695501117:
  Delete: innobase/os/os0trash.c
dict0crea.c:
  Protect all sprintf(%s) with assertions

A after merge fix for last merge

  Multiple tablespaces for InnoDB
sql_table.cc:
  Tell explicitly that InnoDB should retrieve all columns in CHECKSUM TABLE
sql_update.cc, sql_select.cc, my_base.h:
  More descriptive flag name HA_EXTRA_RETRIEVE_ALL_COLS

  Merge
trx0trx.c:
  Print more info about a trx in SHOW INNODB status; try to find the bug reported by Plaxo
buf0buf.c:
  Check that page log sequence numbers are not in the future
log0recv.c, log0log.c:
  Fixed a bug: if you used big BLOBs, and your log files were relatively small, InnoDB could in a big BLOB operation temporarily write over the log produced AFTER the latest checkpoint. If InnoDB would crash at that moment, then the crash recovery would fail, because InnoDB would not be able to scan the log even up to the latest checkpoint. Starting from this version, InnoDB tries to ensure the latest checkpoint is young enough. If that is not possible, InnoDB prints a warning to the .err log

  A cosmetic change: set trx id to zero at creation so that SHOW INNODB STATUS does not print a random value for the id of a transaction object for which the transaction has never been started yet (for example, running SHOW INNODB STATUS as the first command from a mysql prompt printed a random id for the trx object associated with the session itself running the SHOW INNODB STATUS command)

  Remove potential starvation of a full log buffer flush: only flush up to the lsn which was the largest at the time when we requested the full log buffer flush
os0sync.h, os0sync.c:
  Fix a bug in os_event on Unix: even though we signaled the event, some threads could continue waiting if the event became nonsignaled quickly again; this made group commit less efficient than it should be

  Fix bug: group commit still did not work when we had MySQL binlogging on

  Merge InnoDB-4.0.14: SAVEPOINT now implemented; InnoDB now accepts also column prefix keys; crashing bug in ON UPDATE CASCADE fixed; page checksum formula fixed

  Search first only 10 % of the LRU list for a replaceable block before doing an LRU flush; enable again flushing of close pages also in a flush list (checkpointing) flush
trx0trx.c:
  Add forgotten return value (it was not used anywhere, fortunately)
ha_innodb.h, mysql_priv.h:
  Move declaration of srv_buf_pool_max_modified_pct to ha_innodb.h and enclose it to denote it is a C variable, not C++

  Eliminate the LOCK_log bottleneck in group commit in binlogging: flush InnoDB log files only after it has been released

  Remove code never actually used in IGNORE; InnoDB just rolls back the latest row insert or update on a duplicate key error and leaves it for MySQL to decide whether to ignore the error

  Print also the thread ids in SHOW INNODB STATUS also in Linux

  Add diagnostic prints to determine why the 'queries inside InnoDB' might drift upwards
ha_innodb.cc:
  Add more print space to SHOW INNODB STATUS; remove possible memory leak in case there is an error

  Reduce memory usage of the buffer headers
Many files:
  Merge InnoDB-4.1 with AWE support