No commit message

This does not fix the bug. It only disables the failing test.

If the server failed to expired log files during start up it could crash.

      
the reason for the failure is that io thread passes through a sequence of state
changes before it eventually got stuck at the expect running state as NO.
It's unreasonble to wait for the running status while the whole idea of the test is
to get to the IO thread error.

Fixed with changing the waiting condition.

- Revert the fix for bug 33812
- fixed a win32 warning

Problem: missing initialization, if the previous test
fails leaving table t1, client_xml fails as well.
Fix: adding initialization.

Many dump threads can exist due to a way the new version of mtr governs suites.

For this immediate problem the test is refined not to use I_S but rather to reconnect
explicitly with preserving logics of a an old target bug fixes verification.

Don't initalize federated if it's disabled by a command line option.

Reverting the previous patch

            
Range scan in descending order for c <= <col> <= c type of
ranges was ignoring the DESC flag.
However some engines like InnoDB have the primary key parts 
as a suffix for every secondary key.
When such primary key suffix is used for ordering ignoring 
the DESC is not valid.
But we generally would like to do this because it's faster.
      
Fixed by performing only reverse scan if the primary key is used.
Removed some dead code in the process.

- In QUICK_INDEX_MERGE_SELECT::read_keys_and_merge: when we got table->sort from Unique,
  tell init_read_record() not to use rr_from_cache() because a) rowids are already sorted
  and b) it might be that the the data is used by filesort(), which will need record rowids
  (which rr_from_cache() cannot provide).
- Fully de-initialize the table->sort read in QUICK_INDEX_MERGE_SELECT::get_next(). This fixes BUG#35477.
(bk trigger: file as fix for BUG#35478).

Note: item->null_value is not updated before a call to
item->store(), item->is_null() is not too (in common case).

mysqltest disconnect/connect-combo could be so
quick that connect would hit the server before
it had processed the disconnect. Since that
resulted in one more concurrent connection than
we meant to have, global or per-user
max-user-connections could be exceeded.
This could lead to "random" failures in tests
that set those limits.

build)

The crash was caused by freeing the internal parser stack during the parser
execution.
This occured only for complex stored procedures, after reallocating the parser
stack using my_yyoverflow(), with the following C call stack:
- MYSQLparse()
- any rule calling sp_head::restore_lex()
- lex_end()
- x_free(lex->yacc_yyss), xfree(lex->yacc_yyvs)

The root cause is the implementation of stored procedures, which breaks the
assumption from 4.1 that there is only one LEX structure per parser call.

The solution is to separate the LEX structure into:
- attributes that represent a statement (the current LEX structure),
- attributes that relate to the syntax parser itself (Yacc_state),
so that parsing multiple statements in stored programs can create multiple
LEX structures while not changing the unique Yacc_state.

Now, Yacc_state and the existing Lex_input_stream are aggregated into
Parser_state, a structure that represent the complete state of the (Lexical +
Syntax) parser.