When looking for the execution plan of a derived table to be materialized
JOIN::optimize finds  out that all joined tables of the derived table
contain not more than one row then the derived table should be maretialized
at the optimization stage.
Added a test case for the bug.
Adjusted results in other test cases.

'derived_merge':
  - if the flag is off then all derived tables are materialized
  - if the flag is on then mergeable derived tables are merged
'derived_with_keys':
  - if the flag is off then no keys are created for derived tables
  - if the flag is on then for any derived table a key to access 
    the derived table may be created.

Now by default both flags are on.
Later the default values for the flags will be off to comply with
the current behaviour of mysql-5.1. 

Uncommented previously commented out test case from parts.partition_repair_myisam
after having added an explicit requirement to materialize the derived
table used in the test case.  

 

Resolved all conflicts and failures.

Uncommented the failing test cases.

Commented out the failing test case from parts.partition_repair_myisam.test.
The test case has to be changed to bear the same semantics as before mwl106.
 

- make sp.test work both with and without query_cache (attempt 2)
- fix compile warning in make_sort_key(), as directed by SergeiG

to be optimizer_switch flags mrr=on|off and mrr_cost_based=on|off.

- Don't attempt to construct FirstMatch access method if we've 
  just figured three lines above that it can't be used (because join
  prefix doesn't have the needed tables), and so have set 
    pos->first_firstmatch_table= MAX_TABLES 
  Attempts to analyze join->positions[MAX_TABLES] caused valgrind warnings

sql/sql_base.cc:
  Column for views should be looked in views (not in underlying table)
sql/sql_parse.cc:
  if we reread grants for single table we should read both database and tables grants for views (not only database grants).

Corrected the code from the patch for  LP bug 702322.

There is a potential race when we stop the slave. It may take some time for
the master to detect that the slave connection is closed (eg. if scheduling
delays the TCP RSET packet or whatever). Since we inject only a single corrupt
binlog event, we may be unfortunate enough to inject it on the wrong
connection, to a slave io thread that's already stopped.

Fix by waiting for the old dump thread on the master to go away before
injecting the corrupt event.

sql/sql_expression_cache.cc:
  The call should not open the temporary table. It will be done later after its index creation.

- Remove garbage comments

introduced at the latest merge 5.1->5.2->5.3.
It is basically not needed since if SQL_SELECT::pre_idx_push_select_cond 
is not NULL then SQL_SELECT::original_cond would point to the same condition
as SQL_SELECT::pre_idx_push_select_cond. Otherwise SQL_SELECT::original_cond
would be equal to SQL_SELECT::cond.

The fix blocks execution of any constant sub-expressions of
the defining expressions for virtual columns when context
analysis if these expressions is performed.

Fixed a compiler warning.

- Code cleanup: remove garbage comments

- Don't call table_list->process_index_hints() for JTBM pseudo-tables
- Update test results

- bad .result merge
- make .test file do not switch off both materialization and IN->EXISTS as that leads to error now.

- Update test results (checked)
- Fix compiler warning

way of processing prepared statements:
- conversion subquery_predicate -> TABLE_LIST is once per-statement
- However, the code must take into account that materialized temptable
  is dropped and re-created on each execution (the tricky part is that 
  at start of n-th EXECUTE we have TABLE_LIST object but not its TABLE object)
- IN-equality is injected into WHERE on every execution.

Also, change windows timespec definition to be Unix-ish - simplifies handling a lot.

A lot of small fixes and new test cases.

client/mysqlbinlog.cc:
  Cast removed
client/mysqltest.cc:
  Added missing DBUG_RETURN
include/my_pthread.h:
  set_timespec_time_nsec() now only takes one argument
mysql-test/t/date_formats.test:
  Remove --disable_ps_protocl as now also ps supports microseconds
mysys/my_uuid.c:
  Changed to use my_interval_timer() instead of my_getsystime()
mysys/waiting_threads.c:
  Changed to use my_hrtime()
sql/field.h:
  Added bool special_const_compare() for fields that may convert values before compare (like year)
sql/field_conv.cc:
  Added test to get optimal copying of identical temporal values.
sql/item.cc:
  Return that item_int is equal if it's positive, even if unsigned flag is different.
  Fixed Item_cache_str::save_in_field() to have identical null check as other similar functions
  Added proper NULL check to Item_cache_int::save_in_field()
sql/item_cmpfunc.cc:
  Don't call convert_constant_item() if there is nothing that is worth converting.
  Simplified test when years should be converted
sql/item_sum.cc:
  Mark cache values in Item_sum_hybrid as not constants to ensure they are not replaced by other cache values in compare_datetime()
sql/item_timefunc.cc:
  Changed sec_to_time() to take a my_decimal argument to ensure we don't loose any sub seconds.
  Added Item_temporal_func::get_time() (This simplifies some things)
sql/mysql_priv.h:
  Added Lazy_string_decimal()
sql/mysqld.cc:
  Added my_decimal constants max_seconds_for_time_type, time_second_part_factor
sql/table.cc:
  Changed expr_arena to be of type CONVENTIONAL_EXECUTION to ensure that we don't loose any items that are created by fix_fields()
sql/tztime.cc:
  TIME_to_gmt_sec() now sets *in_dst_time_gap in case of errors
  This is needed to be able to detect if timestamp is 0
storage/maria/lockman.c:
  Changed from my_getsystime() to set_timespec_time_nsec()
storage/maria/ma_loghandler.c:
  Changed from my_getsystime() to my_hrtime()
storage/maria/ma_recovery.c:
  Changed from my_getsystime() to mmicrosecond_interval_timer()
storage/maria/unittest/trnman-t.c:
  Changed from my_getsystime() to mmicrosecond_interval_timer()
storage/xtradb/handler/ha_innodb.cc:
  Added support for new time,datetime and timestamp
unittest/mysys/thr_template.c:
  my_getsystime() -> my_interval_timer()
unittest/mysys/waiting_threads-t.c:
  my_getsystime() -> my_interval_timer()