Made information_schema_all_engines stable by adding "sorted_result".

mysql-test/r/partition.result:
  Added test case
mysql-test/t/partition.test:
  Added test case
sql/ha_partition.cc:
  Removed printing of not initialized variable
storage/maria/ha_maria.cc:
  Don't copy variables that are not initialized

storage/maria/ma_test2.c:
  Problem was that rnd() generated bigger value than allocated array

Empty result after reading const tables now works for subqueries.

Check ability of index to be NULL as it made in MyISAM. UNIQUE with NULL could have several NULL entries so we have to continue even if ve have found a row.

 - Fix some warnings in newer GCC (-Werror ...).
 - Fix wrong STACK_DIRECTION detected by configure due to compiler inlining.

Analysis:
The queries in question use the [unique | index]_subquery execution methods.
These methods reuse the ref keys constructed by create_ref_for_key(). The
way create_ref_for_key() works is that it doesn't store in ref.key_copy[]
store_key elements that represent constants. In particular it doesn't store
the store_key for NULL constants.

The execution of [unique | index]_subquery calls
subselect_uniquesubquery_engine::copy_ref_key, which in addition to copy
the left IN argument into a index lookup key, is supposed to detect if
the left IN argument contains NULLs. Since the store_key for the NULL
constant is not copied into the key array, the null is not detected, and
execution erroneously proceeds as if it should look for a complete match.

Solution:
The solution (unlike MySQL) is to reuse already computed information about
NULL presence. Item_in_optimizer::val_int already finds out if the left IN
operand contains NULLs. The fix propagates this to the execution methods
subselect_[unique | index]subquery_engine::exec so it knows if there were
NULL values independent of the presence of keys.

In addition the patch siplifies copy_ref_key() and the logic that hanldes
the case of NULLs in the left IN operand.

In fill_schema_table_by_open(): free item list before restoring active arena.


sql/sql_show.cc:
  Replaced i_s_arena.free_items with DBUG_ASSERT(i_s_arena.free_list == NULL)
  (there's nothing to free in that list)

No commit message

THOUGH IT IS NOT.

The following error message is misleading because it claims 
that the BLOB space is not counted.  

"ERROR 1118 (42000): Row size too large. The maximum row size for 
the used table type, not counting BLOBs, is 8126. You have to 
change some columns to TEXT or BLOBs"

When the ROW_FORMAT=compact or ROW_FORMAT=REDUNDANT is used,
the BLOB prefix is stored inline along with the row.  So 
the above error message is changed as follows depending on
the row format used:

For ROW_FORMAT=COMPRESSED or ROW_FORMAT=DYNAMIC, the error
message is as follows:

"ERROR 42000: Row size too large (> 8126). Changing some
columns to TEXT or BLOB may help. In current row format, 
BLOB prefix of 0 bytes is stored inline."

For ROW_FORMAT=COMPACT or ROW_FORMAT=REDUNDANT, the error
message is as follows:

"ERROR 42000: Row size too large (> 8126). Changing some
columns to TEXT or BLOB or using ROW_FORMAT=DYNAMIC or 
ROW_FORMAT=COMPRESSED may help. In current row
format, BLOB prefix of 768 bytes is stored inline."

rb://1252 approved by Marko Makela

No commit message

PAGE SPLIT

page_rec_get_nth_const(): Map nth==0 to the page infimum.

btr_compress(adjust=TRUE): Add a debug assertion for nth>0. The cursor
should never be positioned on the page infimum.

btr_index_page_validate(): Add test instrumentation for checking the
return values of page_rec_get_nth_const() during CHECK TABLE, and for
checking that the page directory slot 0 always contains only one
record, the predefined page infimum record.

page_cur_delete_rec(), page_delete_rec_list_end(): Add debug
assertions guarding against accessing the page slot 0.

page_copy_rec_list_start(): Clarify a comment about ret_pos==0.

rb:1248 approved by Jimmy Yang

ha_innodb::records_in_range(): Remove a debug assertion
that prohibits an open range (full table).

The patch by Jorgen Loland only removed the assertion from the
built-in InnoDB, not from the InnoDB Plugin.

ha_innobase::records_in_range(): Remove a debug assertion
that prohibits an open range (full table).
This assertion catches unnecessary calls to this method, 
but such calls are not harming correctness.