plugin_dir option backported from 5.1

mysql-test/r/udf.result:
  result fix
sql/mysql_priv.h:
  opt_plugin_dir and opt_plugin_dir_ptr declared.
sql/mysqld.cc:
  'plugin_dir' option added
sql/set_var.cc:
  'plugin_dir' option added.
sql/sql_udf.cc:
  opt_plugin_dir added to the udf->dl path. Warn if it's not specified.
sql/unireg.h:
  PLUGINDIR defined.

            
            test_if_data_home_dir fixed to look into real path.
            Checks added to mi_open for symlinks into data home directory.

per-file messages:
        include/my_sys.h
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          my_is_symlink interface added
        include/myisam.h
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          myisam_test_invalid_symlink interface added
        myisam/mi_check.c
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          mi_open_datafile calls modified
        myisam/mi_open.c
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          code added to mi_open to check for symlinks into data home directory.
          mi_open_datafile now accepts 'original' file path to check if it's
          an allowed symlink.
        myisam/mi_static.c
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          myisam_test_invlaid_symlink defined
        myisam/myisamchk.c
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          mi_open_datafile call modified
        myisam/myisamdef.h
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          mi_open_datafile interface modified - 'real_path' parameter added
        mysql-test/r/symlink.test
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          error codes corrected as some patch now rejected pointing inside datahome
        mysql-test/r/symlink.result
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          error messages corrected in the result
        mysys/my_symlink.c
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          my_is_symlink() implementsd
          my_realpath() now returns the 'realpath' even if a file isn't a symlink
        sql/mysql_priv.h
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          test_if_data_home_dir interface
        sql/mysqld.cc
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          myisam_test_invalid_symlik set with the 'test_if_data_home_dir'
        sql/sql_parse.cc
          Bug#32167 another privilege bypass with DATA/INDEX DIRECTORY.
          
          error messages corrected
          test_if_data_home_dir code fixed

mysql-test/r/join.result:
  result fix

add'l portability fixes

mysys/safemalloc.c:
  Make the various print-functions happy:
  sf_malloc_(cur|max)_memory are size_t now, might as well use %u instead
  of %d. Ideally, we'd use %zu, but we can't rely on having that, so we'll
  use %lu instead. Likewise, we could cast to unsigned for our poor man's
  %p -- pointers are never negative, and neither is %x --, but since it
  was fixed to %p with seemingly no ill effects in 6.0 anyway, we'll back
  port that instead.

portability fixes / cleanup

include/my_sys.h:
  declaration should certainly match definition!
mysys/safemalloc.c:
  Make the various print-functions happy:
  sf_malloc_(cur|max)_memory are size_t now, might as well use %u instead
  of %d. Ideally, we'd use %zu, but we can't rely on having that, so we'll
  use %lu instead. Likewise, we could cast to unsigned for our poor man's
  %p -- pointers are never negative, and neither is %x --, but since it
  was fixed to %p with seemingly no ill effects in 6.0 anyway, we'll back
  port that instead.

Bug#37531, Bug#36941, Bug#36941, Bug#36942, Bug#38185.

Also include test case from Bug 34300 which was left out from earlier snapshot
(5.1-ss2387).

Also include fix for Bug #29507, "TRUNCATE shows to many rows effected", since
the fix for Bug 37531 depends on it.

post push fix for bug#20129, test failed due to non existing
source files.

mysql-test/Makefile.am:
  Bug#20129: ALTER TABLE ... REPAIR PARTITION ... complains that
  partition is corrupt
  
  Test parts.partition_repair_myisam failed because the corrupted
  pre fabricated files was not included in the dist-file.
mysql-test/suite/parts/r/partition_special_innodb.result:
  Bug#34604: hander::ha_rnd_end(): Assertion inited==RND failed
  
  updated result file
mysql-test/suite/parts/t/partition_special_innodb-master.opt:
  Bug#34604: hander::ha_rnd_end(): Assertion inited==RND failed
  
  Added parameter to speed up the test.
  Set to 2 seconds to be working on slow machines.
mysql-test/suite/parts/t/partition_special_innodb.test:
  Bug#34604: hander::ha_rnd_end(): Assertion inited==RND failed
  
  Added test for verifying the bug (without the patch in
  ha_partition.cc, this crashes a debug compiled server)
sql/ha_partition.cc:
  Bug#34604: hander::ha_rnd_end(): Assertion inited==RND failed
  
  In some cases error was not properly propagated through
  ha_partition::rnd_next.
  
  Will now return the error code from the partitions rnd_next and
  update m_part_spec.start_part and m_last_part properly.
  This makes the inited state to be correct.

created at least some files and that they are correct.

Send_field.org_col_name has broken value on secondary execution.
It happens when result field is created from the field which belongs to view
due to forgotten assignment of some Send_field attributes. 
The fix:
set Send_field.org_col_name,org_table_name with correct value during Send_field intialization.

mysql-test/r/metadata.result:
  result fix
  The result file was changed because now forgotten attributes are properly set.
mysql-test/r/sp.result:
  test result
mysql-test/t/sp.test:
  test case
sql/item.cc:
  Send_field.org_col_name has broken value on secondary execution.
  It happens when result field is created from the field which belongs to view
  due to forgotten assignment of some Send_field attributes. 
  The fix:
  set Send_field.org_col_name,org_table_name with correct value during Send_field intialization.
tests/mysql_client_test.c:
  test case fix
  The test was changed because now forgotten attributes are properly set.

Bug #35602 "Failed to read auto-increment value from storage engine" with
Innodb

The test for REPLACE was an error of ommission since it's classified as
a simple INSERT. For REPLACE statements we don't acquire the special
AUTOINC lock for AUTOINC_NEW_STYLE_LOCKING with this fix.

Bug#36600 and Bug#36793:

Bug #36600 SHOW STATUS takes a lot of CPU in buf_get_latched_pages_number

Fix by removing the Innodb_buffer_pool_pages_latched variable from SHOW
STATUS output in non-UNIV_DEBUG compilation.

Bug #36793 rpl_innodb_bug28430 fails on Solaris

This is a back port from branches/zip. This code has been tested on a
big-endian machine too.

Bug #36278 Data_free in SHOW TABLE STATUS for InnoDB is in kilobytes

Change the fix for Bug 32440 to show bytes instead of kilobytes in
INFORMATION_SCHEMA.TABLES.DATA_FREE.

INSTALL PLUGIN and UNINSTALL PLUGIN worked with statement-based and
mixed-mode replication only, but not with row-based replication.

There is no statement-based replication of these statements.
But there was row-based replication of the inserts and deletes
to and from the mysql.plugin table.

The fix is to suppress binlogging during insert and delete to
and from the mysql.plugin table.


mysql-test/suite/rpl/r/rpl_plugin_load.result:
  new result file
mysql-test/suite/rpl/t/rpl_plugin_load-master.opt:
  new opt file
mysql-test/suite/rpl/t/rpl_plugin_load-slave.opt:
  new opt file
mysql-test/suite/rpl/t/rpl_plugin_load.test:
  new test
sql/sql_plugin.cc:
  Suppress binlogging during insert and delete to/from the
  mysql.plugin table.

We could allocate chunks larger than 4GB, but did our
size-accounting in 32-bit values. This could lead to
spurious warnings, inaccurate accounting, and, in
theory, data loss.
  
Affected: 64-bit platforms. Debug-build (with safemalloc).
At least one buffer larger than 4GB. For potential data
loss, a re-alloc on such a buffer would be necessary.


mysys/my_static.c:
  Make memory-accounting 64-bit safe.
mysys/my_static.h:
  Make memory-accounting 64-bit safe.
  Move in struct for better alignment when 64-bit.

  - Before sending EOF, check if we've already sent an error.

mysql-test/r/subselect3.result:
  BUG#36135: void Diagnostics_area::set_eof_status(THD*): Assertion `! is_set()' failed.
  - Testcase
mysql-test/t/subselect3.test:
  BUG#36135: void Diagnostics_area::set_eof_status(THD*): Assertion `! is_set()' failed.
  - Testcase
sql/sql_class.cc:
  BUG#36135: void Diagnostics_area::set_eof_status(THD*): Assertion `! is_set()' failed.
  - Before sending EOF, check if we've already sent an error.

is used causes server crash.
  Revert the fix : unstable test case revealed by pushbuild

Bug#35161
Fixed memory leak when failing to open a partition.

Bug#20129
Added tests for verifying REPAIR PARTITION.

mysql-test/std_data/parts/t1_will_crash#P#p1_first_1024.MYD:
  Bug#20129: ALTER TABLE ... REPAIR PARTITION ... not working
  
  (see mysql-test/suite/parts/t/partition_repair_myisam.test
  Created by:
  CREATE TABLE t1_will_crash (
    a VARCHAR(255),
    b INT,
    c LONGTEXT,
    PRIMARY KEY (a, b))ENGINE=MyISAM
  PARTITION BY HASH (b)
  PARTITIONS 7;
  INSERT INTO t1_will_crash VALUES ...
  and then
  head -c 1024 var/master-data/test/t1_will_crash#P#p1.MYD
  into this file.
mysql-test/std_data/parts/t1_will_crash#P#p2.MYD:
  Bug#20129: ALTER TABLE ... REPAIR PARTITION ... not working
  
  (see mysql-test/suite/parts/t/partition_repair_myisam.test)
  copy of file right after _mi_mark_file_changed in mi_write
  was done.
mysql-test/std_data/parts/t1_will_crash#P#p2.MYI:
  Bug#20129: ALTER TABLE ... REPAIR PARTITION ... not working
  
  (see mysql-test/suite/parts/t/partition_repair_myisam.test)
  copy of file right after _mi_mark_file_changed in mi_write
  was done.
mysql-test/std_data/parts/t1_will_crash#P#p3.MYI:
  Bug#20129: ALTER TABLE ... REPAIR PARTITION ... not working
  
  (see mysql-test/suite/parts/t/partition_repair_myisam.test)
  copy of file right after *share->write_record was done.
mysql-test/std_data/parts/t1_will_crash#P#p4.MYI:
  Bug#20129: ALTER TABLE ... REPAIR PARTITION ... not working
  
  (see mysql-test/suite/parts/t/partition_repair_myisam.test)
  copy of file right after flush_cached_blocks
mysql-test/std_data/parts/t1_will_crash#P#p6.MYD:
  Bug#20129: ALTER TABLE ... REPAIR PARTITION ... not working
  
  (see mysql-test/suite/parts/t/partition_repair_myisam.test)
  copy of file right after _mi_write_part_record in
  write_dynamic_record returned for the first time.
mysql-test/std_data/parts/t1_will_crash#P#p6_2.MYD:
  Bug#20129: ALTER TABLE ... REPAIR PARTITION ... not working
  
  (see mysql-test/suite/parts/t/partition_repair_myisam.test)
  copy of file right after _mi_write_part_record in
  write_dynamic_record returned for the second time.
mysql-test/std_data/parts/t1_will_crash#P#p6_3.MYD:
  Bug#20129: ALTER TABLE ... REPAIR PARTITION ... not working
  
  (see mysql-test/suite/parts/t/partition_repair_myisam.test)
  copy of file right after _mi_write_part_record in
  write_dynamic_record returned for the third time.
  (data file fully updated).
mysql-test/suite/parts/r/partition_recover_myisam.result:
  Bug#35161
  
  Renamed since it was a test of recover
  and to make repair free for use without
  --myisam-recover
mysql-test/suite/parts/r/partition_repair_myisam.result:
  Bug#20129: ALTER TABLE ... REPAIR PARTITION ... not working
  
  New result file for testing CHECK/REPAIR of partitioned tables
mysql-test/suite/parts/t/partition_recover_myisam-master.opt:
  Bug#35161
  
  Renamed since it was a test of recover
  and to make repair free for use without
  --myisam-recover
mysql-test/suite/parts/t/partition_recover_myisam.test:
  Bug#35161
  
  Renamed since it was a test of recover
  and to make repair free for use without
  --myisam-recover
mysql-test/suite/parts/t/partition_repair_myisam.test:
  Bug#20129: ALTER TABLE ... REPAIR PARTITION ... not working
  
  New test file for testing CHECK/REPAIR of partitioned tables
sql/ha_partition.cc:
  Bug#35161
  
  Fix of memory leak when open of partition failed.

more clever gcc version checking.