Backported multi_update_check_table_access() from 5.6

The code is slightly different in MariaDB, becasue we instansiate fields in merged tables earlier.

mysql-test/mysql-test-run.pl:
  Fixed comment
mysql-test/r/view_grant.result:
  Merged test case from 5.6
mysql-test/t/view_grant.test:
  Merged test case from 5.6
sql/sql_parse.cc:
  Reset orig_want_privilege as this will be rechecked later.
  If not, we will have a problem in mysql_multi_update_prepare() for the call to mysql_handle_derived()
sql/sql_update.cc:
  Backport multi_update_check_table_access() from 5.6

Fixed use-copy option to mysql-test-run

mysql-test/mysql-test-run.pl:
  Fixed use-copy and added comment
sql/log.cc:
  Make copy_up_file_and_fill() safe for disk full

mysql-test/r/create_or_replace.result:
  More tests for create or replace
mysql-test/t/create_or_replace.test:
  More tests for create or replace
sql/log.cc:
  Don't use binlog_hton if binlog is not enabmed
sql/sql_base.cc:
  We have to call restart_trans_for_tables also if tables where not locked with LOCK TABLES.
  If not, we will get a crash in TokuDB
sql/sql_insert.cc:
  Don't call binlog_reset_cache() if we don't have binary log open
sql/sql_table.cc:
  Don't log to binary log if not open
  Better test if we where using create or replace ... select
storage/tokudb/mysql-test/tokudb_mariadb/r/create_or_replace.result:
  More tests for create or replace
storage/tokudb/mysql-test/tokudb_mariadb/t/create_or_replace.test:
  More tests for create or replace

Copied relevant test cases and code from the MySQL 5.6 tree
Testing of my_use_symdir moved to engines.


mysql-test/r/partition_windows.result:
  Updated result file
mysql-test/suite/archive/archive_no_symlink-master.opt:
  Testing of symlinks with archive
mysql-test/suite/archive/archive_no_symlink.result:
  Testing of symlinks with archive
mysql-test/suite/archive/archive_no_symlink.test:
  Testing of symlinks with archive
mysql-test/suite/archive/archive_symlink.result:
  Testing of symlinks with archive
mysql-test/suite/archive/archive_symlink.test:
  Testing of symlinks with archive
sql/log_event.cc:
  Updated comment
sql/partition_info.cc:
  Don't test my_use_symdir here
sql/sql_parse.cc:
  Updated comment
sql/sql_table.cc:
  Don't test my_use_symdir here
sql/table.cc:
  Added more DBUG_PRINT
storage/archive/ha_archive.cc:
  Give warnings for index_file_name and if we can't use data directory
storage/myisam/ha_myisam.cc:
  Give warnings if we can't use data directory or index directory

I had forgot to check if binary logging and that we had logged row log events before clearing the transaction cache.

Bug #3329 Incomplete lower_case_table_names=2 implementation

The problem was that check_db_name() converted database names to lower case also in case of lower_case_table_names=2.

Fixed by removing the conversion in check_db_name for lower_case_table_names = 2 and instead converting db name to
lower case at same places as table names are converted.

Fixed bug that SHOW CREATE DATABASE FOO showed information for database 'foo'.

I also removed some checks of lower_case_table_names when it was enough to use table_alias_charset.


mysql-test/mysql-test-run.pl:
  Added --use-copy argument to force mysql-test-run to copy files instead of doing symlinks. This is needed when you run
  with test directory on another file system
mysql-test/r/lowercase_table.result:
  Updated results
mysql-test/r/lowercase_table2.result:
  Updated results
mysql-test/suite/parts/r/partition_mgm_lc2_innodb.result:
  Updated results
mysql-test/suite/parts/r/partition_mgm_lc2_memory.result:
  Updated results
mysql-test/suite/parts/r/partition_mgm_lc2_myisam.result:
  Updated results
mysql-test/t/lowercase_table.test:
  Added tests with mixed case databases
mysql-test/t/lowercase_table2.test:
  Added tests with mixed case databases
sql/log.cc:
  Don't check lower_case_table_names when we can use table_alias_charset
sql/sql_base.cc:
  Don't check lower_case_table_names when we can use table_alias_charset
sql/sql_db.cc:
  Use cmp_db_names() for checking if current database changed.
  mysql_rm_db() now converts db to lower case if lower_case_table_names was used.
  Changed database options cache to use table_alias_charset. This fixed a bug where SHOW CREATE DATABASE showed wrong information.
sql/sql_parse.cc:
  Change also db name to lower case when file names are changed.
  Don't need to story copy of database name anymore when lower_case_table_names == 2 as check_db_name() don't convert in this case.
  Updated arguments to mysqld_show_create_db().
  When adding table to TABLE_LIST also convert db name to lower case if needed (same way as we do with table names).
sql/sql_show.cc:
  mysqld_show_create_db() now also takes original name as argument for output to user.
sql/sql_show.h:
  Updated prototype for mysqld_show_create_db()
sql/sql_table.cc:
  In mysql_rename_table(), do same conversions to database name as we do for the file name

Patch from 5.6 by Praveenkumar Hulakund
Bug#13608112 - 64048: MYSQL_PRINT_STATUS() MISSING FINAL FFLUSH()
  
  Analysis:
  While printing debug information, memory related information and event
  related information were written to buffer after flushing it. Because of this,
  these information were getting printed when we do the next flush.
  
  Fix:
  Instead of calling fflush() before writing memory and event
  information, calling it after memory and event information.

sql/log_event.cc:
  Added THD_STAGE_INFO when applying row events

- Move [some] engine-agnostic tests from t/selectivity.test to t/selectivity_no_engine.test
- Move Histogram::point_selectivity to sql_statistics.cc

- Histogram::find_bucket() should not walk off the end of the value range.
- Address review feedback in Histogram::point_selectivity(): different handling
  for zero-width buckets, and explanations.

remove dead code

MDEV-5839 TokuDB tables not properly cleaned on DROP DATABASE

TokuDB does not support discover_table_names() and writes no files
in the database directory, so automatic filename-based
discover_table_names() doesn't work either. So, it must force .frm
file to disk in ::create()

Don't abort plugin reads whem mpvio->make_it_fail is set - this can leak information.

Rename back my_init_dynamic_array2() -> init_dynamic_array2()
It happens to be a part of the de facto API :(

MDEV-5955 Server crashes in handler::ha_external_lock or assertion `m_lock_type == 2' fails in handler::ha_close on disconnect with a locked temporary table

first unlock locked tables, then close and remove temporary

The reason was that a couple of variables that hold number of rows that was used to calculate buffers was uint and caused an overflow.

Fixed by changing variables that could hold number of rows from uint to ulong and also added a cast for this test.

include/heap.h:
  Reorder to get better alignment. Changed variables that could hold number of rows from uint to ulong
mysql-test/suite/heap/heap.result:
  Added test case
mysql-test/suite/heap/heap.test:
  Added test case
mysql-test/suite/plugins/t/server_audit.test:
  Added sleep as we want to have disconnect logged before we try a new connect
storage/heap/ha_heap.cc:
  Changed variables that could hold number of rows from uint to ulong
  Limit number of rows to 4G  (as most of the variables that holds rows are ulong anyway)
  reset records_changed when key_stat_version is changed to not cause increments for every row changed
storage/heap/ha_heap.h:
  changed records_changed to ulong as this can get big
storage/heap/hp_create.c:
  Changed variables that could hold number of rows from uint to ulong
  Added cast (fixed the original bug)
storage/heap/hp_delete.c:
  Changed variables that could hold number of rows from uint to ulong
storage/heap/hp_open.c:
  Removed not needed cast
storage/heap/hp_write.c:
  Changed variables that could hold number of rows from uint to ulong
support-files/compiler_warnings.supp:
  Removed extra : from supression

- Fix Histogram::point_selectivity() to work in the case where the 
  passed value_pos=0 (or 1) and the first (or the last) bucket in the 
  histogram has zero value-range (i.e one value).

[Attempt #2]
- Use a new selectivity calculation formula in Histogram::point_selectivity. 
  The formula is different from the old one because it was developed from scratch.
  it doesn't have any possible division-by-zero problems.

MDEV-5920 MySQL Bug#16765410 FTS: STACK AROUND THE VARIABLE 'MYSTR' WAS CORRUPTED IN INNOBASE_STRNXFRM

MDEV-5861 MySQL Bug#12601974 - STORED PROCEDURE SQL_MODE=NO_BACKSLASH_ESCAPES IGNORED AND BREAKS REPLICATION

escape usernames in CREATE/DROP USER error messages according to NO_BACKSLASH_ESCAPES

simplify the prototype and move it to sql_string.h

  use LEX_STRING, keep similar functions together, remove duplicated code

field list, it doesn't work if ALTER TABLE has replaced all fields.
Instead, pass the correct original table name down from the caller.

from the variable @@session.tokudb_row_format

MDEV-5815 MySQL BUG#11751736: DROP DATABASE STATEMENT SHOULD REMOVE .OLD SUFFIX FROM DATABASE DIRECTORY

Delete .OLD and .TMD files when a MyISAM table is dropped.
Same for Aria.

sql/sql_db.cc:
  dead code - *.TMD cannot be deleted from here.

previous file->index_next (or other file->... index access method)
succeeded

in the libmysqlclient_16 version node.

add pthread_mutex_destroy(&THR_LOCK_dbug); that was apparently
forgotten since the very first MySQL version

error message (because error messages use replacements)