Fix BUG#19542 "InnoDB doesn't increase the Handler_read_prev counter.
 


innobase/os/os0file.c:
  Applied innodb-4.1-ss29 snapshot.
   Check the page trailers also after writing to disk.
   This improves the chances of diagnosing Bug 18886.
   os_file_check_page_trailers(): New function for checking
   that two copies of the LSN stamped on the pages match.
   os_aio_simulated_handle(): Call os_file_check_page_trailers()
   before and after os_file_write().
sql/ha_innodb.cc:
  Applied innodb-4.1-ss29 snapshot.
   Increment statistic counter in ha_innobase::index_prev().

into  rurik.mysql.com:/home/igor/mysql-4.1

into  mysql.com:/usr_rh9/home/elkin.rh9/MySQL/FIXES/4.1-bug19136_unass_user_var


sql/item_func.cc:
  Auto merged

A query with a group by and having clauses could return a wrong
result set if the having condition contained a constant conjunct 
evaluated to FALSE.
It happened because the pushdown condition for table with
grouping columns lost its constant conjuncts.
Pushdown conditions are always built by the function make_cond_for_table
that ignores constant conjuncts. This is apparently not correct when
constant false conjuncts are present.



mysql-test/r/having.result:
  Added a test case for bug #14927.
mysql-test/t/having.test:
  Added a test case for bug #14927.
sql/sql_lex.cc:
  Fixed bug #14927.
  Initialized fields for having conditions in  st_select_lex::init_query().
sql/sql_lex.h:
  Fixed bug #14927.
  Added a field to restore having condititions for execution in SP and PS.
sql/sql_prepare.cc:
  Fixed bug #14927.
  Added code to restore havinf conditions for execution in SP and PS.
sql/sql_select.cc:
  Fixed bug #14927.
  Performed evaluation of constant expressions in having clauses.
  If the having condition contains a constant conjunct that is always false
  an empty result set is returned after the optimization phase.
  In this case the corresponding EXPLAIN command now returns 
  "Impossible HAVING" in the last column.

into mysql.com:/home/psergey/mysql-4.1-bug16798

into  mysql.com:/home/tomash/src/mysql_ab/mysql-4.1-bug16501

into  mysql.com:/home/tomash/src/mysql_ab/mysql-4.1-bug16501

mysql-test/r/func_misc.result:
  Update the result.

into  mysql.com:/home/mydev/mysql-4.1-bug10405

into mysql.com:/home/psergey/mysql-4.1-bug16798

The bug was as follows: When merge_key_fields() encounters "t.key=X OR t.key=Y" it will 
try to join them into ref_or_null access via "t.key=X OR NULL". In order to make this 
inference it checks if Y<=>NULL, ignoring the fact that value of Y may be not yet known.

The fix is that the check if Y<=>NULL is made only if value of Y is known (i.e. it is a
constant).
TODO: When merging to 5.0, replace used_tables() with const_item() everywhere in merge_key_fields().


mysql-test/r/innodb_mysql.result:
  Testcase for BUG16798
mysql-test/t/innodb_mysql.test:
  Testcase for BUG16798
sql/sql_select.cc:
  BUG#16798: Inapplicable ref_or_null query plan and bad query result on random occasions 
  In merge_key_fields() don't call val->is_null() if the value of val is not known.

The reason of the bug is in that `get_var_with_binlog' performs missed
assingment of
the variables as side-effect. Doing that it eventually calls
`free_underlaid_joins' to pass as an argument `thd->lex->select_lex' of the lex
which belongs to the user query, not 
to one which is emulated i.e SET @var1:=NULL.


`get_var_with_binlog' is refined to supply a temporary lex to sql_set_variables's stack.


mysql-test/r/rpl_user_variables.result:
  results changed
mysql-test/t/rpl_user_variables.test:
  a problematic query to be binlogged is added
sql/item_func.cc:
  BUG#19136: Crashing log-bin and uninitialized user variables
  
  The reason of the bug is in that how `get_var_with_binlog' performs missed
  assingment of the variables: `free_underlaid_joins' gets as an argument `thd->lex->select_lex'
  which belongs to the user query, not to one which is emulated i.e SET @var1:=NULL.
  
  `get_var_with_binlog' is refined to supply a temporary lex to sql_set_variables's stack.

into  mysql.com:/home/tomash/src/mysql_ab/mysql-4.1-bug16372

into  mysql.com:/home/tomash/src/mysql_ab/mysql-4.1-bug16372

into  mysql.com:/home/tomash/src/mysql_ab/mysql-4.1-bug16501

into  polar.kitebird.com:/src/extern/MySQL/bk/mysql-4.1

  Delete: Docs/changelog-4.1.xml


BitKeeper/deleted/.del-changelog-4.1.xml~8aa496ebed09d868:
  Delete: Docs/changelog-4.1.xml

into  polar.kitebird.com:/src/extern/MySQL/bk/mysql-4.1

  Delete: Docs/changelog-4.0.xml


BitKeeper/deleted/.del-changelog-4.0.xml~8f56ee8a913e848b:
  Delete: Docs/changelog-4.0.xml

into  ua141d10.elisa.omakaista.fi:/home/my/bk/mysql-4.1

TIME_FORMAT using "%l:%i" returns 36:00 with 24:00:00 in TIME column


mysql-test/r/date_formats.result:
  Added test case for Bug#11324,
  "TIME_FORMAT using "%l:%i" returns 36:00 with 24:00:00 in TIME column"
mysql-test/t/date_formats.test:
  Added test case for Bug#11324,
  "TIME_FORMAT using "%l:%i" returns 36:00 with 24:00:00 in TIME column"

mysql-test/r/date_formats.result:
  Added test cases for Bug#11326
mysql-test/t/date_formats.test:
  Added test cases for Bug#11326

into  a193-229-222-105.elisa-laajakaista.fi:/home/my/bk/mysql-4.1

into  mysql.com:/home/tomash/src/mysql_ab/mysql-4.1-bug16372

into  mysql.com:/home/tomash/src/mysql_ab/mysql-4.1-bug16501

into  mysql.com:/home/tomash/src/mysql_ab/mysql-4.1-bug16372

into  hundin.mysql.fi:/home/jani/mysql-4.1


sql/sql_show.cc:
  Auto merged

into  mysql.com:/home/tomash/src/mysql_ab/mysql-4.1-bug16501

into  mysql.com:/home/mysql-4.1-19025e

mysql-test/r/mysqltest.result:
  result fixed

mysqldump / SHOW CREATE TABLE will show the NEXT available value for
the PK, rather than the *first* one that was available (that named in
the original CREATE TABLE ... AUTO_INCREMENT = ... statement).

This should produce correct and robust behaviour for the obvious use
cases -- when no data were inserted, then we'll produce a statement
featuring the same value the original CREATE TABLE had; if we dump
with values, INSERTing the values on the target machine should set the
correct next_ID anyway (and if not, we'll still have our AUTO_INCREMENT =
... to do that). Lastly, just the CREATE statement (with no data) for
a table that saw inserts would still result in a table that new values
could safely be inserted to).

There seems to be no robust way however to see whether the next_ID
field is > 1 because it was set to something else with CREATE TABLE
... AUTO_INCREMENT = ..., or because there is an AUTO_INCREMENT column
in  the table (but no initial value was set with AUTO_INCREMENT = ...)
and then one or more rows were INSERTed, counting up next_ID. This
means that in both cases, we'll generate an AUTO_INCREMENT =
... clause in SHOW CREATE TABLE / mysqldump.  As we also show info on,
say, charsets even if the user did not explicitly give that info in
their own CREATE TABLE, this shouldn't be an issue.

As per above, the next_ID will be affected by any INSERTs that have
taken place, though.  This /should/ result in correct and robust
behaviour, but it may look non-intuitive to some users if they CREATE
TABLE ... AUTO_INCREMENT = 1000 and later (after some INSERTs) have
SHOW CREATE TABLE give them a different value (say, CREATE TABLE
... AUTO_INCREMENT = 1006), so the docs should possibly feature a
caveat to that effect.

It's not very intuitive the way it works now (with the fix), but it's
*correct*.  We're not storing the original value anyway, if we wanted
that, we'd have to change on-disk representation?

If we do dump/load cycles with empty DBs, nothing will change.  This
changeset includes an additional test case that proves that tables
with rows will create the same next_ID for AUTO_INCREMENT = ... across
dump/restore cycles.

Confirmed by support as likely solution for client's problem.


mysql-test/r/auto_increment.result:
  test for creation of AUTO_INCREMENT=... clause
mysql-test/r/gis-rtree.result:
  Add AUTO_INCREMENT=... clauses where appropriate
mysql-test/r/mysqldump.result:
  show that AUTO_INCREMENT=... will survive dump/restore cycles
mysql-test/r/symlink.result:
  Add AUTO_INCREMENT=... clauses where appropriate
mysql-test/t/auto_increment.test:
  test for creation of AUTO_INCREMENT=... clause
mysql-test/t/mysqldump.test:
  show that AUTO_INCREMENT=... will survive dump/restore cycles
sql/sql_show.cc:
  Add AUTO_INCREMENT=... to output of SHOW CREATE TABLE if there is an
  AUTO_INCREMENT column, and NEXT_ID > 1 (the default).  We must not print
  the clause for engines that do not support this as it would break the
  import of dumps, but as of this writing, the test for whether
  AUTO_INCREMENT columns are allowed and wether AUTO_INCREMENT=...
  is supported is identical, !(file->table_flags() & HA_NO_AUTO_INCREMENT))
  Because of that, we do not explicitly test for the feature,
  but may extrapolate its existence from that of an AUTO_INCREMENT column.

into mysql.com:/home/hf/work/mysql-4.1.mrg

into  mysql.com:/home/alexi/innodb/mysql-4.1-ss26

 Fixed BUG#19366: "consistent_snapshot.test fails".


innobase/include/dict0dict.ic:
  Applied innodb-4.1-ss26 snapshot.
   Remove too strict assertions from some dict_table_t
   accessor functions (Bug#19366).

into mysql.com:/home/hf/work/mysql-4.1.mrg


mysql-test/mysql-test-run.pl:
  Auto merged
sql/sql_table.cc:
  Auto merged

into  a193-229-222-105.elisa-laajakaista.fi:/home/my/bk/mysql-4.1

into mysql.com:/home/hf/work/mysql-4.1.mrg

into mysql.com:/home/hf/work/mysql-4.1.mrg

into mysql.com:/home/hf/work/mysql-4.1.mrg


sql/sql_table.cc:
  Auto merged