returns wrong results

Casting AVG() to DECIMAL led to incorrect results when the arguments
had a non-DECIMAL type, because in this case
Item_sum_avg::val_decimal() performed the division by the number of
arguments twice.

Fixed by changing Item_sum_avg::val_decimal() to not rely on
Item_sum_sum::val_decimal(), i.e. calculate sum and divide using
DECIMAL arithmetics for DECIMAL arguments, and utilize val_real() with
subsequent conversion to DECIMAL otherwise.


mysql-test/r/func_group.result:
  Added a test case for bug #34512.
mysql-test/t/func_group.test:
  Added a test case for bug #34512.
sql/item_sum.cc:
  Do not use Item_sum_sum::val_decimal() in Item_sum_avg::val_decimal()
  because the first one, depending on the arguments type, may return
  either the sum of the arguments, or the average calculated by the
  virtual val_real() method of Item_sum_avg. Instead, do our own
  calculation based on the arguments type.

into  kaamos.(none):/data/src/opt/mysql-5.0-opt

                    with errno 17

my_create() did not perform any checks for the case when a file is
successfully created by a call to open(), but the call to
my_register_filename() later fails because the number of open files
has exceeded the my_open_files limit. This can happen on platforms 
which do not have getrlimit(), and hence we do not know the real limit
for open files. In such a case an error was returned to a caller
although the file has actually been created. Since callers assume
my_create() to return an error only when it failed to create a file,
they did not perform any cleanups, leaving an 'orphaned' file on the
file system.

Fixed by adding a check for the above case to my_create() and ensuring
the newly created file is deleted before returning an error.

Creating a deterministic test case in the test suite is impossible,
because the exact steps required to reproduce the above situation
depend on the platform and/or environment (OS per-user limits, queries
executed by previous tests, startup parameters). The patch was
manually tested on Windows using examples posted in the bug report.


mysys/my_create.c:
  Ensure that, if the call to my_register_filename() in my_create()
  failed, but the previous open() called succeeded, the newly created
  file is deleted before returning an error.

into  host.loc:/home/uchum/work/5.0-opt

into  mysql.com:/home/gluh/MySQL/Merge/5.0-opt


mysql-test/t/symlink.test:
  Auto merged
mysql-test/r/symlink.result:
  after merge fix

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

                  and Item_direct_ref constructor calls.

Order of ref->field_name and ref->table_name arguments
is of Item_ref and Item_direct_ref in the fix_inner_refs
function is inverted.


sql/sql_select.cc:
  Fixed bug #34830: mixed table and field names in Item_ref
                    and Item_direct_ref constructor calls.
  
  Order of ref->field_name and ref->table_name arguments
  is of Item_ref and Item_direct_ref in the fix_inner_refs
  function is inverted. See definitions:
  
    Item_ref(Name_resolution_context *context_arg, Item **item,
             const char *table_name_arg, const char *field_name_arg,
             bool alias_name_used_arg= FALSE)
    and
  
    Item_direct_ref(Name_resolution_context *context_arg, Item **item,
                    const char *table_name_arg,
                    const char *field_name_arg,
                    bool alias_name_used_arg= FALSE)

into  mysql.com:/home/gluh/MySQL/Merge/5.0-opt


sql/mysql_priv.h:
  Auto merged
mysql-test/r/symlink.result:
  manual merge
mysql-test/t/symlink.test:
  manual merge
sql/mysqld.cc:
  manual merge
sql/sql_parse.cc:
  manual merge

added new function test_if_data_home_dir() which checks that
path does not contain mysql data home directory.
Using of mysql data home directory in
DATA DIRECTORY & INDEX DIRECTORY is disallowed.


mysql-test/r/symlink.result:
  test result
mysql-test/t/symlink.test:
  test case
sql/mysql_priv.h:
  new variable mysql_unpacked_real_data_home
sql/mysqld.cc:
  new variable mysql_unpacked_real_data_home
sql/sql_parse.cc:
  added new function test_if_data_home_dir() which checks that
  path does not contain mysql data home directory.
  Using of mysql data home directory in
  DATA DIRECTORY & INDEX DIRECTORY is disallowed.

into  host.loc:/home/uchum/work/5.0-opt

                  Assertion `0' failed

If ROW item is a part of an expression that also has
aggregate function calls (COUNT/SUM/AVG...), a
"splitting" with an Item::split_sum_func2 function
is applied to that ROW item.
Current implementation of Item::split_sum_func2
replaces this Item_row with a newly created
Item_aggregate_ref reference to it.
Then the row cache tries to work with the
Item_aggregate_ref object as with the Item_row object:
row cache calls row-emulation methods such as cols and
element_index. Item_aggregate_ref (like it's parent
Item_ref) inherits dummy implementations of those
methods from the hierarchy root Item, and call to
them leads to failed assertions and wrong data
output.

Row-emulation virtual functions (cols, element_index, addr,
check_cols, null_inside and bring_value) of Item_ref have
been overloaded to forward calls to an underlying item
reference.




mysql-test/r/row.result:
  Added test case for bug #34620.
mysql-test/t/row.test:
  Added test case for bug #34620.
sql/item.h:
  Fixed bug #34620.
  Row-emulation virtual functions (cols, element_index, addr,
  check_cols, null_inside and bring_value) of Item_ref have
  been overloaded to forward calls to an underlying item
  reference.

into  magare.gmz:/home/kgeorge/mysql/autopush/B34747-5.0-opt

Was a double-free of the Unique member of Item_func_group_concat.
This was not causing a crash because the Unique is a descendent of
Sql_alloc.
Fixed to free the Unique only if it was allocated for the instance 
of Item_func_group_concat it was referenced from


mysql-test/r/func_gconcat.result:
  Bug #34747: test case
mysql-test/t/func_gconcat.test:
  Bug #34747: test case
sql/item_sum.cc:
  Bug #34747: free the Unique only if it was allocated
  for this instance of Item_func_group_concat

into  kaamos.(none):/data/src/opt/mysql-5.0-opt

the patch for bug #33834.

into  mysql.com:/home/hf/work/25097/my50-25097


libmysql/libmysql.c:
  Auto merged
libmysqld/lib_sql.cc:
  Auto merged
sql/log.cc:
  Auto merged

There was no way to return an error from the client library
if no MYSQL connections was established.
So here i added variables to store that king of errors and
made functions like mysql_error(NULL) to return these.


client/mysql.cc:
  Bug #25097 mysql_server_init fails silently if no errmsg.sys is present.
  
  Show the error message on std_error
include/sql_common.h:
  Bug #25097 mysql_server_init fails silently if no errmsg.sys is present.
  
  cant_connect_sqlstate constant declared
libmysql/libmysql.c:
  Bug #25097 mysql_server_init fails silently if no errmsg.sys is present.
  
  mysql_sqlstate(NULL) returns 'unknown_sqlstate'
libmysqld/lib_sql.cc:
  Bug #25097 mysql_server_init fails silently if no errmsg.sys is present.
  
  EMBEDDED_SERVER version of the vprint_msg_to_log() implemented
sql-common/client.c:
  Bug #25097 mysql_server_init fails silently if no errmsg.sys is present.
  
  mysql_server_last_errno and mysql_server_last_error introduced
  to store errors not related to particular connections.
  
  mysql_error(NULL) and mysql_errno(NULL) now returns these
  mysql_server_last_error and errno respectively
sql/log.cc:
  Bug #25097 mysql_server_init fails silently if no errmsg.sys is present.
  
  EMBEDDED_LIBRARY implementation of the vprint_msg_to_log() moved
  to lib_sql.cc

into  kaamos.(none):/data/src/opt/mysql-5.0-opt


sql/sql_yacc.yy:
  Auto merged

                    documentation

While the manual mentions FRAC_SECOND only for the TIMESTAMPADD()
function, it was also possible to use FRAC_SECOND with DATE_ADD(),
DATE_SUB() and +/- INTERVAL.

Fixed the parser to match the manual, i.e. using FRAC_SECOND for 
anything other than TIMESTAMPADD()/TIMESTAMPDIFF() now produces a 
syntax error.

Additionally, the patch allows MICROSECOND to be used in TIMESTAMPADD/
TIMESTAMPDIFF and marks FRAC_SECOND as deprecated.


mysql-test/r/func_time.result:
  Added a test case for bug #33834.
mysql-test/t/func_time.test:
  Added a test case for bug #33834.
sql/sql_yacc.yy:
  Reject FRAC_SECOND for anything other than TIMESTAMPADD() or
  TIMESTAMPDIFF().
  Allow MICROSECOND to be used with TIMESTAMPADD()/TIMESTAMPDIFF().
  Warn about FRAC_SECOND being a deprecated unit.

into  kaamos.(none):/data/src/opt/mysql-5.0-opt

into  magare.gmz:/home/kgeorge/mysql/autopush/B30604-5.0-opt

into  mysql.com:/home/gluh/MySQL/mysql-5.0-opt

                    suite)

Under some circumstances a combination of aggregate functions and
GROUP BY in a SELECT query over a VIEW could lead to incorrect
calculation of the result type of the aggregate function. This in
turn could result in incorrect results, or assertion failures on debug
builds.

Fixed by changing the logic in Item_sum_hybrid::fix_fields() so that
the argument's item is dereferenced before calling its type() method.


mysql-test/r/view.result:
  Added a test case for bug #33049.
mysql-test/t/view.test:
  Added a test case for bug #33049.
sql/item_sum.cc:
  When calculating the result type of an aggregate function, dereference
  the argument's item before calling its type() method.

skip lock_type update for temporary tables


mysql-test/r/tablelock.result:
  test result
mysql-test/t/tablelock.test:
  test case
sql/sql_base.cc:
  skip lock_type update for temporary tables

into  moonbone.local:/work/33266-bug-5.0-opt-mysql

The test case for the bug#31048 checks that there is no crash on stack
overrun. But due to different stack sizes on different platforms it failed
on some of them.

The new test case check that a query with at least 4 level subquery nesting
works without the stack overrun nesting and other levels of nesting doesn't
cause a crash.


mysql-test/t/subselect.test:
  Corrected test case for the bug#31048.
mysql-test/r/subselect.result:
  Corrected test case for the bug#31048.

  and ps-protocol
Finding a routine should be a transparent operation as 
far as the binary log is concerned.
But it was influencing the binary log because of the TIMESTAMP
column in the proc table.

Fixed by preserving and restoring the time_zone usage flag when
searching for a stored routine in the proc table.


mysql-test/r/binlog_innodb.result:
  Bug #30604: test case
mysql-test/r/ctype_cp932_binlog.result:
  Bug #30604: updated test results (a procedure call before that)
mysql-test/t/binlog_innodb.test:
  Bug #30604: test case
sql/sp.cc:
  Bug #30604: finding a routine should be a transparent operation as 
  far as the binary log is concerned.
  Fixed by preserving and restoring the time_zone usage flag.

into  mysql.com:/home/hf/work/32942/my50-32942


sql/sql_select.cc:
  Auto merged
mysql-test/r/select.result:
  merging
mysql-test/t/select.test:
  merging

into  kaamos.(none):/data/src/opt/mysql-5.0-opt


sql/item.cc:
  Auto merged

Problem is not about intervals and doesn't actually cause 'full table scan'.
We have an optimization for DISTINCT when we have
'DISTINCT field_from_first_join_table' we don't need to read all the
rows from the JOIN-ed table if we found one conforming row.
It stopped working in 5.0 as we return NESTED_LOOP_OK if we came upon
that case in the evaluate_join_record() and that doesn't break the
recordreading loop in sub_select().

Fixed by returning NESTED_LOOP_NO_MORE_ROWS in this case.


mysql-test/r/select.result:
  Bug #32942 now() - interval '7200' second is NOT pre-calculated, causing "full table scan".
  
  test result
mysql-test/t/select.test:
  Bug #32942 now() - interval '7200' second is NOT pre-calculated, causing "full table scan"
  
  test case
sql/sql_select.cc:
  Bug #32942 now() - interval '7200' second NOT pre-calculated, causing "full table scan"
  
  return NESTED_LOOP_NO_MORE_ROWS when we don't need to read rows from
  this table anymore

into  kaamos.(none):/data/src/opt/mysql-5.0-opt

into  kaamos.(none):/data/src/opt/mysql-5.0-opt


mysql-test/r/variables.result:
  Auto merged
mysql-test/t/variables.test:
  Auto merged
sql/item.cc:
  Auto merged
sql/item_cmpfunc.cc:
  Auto merged
sql/sql_acl.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
sql/sql_yacc.yy:
  Auto merged
mysql-test/r/sp.result:
  Manual merge.
mysql-test/t/sp.test:
  Manual merge.

into  kaamos.(none):/data/src/opt/mysql-4.1-opt

into  magare.gmz:/home/kgeorge/mysql/autopush/B31887-5.0-opt


sql/item.cc:
  Auto merged
sql/mysql_priv.h:
  Auto merged

when executed in version 5

Zero fill is a field attribute only. So we can't always 
propagate  constants for zerofill fields : the values and 
expression results don't have that flag.

Fixed by converting the const value to a string and 
using that in const propagation when the context allows it. 
Disable const propagation for fields with ZEROFILL flag in
all the other cases.


mysql-test/r/compare.result:
  Bug #31887: test case
mysql-test/t/compare.test:
  Bug #31887: test case
sql/item.cc:
  Bug #31887: If the context allows conversion
  of an int constant to a zero-filled string constant
  put the string constant instead of the int constant
  when doing const propagation
sql/mysql_priv.h:
  Bug #31887: a macro to get all the Field_num
  descendant fields.

into  kaamos.(none):/data/src/opt/mysql-5.0-opt

into  host.loc:/home/uchum/work/5.0-opt