sql/ha_innodb.cc:
Auto merged
sql/ha_ndbcluster.cc:
Auto merged
sql/item.cc:
Auto merged
sql/item_cmpfunc.cc:
Auto merged
sql/item_cmpfunc.h:
Auto merged
sql/key.cc:
Auto merged
sql/mysql_priv.h:
Auto merged
sql/mysqld.cc:
Auto merged
sql/opt_range.cc:
Auto merged
sql/sp_head.cc:
Auto merged
sql/sql_acl.cc:
Auto merged
sql/sql_parse.cc:
Auto merged
sql/sql_select.cc:
Auto merged
sql/sql_show.cc:
Auto merged
sql/sql_table.cc:
Auto merged
sql/unireg.cc:
Auto merged
Added option --count to mysqlshow (to show number of rows)
Fixed possible core dump in information schema
client/client_priv.h:
--count for mysqlshow
client/mysqlshow.c:
Added option --count to be used when the user want's number of rows per table in the output
(We shouldn't use count(*) as default as this can be a slow operation)
mysys/my_thr_init.c:
Correct comment
sql/ha_berkeley.cc:
Remove not used variable
sql/ha_berkeley.h:
Remove not used variable
sql/ha_innodb.cc:
Remove not used function
sql/ha_ndbcluster.cc:
false -> FALSE
true -> TRUE
sql/handler.cc:
Added and fixed comments
Remove 'strange' code to remove compiler warnings (better to do things like this with attribute)
sql/item.cc:
false -> FALSE
sql/item_cmpfunc.cc:
Fixed indentation
sql/item_cmpfunc.h:
marked BETWEEN as a bool function
sql/item_func.cc:
Simple optimzation
sql/key.cc:
Removed wrong code
sql/log.cc:
Check result from open_index_file()
sql/mysql_priv.h:
Simplyfy some test of netware
sql/mysqld.cc:
Fixed indentation
Check result form open_index_file()
Simplify code with IF_NETWARE()
sql/opt_range.cc:
false -> FALSE
true -> TRUE
Fixed indentation
sql/opt_sum.cc:
Fixed comments
sql/sp_head.cc:
Simple optimzation
Move variable declarations to begining of blocks
sql/sql_acl.cc:
Fix long lines
Rename xx -> column
Move declaration to beginning of block
sql/sql_parse.cc:
Removed comment
sql/sql_select.cc:
Indentation fixes
sql/sql_show.cc:
Fixed reference outside of array (possible core dump)
sql/sql_table.cc:
Simplify code
Combine common code
sql/sql_test.cc:
false -> FALSE
sql/sql_trigger.cc:
false -> false
true -> TRUE
sql/sql_yacc.yy:
Simpler test
sql/unireg.cc:
Added comment
Mostly about precision/decimals of the results of the operations
include/decimal.h:
decimal interface changed a little
sql/field.cc:
a lot of precision/decimals related changes to the Field_new_decimal
sql/field.h:
Field_new_decimal interface changed
sql/ha_ndbcluster.cc:
f->precision should be used here
sql/item.cc:
precision/decimals counting related changes
sql/item.h:
precision/decimals counting related changes
sql/item_cmpfunc.cc:
precision/decimals counting related changes
sql/item_cmpfunc.h:
precision/decimals counting related changes
sql/item_func.cc:
precision/decimals counting related changes
sql/item_func.h:
precision/decimals counting related changes
sql/item_sum.cc:
precision/decimals counting related changes
sql/item_sum.h:
precision/decimals counting related changes
sql/my_decimal.cc:
precision/decimals counting related changes
sql/my_decimal.h:
precision/decimals counting related changes
sql/mysqld.cc:
precision/decimals counting related changes
sql/set_var.cc:
precision/decimals counting related changes
sql/sp_head.cc:
dbug_decimal_print was replaced with dbug_decimal_as_string
sql/sql_class.h:
div_precincrement variable added
sql/sql_parse.cc:
precision/decimals counting related changes
sql/sql_select.cc:
precision/decimals counting related changes
sql/sql_show.cc:
Field::representation_length was removed
strings/decimal.c:
decimal_actual_fraction was introduced
BitKeeper/etc/logging_ok:
Logging to logging@openlogging.org accepted
cases + bug fixes
mysys/my_bitmap.c:
Removed debug comments
sql/bitvector.h:
Changed a number of things
Added new methods, new handling of end bits, faster search
for bits using word by word search..
sql/field.h:
Added comment
sql/ha_federated.cc:
Fixes
sql/ha_innodb.cc:
Fixes
sql/ha_innodb.h:
InnoDB still needs the extra calls not needed by anybody else
sql/ha_ndbcluster.cc:
Removed some timestamp set bit stuff
Always write all fields in write_row
sql/handler.cc:
No inline methods in bit interface (caused strange bugs)
initialise method
sql/handler.h:
Changed to bitvector from bitmap
Removed init variable
sql/opt_range.cc:
Removed all extra HA_EXTRA_RETRIEVE_*
sql/sql_acl.cc:
Removed all extra HA_EXTRA_RETRIEVE_*
sql/sql_base.cc:
Set bits previously missed
sql/sql_insert.cc:
Removed all extra HA_EXTRA_RETRIEVE_*
Timestamp handling
sql/sql_load.cc:
Updated comments plus set all bits in bitvector
sql/sql_select.cc:
Removed ifdef since NDB and Federated needs the same calls
Added comment or rather changed comment.
sql/sql_table.cc:
Removed HA_EXTRA_RETRIEVE_* calls
Updated comments
sql/sql_udf.cc:
Removed HA_EXTRA_RETRIEVE_* calls
Updated comments
sql/sql_update.cc:
Removed HA_EXTRA_RETRIEVE_* calls
Timstamp updating
into serg.mylan:/usr/home/serg/Abk/mysql-5.0
Makefile.am:
Auto merged
client/mysqladmin.cc:
Auto merged
configure.in:
Auto merged
include/my_global.h:
Auto merged
sql/item_func.cc:
Auto merged
sql/mysqld.cc:
Auto merged
sql/sql_select.cc:
Auto merged
BitKeeper/etc/logging_ok:
auto-union
configure.in:
Auto merged
include/config-win.h:
Auto merged
include/my_global.h:
Auto merged
mysql-test/r/drop.result:
Auto merged
mysys/default.c:
Auto merged
mysys/mf_keycache.c:
Auto merged
sql/field.h:
Auto merged
sql/item.h:
Auto merged
sql/item_func.cc:
Auto merged
sql/item_func.h:
Auto merged
sql/mysqld.cc:
Auto merged
BitKeeper/deleted/.del-errmsg.txt~f96b7055cac394e:
Auto merged
mysql-test/r/cast.result:
Merge
mysql-test/t/cast.test:
Merge
sql/sql_insert.cc:
Merge
sql/sql_select.cc:
Merge
with cursor". The patch refactors do_select/sub_select
functions, which implement the nested loop algorithm, and reuses them to
fetch rows for cursors as well.
Pushing with view.test failing (--ps-protocol).
sql/sql_prepare.cc:
Cursor::fetch() now returns void
sql/sql_select.cc:
A fix for Bug#9520 "SELECT DISTINCT crashes server with cursor":
* rename sub_select returns codes to be able to track down what's going
on in which case.
* move record processing and outer join record processing to a separate
function, out of sub_select read-record loop.
* use generalized sub_select() nested loop function for
cursors instead of own loop implementation used in Cursor::fetch() before
sql/sql_select.h:
Replace all return values of sub_select family with enum.
Add JOIN::resume_nested_loop flag to indicate we are restarting the nested loop
for execution of next chunk of cursor's rows.
tests/mysql_client_test.c:
A test case for Bug#9520 "SELECT DISTINCT crashes server with cursor"
Reset old error if tmp table was successfully created.
Test data is large and can be found in bug report along with test query.
sql/sql_select.cc:
Fix bug #9703
BitKeeper/etc/logging_ok:
Logging to logging@openlogging.org accepted
Make get_quick_select_for_ref() accept estimated # records as parameter and
set QUICK_RANGE_SELECT::records, as this value is used to allocate buffers
in Multi-Range Read.
sql/opt_range.cc:
Make get_quick_select_for_ref() accept estimated # records as parameter and
set QUICK_RANGE_SELECT::records, as this value is used to allocate buffers
in Multi-Range Read.
sql/opt_range.h:
Added "records" parameter to get_quick_select_for_ref()
sql/sql_select.cc:
Added "records" parameter to get_quick_select_for_ref()
to read and write
Changed Server code, added new interface to handler and changed the
NDB handler, InnoDB handler and Federated handler that previously used
query_id
Bug#10202 fix (one-liner fix for memory leak)
mysys/my_bitmap.c:
Debug code
sql/field.cc:
Initialise fieldnr to 0 if not set anywhere else
sql/field.h:
Introduce a fieldnr (first field = 1 and last = table->s->fields
in field object to be able to quickly set appropriate bit in
read/write set
sql/ha_federated.cc:
Changed federated handler to use write set instead of query_id
sql/ha_innodb.cc:
Changed InnoDB handler to use write set instead of query_id
sql/ha_ndbcluster.cc:
Changed NDB handler to use write set instead of query_id
sql/ha_ndbcluster.h:
Changed NDB handler to use write set instead of query_id
sql/handler.cc:
Allocate read_set and write_set either in get_new_handler or in
special routine
Routines used at destruction of handler object
plus routine to set all primary key fields in read_set
sql/handler.h:
bool to keep track if read/write set allocated or not in handler
Deallocate read/write set at delete of handler object
New bitmap's for read/write set
sql/item.cc:
Set bits in read or write set (set_query_id = 2 => write_set
set_query_id = 1 => read_set
sql/lock.cc:
Clear bit set when starting a new statement in external lock
sql/mysql_priv.h:
changed set_query_id from bool to ulong
sql/opt_range.cc:
Set primary key read set in all places where HA_EXTRA_RETRIEVE_PRIMARY_KEY
is used
sql/sql_acl.cc:
set all bits in read set all places where HA_EXTRA_RETRIEVE_ALL_COLS
are used
sql/sql_base.cc:
Clear all bits before start new statement when table locked already
Set bit in read/write set dependent on set_query_id and fieldnr
bool -> ulong for set_query_id
set all bits in read set for SELECT * queries where table is not view
sql/sql_class.h:
Added comments + changed type of set_query_id
sql/sql_insert.cc:
Use 2 when setup_fields called for fields to updated in UPDATE
and INSERT statements
set primary key fields when EXTRA param used
sql/sql_load.cc:
Set all bits in write set if no fields specified in LOAD DATA FROM
INFILE
Otherwise use 2 to set specific fields to be updated by LOAD DATA...
sql/sql_select.cc:
Set primary key read set when EXTRA param specified
Set fieldnr for temporary tables
Set number of fields before calling get_new_handler
and only set all bits if there at least one field in table
sql/sql_table.cc:
Set all bits in read set for old table and all bits in write set for
new table for ALTER TABLE copy method
Set all bits in read set when EXTRA param used
sql/sql_udf.cc:
Set all bits in read set when EXTRA param used
sql/sql_update.cc:
Set fields to UPDATE to use 2 for set_query_id
Set all bits in read set when EXTRA param used
sql/table.cc:
Set fieldnr in openfrm
Reallocate read/write set in openfrm since table->s->fields==0
at call to get_new_handler
sql/unireg.cc:
Fix Bug #10202
that merges ON and WHERE (BUG#10162)
mysql-test/r/join_outer.result:
BUG#10162 - ON is merged with WHERE, left join is convered to a regular join
mysql-test/t/join_outer.test:
BUG#10162 - ON is merged with WHERE, left join is convered to a regular join
mysys/default.c:
Cleanup:
- Just test once for recursion level
- Don't test explicitely for \r or \n as my_isspace() already does that
sql/sql_insert.cc:
Fix argument
sql/sql_select.cc:
Fixed indentation
added comment
Fixed bug #9681.
The bug happened with queries using derived tables specified by
a SELECT with ROLLUP, such as:
SELECT * FROM (SELECT a, SUM(a) FROM t1 GROUP BY a WITH ROLLUP) t2,
if column a of table t1 is declared as NOT NULL.
This was to the fact that the first column of the temporary table
created to contain the derived table erroneously inherited the NOT NULL
attribute from column a.
olap.result, olap.test:
Added a test case for bug #9681.
mysql-test/t/olap.test:
Added a test case for bug #9681.
mysql-test/r/olap.result:
Added a test case for bug #9681.
sql/sql_select.cc:
Fixed bug #9681.
The bug happened with queries using derived tables specified by
a SELECT with ROLLUP, such as:
SELECT * FROM (SELECT a, SUM(a) FROM t1 GROUP BY a WITH ROLLUP) t2,
if column a of table t1 is declared as NOT NULL.
This was to the fact that the first column of the temporary table
created to contain the derived table erroneously inherited the NOT NULL
attribute from column a.
Don't produce data truncation warnings from within cp_buffer_from_ref(). This function
is only used to make index search tuples and data truncation that occurs here has no
relation with truncated values being saved into tables.
mysql-test/r/update.result:
Testcase for BUG#9103
mysql-test/t/update.test:
Testcase for BUG#9103
sql/opt_range.cc:
cp_buffer_from_ref now has THD* parameter
sql/sql_select.h:
cp_buffer_from_ref now has THD* parameter
Added a test case for bug #9338.
sql_select.cc:
Fixed bug #9338.
When an occurence of a field reference has to be replaced
by another field reference the whole Item_field must be
replaced.
item.cc:
Fixed bug #9338.
The method Item_field::replace_equal_field_processor was
replaced by Item_field::replace_equal_field. The new method
is used to replace the occurences of Item_field objects.
item.h:
Fixed bug #9338.
The virtual function replace_equal_field_processor was replaced
by replace_equal_field. The latter is supposed to be used as a
callback function in calls of the method transform.
sql/item.h:
Fixed bug #9338.
The virtual function replace_equal_field_processor was replaced
by replace_equal_field. The latter is supposed to be used as a
callback function in calls of the method transform.
sql/item.cc:
The method Item_field::replace_equal_field_processor was
replaced by Item_field::replace_equal_field The new method
is used to replace the occurences of Item_field objects.
sql/sql_select.cc:
Fixed bug #9338.
When an occurence of a field reference has to be replaced
by another field reference the whole Item_field must be
replaced.
mysql-test/t/subselect.test:
Added a test case for bug #9338.
mysql-test/r/subselect.result:
Added a test case for bug #9338.
Fixed warnings by valgrind for sum_distinct.test
Enable buffered-record-reads after filesort for InnoDB tables with short primary key
Enabled sort-with-data for MyISAM temporary files
BitKeeper/etc/ignore:
added tools/mysqltestmanager
client/mysqltest.c:
Ensure that BIG_TEST is always set to 0 or 1
Fix the 'eval' also honors 'require'
mysql-test/mysql-test-run.sh:
Enlarge InnoDB table space for --big tests
mysql-test/r/heap.result:
Fix after adding more optimzation for filsort
mysql-test/r/sum_distinct.result:
Move 'slow' part of test to sum_distinct-big.test
mysql-test/t/heap.test:
Ensure that results are indpendent of optimizer
mysql-test/t/sum_distinct.test:
Move 'slow' part of test to sum_distinct-big.test
sql/filesort.cc:
Use 'sort with data' also on temporary files and with INSERT ... SELECT
sql/ha_innodb.h:
Remove HA_FAST_KEY_READ to enable buffered-record-reads after filesort
sql/handler.h:
More comments
sql/mysql_priv.h:
A bit smaller limit for cache for buffered-records-read (after testing)
sql/records.cc:
Don't use buffered-record-reads if ref_length > MAX_REFLENGTH
Fixed warning from valgrind in 'sum_distinct'
sql/sql_select.cc:
Ensure that tempory tables has query_id set for all fields
(Required for sort-with-data to work on temp files)
sql/sql_select.cc:
Fix a discrepancy spotted after the setup_end_select_func patch has been
pushed: last join sweep assumes that join->tmp_table is zero.
sql/sql_select.cc:
Bits of refactoring of do_select as one step forward to merge cursor and
non-cursor execution.
Moving send_fields (metadata handling) out of do_select to one level up
and moving end_select setting to a separate function.
This function is used in the Cursor::open() too.
"Early NULL-values filtering for ref access" (attempt2+post-review fixes)
1. update_ref_and_keys() accumulates info about null-rejecting
predicates in in KEY_FIELD::null_rejecting, add_key_part saves
these to KEYUSE.
2. create_ref_for_key copies them to TABLE_REF.
3. add_not_null_conds adds "x IS NOT NULL" to join_tab->select_cond of
appropiate JOIN_TAB members.
Includes code cleanups:
* add_key_field() params: s/COND/Item_func/ (as only Item_funcs are
passed to it)
* add_key_fields() params: JOIN_TAB *stat removed (wasn't used)
sql/sql_select.cc:
Fix for BUG#8877: Implementation of
"Early NULL-values filtering for ref access"
1. update_ref_and_keys() accumulates info about null-rejecting
predicates in in KEY_FIELD::null_rejecting, add_key_part saves
these to KEYUSE.
2. create_ref_for_key copies them to TABLE_REF.
3. add_not_null_conds adds "x IS NOT NULL" to join_tab->select_cond
of appropiate JOIN_TAB members.
Includes code cleanups:
* add_key_field() params: s/COND/Item_func/ (as only Item_funcs are
passed to it)
* add_key_fields() params: JOIN_TAB *stat removed (wasn't used)
sql/sql_select.h:
Fix for BUG#8877: Implementation of
"Early NULL-values filtering for ref access" (attempt2)
mysql-test/r/ps_1general.result:
Auto merged
mysql-test/t/ps_1general.test:
Auto merged
mysql-test/t/type_ranges.test:
Auto merged
sql/sql_parse.cc:
Auto merged
sql/sql_select.cc:
Auto merged
mysql-test/r/type_ranges.result:
Update results
mysql-test/r/innodb.result:
Auto merged
BitKeeper/deleted/.del-select.result.es~240635f6a3f1a079:
Auto merged
BitKeeper/deleted/.del-type_float.result.es~a5533e4118eadc04:
Auto merged
BitKeeper/deleted/.del-type_ranges.result.es~bb77517f4c9dc978:
Auto merged
mysql-test/r/type_float.result:
Auto merged
mysql-test/r/variables.result:
Auto merged
mysql-test/t/alter_table.test:
Auto merged
mysql-test/t/connect.test:
Auto merged
mysql-test/t/grant2.test:
Auto merged
mysql-test/t/grant_cache.test:
Auto merged
mysql-test/t/innodb.test:
Auto merged
mysql-test/t/mix_innodb_myisam_binlog.test:
Auto merged
mysql-test/t/mysqlbinlog.test:
Auto merged
mysql-test/t/mysqlbinlog2.test:
Auto merged
mysql-test/t/mysqldump.test:
Auto merged
mysql-test/t/ps_1general.test:
Auto merged
mysql-test/t/select.test:
Auto merged
mysql-test/t/show_check.test:
Auto merged
mysql-test/t/system_mysql_db_fix.test:
Auto merged
mysql-test/t/type_blob.test:
Auto merged
mysql-test/t/type_float.test:
Auto merged
mysql-test/t/variables.test:
Auto merged
sql/sql_parse.cc:
Auto merged
sql/sql_select.cc:
Auto merged
mysql-test/mysql-test-run.sh:
Merge
mysql-test/r/alter_table.result:
Update results
mysql-test/r/ctype_ucs.result:
Update results
mysql-test/r/grant.result:
Update results
mysql-test/r/insert_select.result:
Update results
mysql-test/r/ps_1general.result:
Update results
mysql-test/r/select.result:
Update results
mysql-test/r/timezone2.result:
Update results
mysql-test/r/type_blob.result:
Update results
mysql-test/r/type_ranges.result:
Update results
mysql-test/r/user_var.result:
Update results
mysql-test/t/ctype_ucs.test:
Merge
mysql-test/t/grant.test:
Merge
mysql-test/t/insert_select.test:
Merge
mysql-test/t/timezone2.test:
Merge
mysql-test/t/type_ranges.test:
Merge
mysql-test/t/user_var.test:
Merge
mysql-test/r/ctype_ucs.result:
Auto merged
mysql-test/r/ps_1general.result:
Auto merged
mysql-test/r/select.result:
Auto merged
mysql-test/r/type_blob.result:
Auto merged
mysql-test/r/type_float.result:
Auto merged
mysql-test/r/user_var.result:
Auto merged
mysql-test/r/variables.result:
Auto merged
mysql-test/t/ctype_ucs.test:
Auto merged
mysql-test/t/grant2.test:
Auto merged
mysql-test/t/mysqldump.test:
Auto merged
mysql-test/t/select.test:
Auto merged
mysql-test/t/show_check.test:
Auto merged
mysql-test/t/type_float.test:
Auto merged
mysql-test/t/user_var.test:
Auto merged
mysql-test/t/variables.test:
Auto merged
sql/sql_select.cc:
Auto merged
mysql-test/mysql-test-run.sh:
Merge changes
mysql-test/t/ps_1general.test:
Merge changes
into sanja.is.com.ua:/home/bell/mysql/bk/work-multi-5.0
mysql-test/r/view.result:
Auto merged
sql/sql_derived.cc:
Auto merged
sql/sql_lex.h:
Auto merged
sql/sql_parse.cc:
Auto merged
sql/sql_prepare.cc:
Auto merged
sql/sql_select.cc:
Auto merged
mysql-test/r/group_by.result:
Auto merged
ndb/src/kernel/blocks/dbacc/DbaccMain.cpp:
Auto merged
scripts/make_win_src_distribution.sh:
Auto merged
sql/item.cc:
Auto merged
sql/item.h:
Auto merged
sql/item_subselect.h:
Auto merged
sql/sql_select.cc:
Auto merged
ndb/src/kernel/blocks/dbdict/Dbdict.cpp:
merge
sql/item_cmpfunc.cc:
merge
support-files/mysql.server.sh:
merge
mysql-test/r/group_by.result:
Auto merged
mysql-test/r/metadata.result:
Auto merged
mysql-test/r/union.result:
Auto merged
mysql-test/t/union.test:
Auto merged
sql/item.h:
Auto merged
sql/sql_parse.cc:
Auto merged
sql/sql_select.cc:
Auto merged
support-files/mysql.server.sh:
Auto merged
up a couple of tests and adjusting the output of others. Exposes two
bugs (9472 and 9508).
BitKeeper/deleted/.del-drop_temp_table.result.es~bc4cfb1ee1257458:
Delete: mysql-test/r/drop_temp_table.result.es
BitKeeper/deleted/.del-insert_select.result.es~ae7eb9891d6c07c4:
Delete: mysql-test/r/insert_select.result.es
BitKeeper/deleted/.del-myisam-blob.result.es~d498dae7d9f1a6d4:
Delete: mysql-test/r/myisam-blob.result.es
BitKeeper/deleted/.del-packet.result.es~6e71c3b634806185:
Delete: mysql-test/r/packet.result.es
BitKeeper/deleted/.del-query_cache.result.es~246ad731a517d9ab:
Delete: mysql-test/r/query_cache.result.es
BitKeeper/deleted/.del-select.result.es~240635f6a3f1a079:
Delete: mysql-test/r/select.result.es
BitKeeper/deleted/.del-type_blob.result.es~a4a0d4454b2d0218:
Delete: mysql-test/r/type_blob.result.es
BitKeeper/deleted/.del-type_float.result.es~a5533e4118eadc04:
Delete: mysql-test/r/type_float.result.es
BitKeeper/deleted/.del-type_ranges.result.es~bb77517f4c9dc978:
Delete: mysql-test/r/type_ranges.result.es
mysql-test/mysql-test-run.sh:
Remove support for special result extension -- bad idea!
mysql-test/t/ps_1general.test:
Explain --replace_result
mysql-test/r/insert_select.result:
Update results
mysql-test/r/select.result:
Update results
mysql-test/r/type_blob.result:
Update results
mysql-test/r/type_float.result:
Update results
mysql-test/r/type_ranges.result:
Update results
mysql-test/t/drop_temp_table.test:
Skip this test with embedded server
mysql-test/t/insert_select.test:
Move binlog test to new file
mysql-test/t/select.test:
Replace grants column from 'show full columns'
mysql-test/t/type_blob.test:
Replace grants column from 'show full columns'
mysql-test/t/type_float.test:
Replace grants column from 'show full columns'
mysql-test/t/type_ranges.test:
Replace grants column from 'show full columns'
sql/sql_select.cc:
Fix conditional around query_cache_abort() call.
Make test_if_skip_sort_order() rebuild tab->ref if it decides to use an index
different from the index join optimizer has choosen.
mysql-test/r/group_by.result:
Testcase for BUG#9213
mysql-test/t/group_by.test:
Testcase for BUG#9213
sql/table.h:
Added comments about TABLE::used_keys
sql/sql_select.cc:
A fix (bug #9401: type_timestamp segfaults mysqld).
1. create_tmp_field_from_field() is modified to take 'Item_ref *item' and 'char *name'
instead of 'bool modify_item' and 'Item *item'.
2. For Item_sum_min/max we should never modify item, so NULL is
passed as item to the create_tmp_field_from_field().
