prepared statement and subquery.

When a field of a view from an outer select is resolved the find_field_in_view
function creates an Item_direct_view_ref object that references the 
corresponding view underlying field. After that the view_ref is marked
as a dependent one. While resolving view underlying field it also get
marked as a dependent one due to current_select still points to the subselect.
Marking the view underlying field is wrong and lead to attaching conditions
to a wrong table and thus to the wrong result of the whole statement.

Now mark_select_range_as_dependent() function isn't called for fields from a 
view underlying table.


sql/sql_base.cc:
  Bug#20327: Marking of a wrong field leads to a wrong result on select with view, prepared statement and subquery.
  
  Now mark_select_range_as_dependent() function isn't called for fields from a
  view underlying table.
mysql-test/r/ps.result:
  Added a test case for bug#20327: Marking of a wrong field leads to a wrong result on select with view, prepared statement and subquery.
mysql-test/t/ps.test:
  Added a test case for bug#20327: Marking of a wrong field leads to a wrong result on select with view,prepared statement and subquery.

into  rakia.gmz:/home/kgeorge/mysql/autopush/B20191-5.0-opt


sql/sql_select.cc:
  Auto merged

When compiling GROUP BY Item_ref instances are dereferenced in 
setup_copy_fields(), i.e. replaced with the corresponding Item_field 
(if they point to one) or Item_copy_string for the other cases.
Since the Item_ref (in the Item_field case) is no longer used the information
about the aliases stored in it is lost.   
Fixed by preserving the column, table and DB alias on dereferencing Item_ref


mysql-test/r/metadata.result:
  Bug #20191: getTableName gives wrong or inconsistent result when using VIEWs
   - test case
mysql-test/t/metadata.test:
  Bug #20191: getTableName gives wrong or inconsistent result when using VIEWs
   - test case
sql/item.cc:
  Bug #20191: getTableName gives wrong or inconsistent result when using VIEWs
   - use the table and db name to fill up the metadata for columns
sql/sql_select.cc:
  Bug #20191: getTableName gives wrong or inconsistent result when using VIEWs
   - preserve the field, table and DB name on dereferencing an Item_ref

into  mysql.com:/home/hf/work/8663/my50-8663

into  macbook.gmz:/Users/kgeorge/mysql/work/mem-test-5.0-opt


Makefile.am:
  merge fixes

into  mysql.com:/home/psergey/mysql-5.0-bug8804-pfix

Don't assume that condition that was pushed down into subquery has 
produced exactly one KEY_FIELD element - it could produce several or
none at all, handle all of those cases.

into  rakia.gmz:/home/kgeorge/mysql/autopush/B11032-5.0-opt

into  mysql.com:/home/hf/work/mysql-5.0.clean

sql/field.cc:
  datatime length is 19, not 12

into  macbook.gmz:/Users/kgeorge/mysql/work/B11032-5.0-opt


mysql-test/r/subselect.result:
  merge fixes
mysql-test/t/subselect.test:
  merge fixes
sql/item_subselect.cc:
  merge fixes
sql/item_subselect.h:
  merge fixes

 - When returning metadata for scalar subqueries the actual type of the
   column was calculated based on the value type, which limits the actual
   type of a scalar subselect to the set of (currently) 3 basic types : 
   integer, double precision or string. This is the reason that columns
   of types other then the basic ones (e.g. date/time) are reported as
   being of the corresponding basic type.
   Fixed by storing/returning information for the column type in addition
   to the result type.


mysql-test/r/subselect.result:
  Bug #11032: getObject() returns a String for a sub-query of type datetime
   - test case
mysql-test/t/subselect.test:
  Bug #11032: getObject() returns a String for a sub-query of type datetime
   - test case
sql/item_subselect.cc:
  Bug #11032: getObject() returns a String for a sub-query of type datetime
   - store and return the field type as well in addition to result type for 
     single row subqueries
sql/item_subselect.h:
  Bug #11032: getObject() returns a String for a sub-query of type datetime
   - store and return the field type as well in addition to result type for 
     single row subqueries

  merge fixes


sql/item.cc:
  merge fixes

into  dl145s.mysql.com:/data/bk/team_tree_merge/MERGE/mysql-5.0-opt


sql/item.cc:
  Auto merged
mysql-test/r/order_by.result:
  SCCS merged

into  mysql.com:/home/hf/work/8663/my50-8663


mysql-test/r/gis-rtree.result:
  Auto merged

include/my_time.h:
  we need to use it outside the my_time.cc
mysql-test/r/gis-rtree.result:
  result fixed
sql-common/my_time.c:
  'static' removed
sql/field.cc:
  checks for invalid datetimes added

mysql-test/r/gis-rtree.result:
  merging fix

into  mysql.com:/home/hf/work/8663/my50-8663


mysql-test/r/type_newdecimal.result:
  merging
mysql-test/t/type_newdecimal.test:
  merging

into  mysql.com:/home/hf/work/8663/my50-8663


sql/item_func.cc:
  Auto merged

into  mysql.com:/home/hf/work/21790/my50-21790


mysql-test/t/gis-rtree.test:
  Auto merged
mysql-test/r/gis-rtree.result:
  merging

into  mysql.com:/home/hf/work/19491/my50-19491


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

 The parser is allocating Item_field for references by name in ORDER BY
 expressions. Such expressions however may point not only to Item_field 
 in the select list (or to a table column) but also to an arbitrary Item. 
 This causes Item_field::fix_fields to throw an error about missing 
 column.
 The fix substitutes Item_field for the reference with an Item_ref when 
 not pointing to Item_field.


mysql-test/r/order_by.result:
  Bug #22457: Column alias in ORDER BY works, but not if in an expression
   - test case
mysql-test/t/order_by.test:
  Bug #22457: Column alias in ORDER BY works, but not if in an expression
   - test case
sql/item.cc:
  Bug #22457: Column alias in ORDER BY works, but not if in an expression
   - transform the Item_field made by the parser into Item_ref if it 
     doesn't point to Item_field and it is in allowed context

into  rurik.mysql.com:/home/igor/dev-opt/mysql-5.0-opt-bug21727


mysql-test/r/subselect.result:
  Auto merged
mysql-test/t/subselect.test:
  Auto merged
sql/filesort.cc:
  Auto merged
sql/item_subselect.h:
  Auto merged
sql/mysql_priv.h:
  Auto merged
sql/records.cc:
  Auto merged
sql/sql_base.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
sql/sql_show.cc:
  Auto merged
sql/sql_table.cc:
  Auto merged
sql/table.cc:
  Auto merged

into  mysql.com:/home/hf/work/mysql-5.0.19491


sql/field.cc:
  Auto merged
sql/field.h:
  Auto merged
sql/item.cc:
  Auto merged
sql/item.h:
  Auto merged
sql/item_timefunc.cc:
  Auto merged

This is a performance issue for queries with subqueries evaluation
of which requires filesort.
Allocation of memory for the sort buffer at each evaluation of a
subquery may take a significant amount of time if the buffer is rather big.
With the fix we allocate the buffer at the first evaluation of the
subquery and reuse it at each subsequent evaluation.


mysql-test/r/subselect.result:
  Added a test case for bug #21727.
mysql-test/t/subselect.test:
  Added a test case for bug #21727.
sql/item_subselect.h:
  Fixed bug #21727.
  This is a performance issue for queries with subqueries evaluation
  of which requires filesort.
  Added an implementation for Item_subselect::is_uncacheable()
  returning TRUE if the engine if the subselect is uncacheable.
sql/mysql_priv.h:
  Fixed bug #21727.
  This is a performance issue for queries with subqueries evaluation
  of which requires filesort.
  Added a new boolean parameter to the filesort_free_buffers procedure.
  If the value of this parameter is TRUE the procedure frees the sort_keys
  buffpek buffers.
sql/records.cc:
  Fixed bug #21727.
  This is a performance issue for queries with subqueries evaluation
  of which requires filesort.
  Added a new boolean parameter to the filesort_free_buffers procedure.
  If the value of this parameter is TRUE the procedure frees the sort_keys
  buffpek buffers.
sql/sql_base.cc:
  Fixed bug #21727.
  Made sure that st_table::pos_in_table_list would be always initialized.
sql/sql_select.cc:
  Fixed bug #21727.
  This is a performance issue for queries with subqueries evaluation
  of which requires filesort.
  Added a new boolean parameter to the filesort_free_buffers procedure.
  If the value of this parameter is TRUE the procedure frees the sort_keys
  buffpek buffers.
sql/sql_show.cc:
  Fixed bug #21727.
  This is a performance issue for queries with subqueries evaluation
  of which requires filesort.
  Added a new boolean parameter to the filesort_free_buffers procedure.
  If the value of this parameter is TRUE the procedure frees the sort_keys
  buffpek buffers.
sql/sql_table.cc:
  Fixed bug #21727.
  This is a performance issue for queries with subqueries evaluation
  of which requires filesort.
  Cleanup.
sql/table.cc:
  Fixed bug #21727.
  This is a performance issue for queries with subqueries evaluation
  of which requires filesort.
  Added st_table_list::in_subselect() returning for a table the subselect that 
  contains the FROM list this table is taken from (if there is any).
sql/table.h:
  Fixed bug #21727.
  This is a performance issue for queries with subqueries evaluation
  of which requires filesort.
  Added fields for sort_keys and buffpek buffers to the FILESORT_INFO structure.

into  mysql.com:/home/psergey/mysql-5.0-bug8804-r4


sql/sql_lex.cc:
  Auto merged
sql/sql_lex.h:
  Auto merged

- Better comments
- Remove redundant and dead code.

the fix. 

Evaluate "NULL IN (SELECT ...)" in a special way: Disable pushed-down 
conditions and their "consequences": 
 = Do full table scans instead of unique_[index_subquery] lookups.
 = Change appropriate "ref_or_null" accesses to full table scans in
   subquery's joins.
Also cache value of NULL IN (SELECT ...) if the SELECT is not correlated 
wrt any upper select.


mysql-test/r/subselect.result:
  BUG#8804: wrong results for NULL IN (SELECT ...): 
   - Updated test results
sql/item.h:
  BUG#8804: wrong results for NULL IN (SELECT ...): 
   - Added comments
sql/item_cmpfunc.cc:
  BUG#8804: wrong results for NULL IN (SELECT ...): 
  Made Item_in_optimizer to:
  - cache the value of "NULL IN (uncorrelated select)"
  - Turn off pushed-down predicates when evaluating "NULL IN (SELECT ...)"
sql/item_cmpfunc.h:
  BUG#8804: wrong results for NULL IN (SELECT ...): 
  - Made Item_in_optimizer cache the value of "NULL IN (uncorrelated select)"
  - Added comments
sql/item_subselect.cc:
  BUG#8804: wrong results for NULL IN (SELECT ...):
  - When needed, wrap the predicates we push into subquery into an 
    Item_func_trig_cond so we're able to turn them off when evaluating 
    NULL IN (SELECT ...).
  - Added code to evaluate NULL IN (SELECT ...) in a special way:
    = In [unique_]index_subquery, do full table scan to see if there 
      are any rows.
    = For other subqueries, change ref[_or_null] to ALL if the
      ref[_or_null] was created from pushed-down predicate.
sql/item_subselect.h:
  BUG#8804: wrong results for NULL IN (SELECT ...):
  - Added Item_subselect::is_correlated
  - Added comments
sql/records.cc:
  BUG#8804: wrong results for NULL IN (SELECT ...):
  - Make rr_sequential() non-static
sql/sql_lex.cc:
  BUG#8804: wrong results for NULL IN (SELECT ...):
  - Added st_select_lex::is_correlated and Item_subselect::is_correlated.
sql/sql_lex.h:
  BUG#8804: wrong results for NULL IN (SELECT ...):
  - Added st_select_lex::is_correlated
sql/sql_select.cc:
  BUG#8804: wrong results for NULL IN (SELECT ...):
  - Added KEY_FIELD::outer_ref to keep track of which ref accesses are 
    created from predicates that were pushed down into the subquery.
sql/sql_select.h:
  BUG#8804: wrong results for NULL IN (SELECT ...):
  - Added KEYUSE::outer_ref
mysql-test/r/subselect3.result:
  New BitKeeper file ``mysql-test/r/subselect3.result''
mysql-test/t/subselect3.test:
  New BitKeeper file ``mysql-test/t/subselect3.test''

into  mysql.com:/usersnfs/abotchkov/mysql-5.0-opt1

into  rakia.gmz:/home/kgeorge/mysql/autopush/B21809-5.0-opt


sql/item.cc:
  Auto merged
sql/item_func.cc:
  Auto merged
sql/item_func.h:
  Auto merged
sql/sql_lex.cc:
  Auto merged
sql/sql_lex.h:
  Auto merged

into  rakia.gmz:/home/kgeorge/mysql/autopush/B23184-5.0-opt

 Item::val_xxx() may be called by the server several times at execute time 
 for a single query. Calls to val_xxx() may be very expensive and sometimes
 (count(distinct), sum(distinct), avg(distinct)) not possible.
 To avoid that problem the results of calculation for these aggregate 
 functions are cached so that val_xxx() methods just return the calculated 
 value for the second and subsequent calls.


mysql-test/r/func_group.result:
  Bug #23184: SELECT causes server crash
   - test case
mysql-test/t/func_group.test:
  Bug #23184: SELECT causes server crash
   - test case
sql/item_sum.cc:
  Bug #23184: SELECT causes server crash
   - caching of the aggregate function results so no need to recalculate at val_xxx()
sql/item_sum.h:
  Bug #23184: SELECT causes server crash
   - caching of the aggregate function results so no need to recalculate at val_xxx()

decimal->ulong conversion fixed to assign max possible ULONG if decimal
is bigger
Item_func_unsigned now handles DECIMAL parameter separately as we can't
rely on decimal::val_int result here.


mysql-test/r/type_newdecimal.result:
  result fixed
mysql-test/t/type_newdecimal.test:
  testcase
sql/item_func.cc:
  DECIMAL_RESULT should be handled separately here as it's
  always signed.
strings/decimal.c:
  here we assign max possible ULONG if the decimal value is bigger

mysql-test/r/type_datetime.result:
  result fixed
mysql-test/r/type_newdecimal.result:
  result fixed
mysql-test/t/type_datetime.test:
  testcase
mysql-test/t/type_newdecimal.test:
  testcase
sql/field.cc:
  Field_new_decimal::store_time implemented
sql/field.h:
  Field_new_decimal::store_time added
sql/item.cc:
  auxiliary methods implemented to operate with datatimes
sql/item.h:
  auxiliary methods declared in Item to operate with datatimes
sql/item_timefunc.cc:
  Item_date::save_in_field old implementation removed
sql/item_timefunc.h:
  my_decimal and save_in_field methods implemented for datetime items
sql/my_decimal.cc:
  date2my_decimal implemented
sql/my_decimal.h:
  date2my_decimal declared

into  mysql.com:/usersnfs/abotchkov/mysql-4.1-opt1

into  mysql.com:/usersnfs/abotchkov/mysql-5.0-opt1

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