- Don't delete anything if starting dirty

some rollup rows (rows with NULLs for grouping attributes) if GROUP BY
list contained constant expressions.

This happened because the results of constant expressions were not put
in the temporary table used for duplicate elimination. In fact a constant
item from the GROUP BY list of a ROLLUP query can be replaced for an
Item_null_result object when a rollup row is produced . 

Now the JOIN::rollup_init function wraps any constant item referenced in
the GROYP BY list of a ROLLUP query into an Item_func object of a special
class that is never detected as constant item. This ensures creation of
fields for such  constant items in temporary tables and guarantees right
results when the result of the rollup operation first has to be written
into a temporary table, e.g. in the cases when duplicate elimination is
required.  

into  mysql.com:/d2/hf/mrg/mysql-4.1-opt

into  gshchepa.loc:/home/uchum/work/bk-trees/mysql-4.1-opt-13191

INSERT...ON DUPLICATE KEY UPDATE may cause error 1032: 
"Can't find record in ..." if we are inserting into
InnoDB table unique index of partial key with
underlying UTF-8 string field.

This error occurs because INSERT...ON DUPLICATE uses a wrong
procedure to copy string fields of multi-byte character sets
for index search.

This bug occurs when error message length exceeds allowed limit: my_error()
function outputs "%s" sequences instead of long string arguments.

Formats like %-.64s are very common in errmsg.txt files, however my_error()
function simply ignores precision of those formats.

into  mysql.com:/home/svoj/devel/mysql/merge/mysql-4.1-engines

into  trift-lap.fambruehe:/MySQL/M41/push-4.1

into  mysql.com:/home/ram/work/b27515/b27515.4.1

into  mysql.com:/home/ram/work/b27515/b27515.4.1

into  quadxeon.mysql.com:/benchmarks/ext3/TOSAVE/tsmith/bk/maint/41

into  debian.(none):/M41/push-4.1

Support for NULL components was incomplete for row comparison,
fixed.  Added support for abort_on_null at compare_row() like
in 5.x

into  mysql.com:/home/svoj/devel/mysql/BUG24342/mysql-4.1-engines

into  siva.hindu.god:/home/tsmith/m/bk/maint/41

into  trift2.:/MySQL/M41/push-4.1

Added missed DROP privilege check on the original table for RENAME TABLE command.

into  mysql.com:/d2/hf/mrg/mysql-4.1-opt

IGNORE/USE/FORCE INDEX hints were honored when choosing FULLTEXT
index.

With this fix these hints are ignored. For regular indexes we may
perform table scan instead of index lookup when IGNORE INDEX was
specified. We cannot do this for FULLTEXT in NLQ mode.

into  whalegate.ndb.mysql.com:/home/tomas/mysql-4.1-opt

are used as arguments of the IN predicate.
Added a function to check compatibility of row expressions. Made sure that this
function to be called for Item_func_in objects by fix_length_and_dec().

into  perch.ndb.mysql.com:/home/jonas/src/mysql-4.1-ndb

into  perch.ndb.mysql.com:/home/jonas/src/mysql-4.1-ndb

  fix commit trigger on multi-update

into  mysql.com:/home/kent/bk/tmp3/mysql-4.1-build

MERGE engine may return incorrect values when several representations
of equal keys are present in the index. For example "groß" and "gross"
or "gross" and "gross " (trailing space), which are considered equal,
but have different lengths.

The problem was that key length was not recalculated after key lookup.

Only MERGE engine is affected.

into  pilot.blaudden:/home/msvensson/mysql/mysql-4.1-maint

into  pilot.blaudden:/home/msvensson/mysql/mysql-4.1-maint

into  trift2.:/MySQL/M41/push-4.1

into  mysql.com:/d2/hf/mrg/mysql-4.1-opt

Usage:
  query_sorted <query>;