Before this fix, a call to a User Defined Function (UDF) could,
under some circumstances, be interpreted as a call to a Stored function
instead. This occurred if a native function was invoked in the parameters
for the UDF, as in "select my_udf(abs(x))".

The root cause of this defect is the introduction, by the fix for Bug 21809,
of st_select_lex::udf_list, and it's usage in the parser in sql_yacc.yy
in the rule function_call_generic (in 5.1).

While the fix itself for Bug 21809 is correct in 5.0, the code change
merged into the 5.1 release created the issue, because the calls in 5.1 to :
- lex->current_select->udf_list.push_front(udf)
- lex->current_select->udf_list.pop()
are not balanced in case of native functions, causing the udf_list,
which is really a stack, to be out of sync with the internal stack
maintained by the bison parser.

Instead of moving the call to udf_list.pop(), which would have fixed the
symptom, this patch goes further and removes the need for udf_list.

This is motivated by two reasons:

a) Maintaining a stack in the MySQL code in sync with the stack maintained
internally in sql_yacc.cc (not .yy) is extremely dependent of the
implementation of yacc/bison, and extremely difficult to maintain.
It's also totally dependent of the structure of the grammar, and has a risk
to break with regression defects each time the grammar itself is changed.

b) The previous code did report construct like "foo(expr AS name)" as
syntax errors (ER_PARSER_ERROR), which is incorrect, and misleading.
The syntax is perfectly valid, as this expression is valid when "foo" is
a UDF. Whether this syntax is legal or not depends of the semantic of "foo".

With this change:

a) There is only one stack (in bison), and no List<udf_func> to maintain.

b) "foo(expr AS name)", when used incorrectly, is reported as semantic error:
- ER_WRONG_PARAMETERS_TO_NATIVE_FCT (for native functions)
- ER_WRONG_PARAMETERS_TO_STORED_FCT (for stored functions)
This is achieved by the changes implemented in item_create.cc


mysql-test/r/parser.result:
  New tests
mysql-test/r/udf.result:
  New tests
mysql-test/t/parser.test:
  New tests
mysql-test/t/udf.test:
  New tests
sql/item_create.cc:
  Semantic checks for named parameters, as in "foo(expr AS name)".
sql/share/errmsg.txt:
  New error message
sql/sql_lex.cc:
  Remove usage of udf_list.
sql/sql_lex.h:
  Remove usage of udf_list.
sql/sql_yacc.yy:
  Remove usage of udf_list.

into  neptunus.(none):/home/msvensson/mysql/mysql-5.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged
mysys/my_getopt.c:
  Auto merged
scripts/mysql_fix_privilege_tables.sql:
  Merge change "--" to "#"

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0-maint


mysql-test/mysql-test-run.pl:
  Auto merged
mysys/my_getopt.c:
  Auto merged

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0-maint

into  neptunus.(none):/home/msvensson/mysql/mysql-5.1-maint


mysql-test/Makefile.am:
  Auto merged

into  neptunus.(none):/home/msvensson/mysql/mysql-5.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged
mysql-test/r/mysqltest.result:
  Auto merged
mysql-test/t/mysqltest.test:
  Auto merged
sql/handler.cc:
  Auto merged
sql/sql_parse.cc:
  Auto merged
client/mysqltest.c:
  Manual merge
mysql-test/r/rpl_sp.result:
  Manual merge
mysql-test/t/rpl_sp.test:
  Manual merge

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0-maint


mysql-test/mysql-test-run.pl:
  Auto merged
mysql-test/t/mysqltest.test:
  Auto merged
client/mysqltest.c:
  Manual merge
mysql-test/r/mysqltest.result:
  Manual merge

into  neptunus.(none):/home/msvensson/mysql/mysql-5.1-maint


client/mysqltest.c:
  Auto merged
mysql-test/r/func_misc.result:
  Auto merged
mysql-test/r/mysql.result:
  Auto merged
mysql-test/t/mysql.test:
  Auto merged
sql/field_conv.cc:
  Auto merged
sql/handler.cc:
  Auto merged
sql/sql_parse.cc:
  Auto merged

into  neptunus.(none):/home/msvensson/mysql/mysql-5.1-maint


mysql-test/r/mysqltest.result:
  Auto merged
mysql-test/t/mysqltest.test:
  Auto merged
sql/handler.cc:
  Auto merged
client/mysqltest.c:
  Manual merge

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0-maint


mysql-test/r/mysqltest.result:
  Auto merged
mysql-test/t/mysqltest.test:
  Auto merged
sql/handler.cc:
  Auto merged
client/mysqltest.c:
  Manual merge

into  neptunus.(none):/home/msvensson/mysql/bug19731/my51-bug19731


client/mysqltest.c:
  Auto merged
mysql-test/r/mysqltest.result:
  Auto merged
mysql-test/r/varbinary.result:
  Auto merged
mysql-test/t/mysqltest.test:
  Auto merged
sql/field_conv.cc:
  Auto merged
sql/handler.cc:
  Auto merged

 - chmod the saved files from 4.1 to make sure they are writable


mysql-test/t/varbinary.test:
  As the files saved from 4.1 has been in bk they muight be readonly
  Use "chmod" to make sure they are writable

client/mysqltest.c:
  Add "chmod" command
mysql-test/r/mysqltest.result:
  Update result file
mysql-test/t/mysqltest.test:
  Add tests for chmod

into  shellback.(none):/home/msvensson/mysql/mysql-5.1-merge-from5.0-maint


BitKeeper/etc/ignore:
  auto-union
client/mysql.cc:
  Auto merged
mysql-test/lib/mtr_process.pl:
  Auto merged
mysql-test/lib/mtr_report.pl:
  Auto merged
mysql-test/mysql-test-run.pl:
  Auto merged
mysql-test/r/func_misc.result:
  Auto merged
mysql-test/r/mysql.result:
  Auto merged
mysql-test/r/rpl_000015.result:
  Auto merged
mysql-test/t/mysql.test:
  Auto merged
mysql-test/t/rpl_000015.test:
  Auto merged
sql-common/my_time.c:
  Auto merged
sql/item_func.h:
  Auto merged
sql/item_timefunc.cc:
  Auto merged
sql/mysqld.cc:
  Auto merged
sql/sql_parse.cc:
  Auto merged

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0-maint


mysql-test/mysql-test-run.pl:
  Auto merged

into  neptunus.(none):/home/msvensson/mysql/work/my51-work


mysql-test/mysql-test-run.pl:
  Auto merged

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged

into  neptunus.(none):/home/msvensson/mysql/work/my50-work


mysql-test/mysql-test-run.pl:
  Auto merged

mysql-test/std_data/bug19371.frm:
  Change mode to -rw-rw--w-
mysql-test/std_data/bug19371.MYD:
  Change mode to -rw-rw--w-
mysql-test/std_data/bug19371.MYI:
  Change mode to -rw-rw--w-

into  shellback.(none):/home/msvensson/mysql/mysql-5.1-merge-from5.0-maint


BitKeeper/etc/collapsed:
  auto-union
BitKeeper/etc/ignore:
  auto-union
Docs/Makefile.am:
  Auto merged
Makefile.am:
  Auto merged
client/mysqltest.c:
  Auto merged
extra/yassl/src/ssl.cpp:
  Auto merged
include/my_sys.h:
  Auto merged
mysql-test/Makefile.am:
  Auto merged
mysql-test/mysql-test-run-shell.sh:
  Auto merged
mysql-test/extra/rpl_tests/rpl_deadlock.test:
  Auto merged
mysql-test/lib/mtr_process.pl:
  Auto merged
mysql-test/lib/mtr_report.pl:
  Auto merged
mysql-test/mysql-test-run.pl:
  Auto merged
mysql-test/r/func_time.result:
  Auto merged
mysql-test/r/rpl_000015.result:
  Auto merged
mysql-test/r/rpl_deadlock_innodb.result:
  Auto merged
mysql-test/r/udf.result:
  Auto merged
mysql-test/t/func_time.test:
  Auto merged
mysql-test/t/limit.test:
  Auto merged
mysql-test/t/mysql.test:
  Auto merged
mysql-test/t/rpl_000015.test:
  Auto merged
mysql-test/t/udf.test:
  Auto merged
mysql-test/t/view_grant.test:
  Auto merged
sql/item.cc:
  Auto merged
sql/item_func.cc:
  Auto merged
sql/item_func.h:
  Auto merged
sql/item_timefunc.cc:
  Auto merged
sql/mysql_priv.h:
  Auto merged
sql/mysqld.cc:
  Auto merged
sql-common/my_time.c:
  Auto merged
sql/sql_base.cc:
  Auto merged
sql/sql_parse.cc:
  Auto merged
sql/sql_table.cc:
  Auto merged

into  shellback.(none):/home/msvensson/mysql/mysql-5.1-merge-from5.0-maint


client/mysql_upgrade.c:
  Auto merged
configure.in:
  Auto merged
mysql-test/lib/mtr_report.pl:
  Auto merged
mysql-test/mysql-test-run.pl:
  Auto merged
sql/item_timefunc.cc:
  Auto merged
sql-common/my_time.c:
  Auto merged
sql/sql_parse.cc:
  Auto merged
support-files/mysql.spec.sh:
  Auto merged
include/my_sys.h:
  Manual merge - my_getpagesize defined further down separate from HAVE_SYS_MMAN_H

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.1-maint


mysql-test/r/func_misc.result:
  Auto merged

mysql-test/r/func_misc.result:
  case change in SHOW CREATE keywords.
mysql-test/r/mysql.result:
  Revert clobber of charset special chars.
mysql-test/t/mysql.test:
  Revert clobber of charset special chars.

  Changed paths to ndb include directory to include "storage"
Makefile.am:
  Adjusted path to yaSSL libtool libraries
ssl.m4:
  Use libtool way of specifying yaSSL libraries


config/ac-macros/ssl.m4:
  Use libtool way of specifying yaSSL libraries
libmysqld/Makefile.am:
  Adjusted path to yaSSL libtool libraries
storage/ndb/config/type_kernel.mk.am:
  Changed paths to ndb include directory to include "storage"
storage/ndb/config/type_ndbapi.mk.am:
  Changed paths to ndb include directory to include "storage"
storage/ndb/config/type_ndbapitest.mk.am:
  Changed paths to ndb include directory to include "storage"
storage/ndb/config/type_ndbapitools.mk.am:
  Changed paths to ndb include directory to include "storage"
storage/ndb/config/type_util.mk.am:
  Changed paths to ndb include directory to include "storage"

into  shellback.(none):/home/msvensson/mysql/mysql-5.1-maint


BitKeeper/etc/ignore:
  auto-union
Makefile.am:
  Auto merged
client/mysql.cc:
  Auto merged
client/mysql_upgrade.c:
  Auto merged
client/mysqltest.c:
  Auto merged
extra/yassl/src/ssl.cpp:
  Auto merged
mysql-test/lib/mtr_report.pl:
  Auto merged
mysql-test/mysql-test-run-shell.sh:
  Auto merged
mysql-test/mysql-test-run.pl:
  Auto merged
mysql-test/r/query_cache.result:
  Auto merged
mysql-test/r/udf.result:
  Auto merged
mysql-test/t/alter_table.test:
  Auto merged
mysql-test/t/disabled.def:
  Auto merged
mysql-test/t/limit.test:
  Auto merged
mysql-test/t/mysql.test:
  Auto merged
mysql-test/t/mysqldump.test:
  Auto merged
mysql-test/t/query_cache.test:
  Auto merged
mysql-test/t/system_mysql_db_fix30020.test:
  Auto merged
mysql-test/t/udf.test:
  Auto merged
mysql-test/t/view_grant.test:
  Auto merged
mysys/Makefile.am:
  Auto merged
scripts/mysql_fix_privilege_tables.sql:
  Auto merged
sql/item.cc:
  Auto merged
sql/item_func.cc:
  Auto merged
sql/item_func.h:
  Auto merged
sql/item_timefunc.cc:
  Auto merged
sql/mysql_priv.h:
  Auto merged
sql/mysqld.cc:
  Auto merged
sql/sql_handler.cc:
  Auto merged
sql/sql_parse.cc:
  Auto merged
sql-common/my_time.c:
  Auto merged
sql/sql_table.cc:
  Auto merged
extra/yassl/taocrypt/include/algebra.hpp:
  Remove fix as it conflicts with "import from yassl" and it's been
  fixed there
sql/ha_ndbcluster.cc:
  Merge fix of warnings
sql/sql_base.cc:
  Merge

into  mysql.com:/home/kent/bk/mysql-5.1-build


Docs/Makefile.am:
  Auto merged
extra/yassl/taocrypt/benchmark/benchmark.dsp:
  Auto merged
extra/yassl/taocrypt/taocrypt.dsp:
  Auto merged
extra/yassl/taocrypt/taocrypt.vcproj:
  Auto merged
extra/yassl/taocrypt/test.dsp:
  Auto merged
extra/yassl/testsuite/testsuite.dsp:
  Auto merged
extra/yassl/yassl.dsp:
  Auto merged
extra/yassl/yassl.vcproj:
  Auto merged
libmysql/libmysql.c:
  Auto merged
mysql-test/mysql-test-run.pl:
  Auto merged
mysql-test/t/subselect.test:
  Auto merged
mysql-test/t/type_newdecimal.test:
  Auto merged
sql/Makefile.am:
  Auto merged
sql/filesort.cc:
  Auto merged
sql/handler.cc:
  Auto merged
sql/item_cmpfunc.cc:
  Auto merged
sql/item_subselect.cc:
  Auto merged
sql/item_timefunc.cc:
  Auto merged
sql/sql_class.h:
  Auto merged
sql/sql_parse.cc:
  Auto merged
sql-common/client.c:
  Auto merged
sql-common/my_time.c:
  Auto merged
sql/sql_select.cc:
  Auto merged
sql/table.cc:
  Auto merged
strings/decimal.c:
  Auto merged

into  mysql.com:/home/kent/bk/mysql-5.1-build


sql-common/my_time.c:
  Auto merged

into  mysql.com:/home/kent/bk/mysql-5.1-build


mysql-test/mysql-test-run.pl:
  Auto merged

into  mysql.com:/home/kent/bk/mysql-5.0-build

into  kpdesk.mysql.com:/home/thek/dev/mysql-5.1-maint


sql/sql_parse.cc:
  Auto merged

into  kpdesk.mysql.com:/home/thek/dev/mysql-5.0-maint

into  kpdesk.mysql.com:/home/thek/dev/mysql-5.0-maint


sql/sql_parse.cc:
  Auto merged
mysql-test/r/rpl_sp.result:
  - merged
mysql-test/t/rpl_sp.test:
  -merged

into  shellback.(none):/home/msvensson/mysql/yassl_import/mysql-5.0-maint


extra/yassl/src/ssl.cpp:
  Auto merged