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mariadb/sql
Anirudh Mangipudi b0ba04a800 Bug #12546953 "SHOW VARIABLES LIKE 'DATADIR';" RETURN EMPTY.
Problem:
===========================================================
If mysqld daemon is started without a --datadir option
option, and we issue the SHOW VARIABLES LIKE 'DATADIR';SQL command
at the client it returns an empty path. This is because
mysql_real_data_home_ptr is being reset to NULL by Sys_var_charptr
constructor call when the datadir is not given either through
configuration file (no-defaults) or through mysqld parameters.

Solution:
===========================================================
mysql_real_data_home is an array which stores the path of the datadir
and mysql_real_data_home_ptr is the pointer to it. The pointer is
being set to NULL at the Sys_datadir, which is of type Sys_var_charptr,
constructor call. This is because at Sys_datadir call the def_val 
parameter was being passed with DEFAULT(0) which is now replaced with
DEFAULT(mysql_real_data_home). The patch has been tested manually as it
is not possible to start mtr without a default config file.
2013-02-18 19:13:06 +05:30
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