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updating a string session variable from a storage engine


i have a MYSQL_THDVAR_STR session variable in my storage engine.  i
want to update its value from the storage engine.  it was suggested
that i use "THDVAR(x)=new_value" to do it.  i noticed that
update_func_str is NOT called, so i wonder about the contract.  is the
caller responsible for memory management?  i used PLUGIN_VAR_MEMALLOC
for the var def.


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