[GENERAL] fmgr_info_cxt_security() modifies variable?

[Luis Vargas]

Hi, I'm calling an arbitrary user-defined function from the backend. 
Although I can do it via FunctionCallInvoke, I have a weird problem when 
calling fmgr_info. The call results in a argument variable (eventType) 
being cleared. A gdb hardware watch says that the variable is modified by 
this line (185) in fmgr.c: finfo->fn_extra = NULL; Any ideas of what is 
happening?
  
For simplicity, in the following snippet I have hardcoded foid to some 
(PGPSQL) function id and removed the rest of the call-related statements.

static void execEventTypeFunc(char *eventType, Oid funcId)
{
        FmgrInfo *finfo;
        FunctionCallInfoData fcinfo;
        Datum           result;
	Oid foid = 17283;  

        finfo = (FmgrInfo *) palloc0(sizeof(FmgrInfo));
	fmgr_info(foid, finfo);  

        ...
}

Thanks,

Luis

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