[HACKERS] Which func tells the tuple size of a given relation?

[John]

I am hacking the parser to do multi-class-classification. I am wondering 
which function can tell the size of a relation. I tried to do something like

          int row_sz = 0;
         pgstat_count_heap_fetch(&rel->pgstat_info);
         row_sz = ((PgStat_TableEntry 
*)((&rel->pgstat_info)->tabentry))->t_tuples_fetched;

But the system does not like it and the DB broke down halfway.

Thanks,
John 

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