Hi guys,
Although, usually, we do not change the system catalog or modify the catalog schema, or adding a new system catalog, but in these system catalog head files, such as pg_xxx.h, i think we should use more meaningful variables. As we known, in pg_xxx.h files, we insert some initial values into system catalog, as following shown in pg_class.h.
DATA(insert OID = 1247 ( pg_type PGNSP 71 0 PGUID 0 0 0 0 0 0 0 f f p r 30 0 t f f f f f f t n 3 1 _null_ _null_ ));
DESCR("");
DATA(insert OID = 1249 ( pg_attribute PGNSP 75 0 PGUID 0 0 0 0 0 0 0 f f p r 21 0 f f f f f f f t n 3 1 _null_ _null_ ));
DESCR("");
It's a tedious work to figure out these numbers real meaning. for example, if i want to know the value of '71' represent what it is. I should go back to refer to definition of pg_class struct. It's a tedious work and it's not maintainable or readable. I THINK WE SHOULD USE a meaningful variable instead of '71'. For Example:
#define PG_TYPE_RELTYPE 71
Regards,
Hom.