Re: pg_class catalog question...

"Jonah H. Harris" <jonah.harris@gmail.com> writes:
> Does anyone know how to add a fixed-length char field to pg_class?

Changing any of the bootstrap catalogs is fairly tricky --- there are a
lot of places you have to update manually.  I'd suggest looking for a
previous commit that did something similar and studying the diff.
[ digs in CVS log... ]  Here are a couple of possibilities; the first
one is smaller but it's touching pg_proc not pg_class.

2005-03-29 14:44  tgl
* doc/src/sgml/bki.sgml, doc/src/sgml/catalogs.sgml,src/backend/bootstrap/bootstrap.c,
src/backend/catalog/pg_proc.c,src/include/catalog/catversion.h,src/include/catalog/pg_attribute.h,
src/include/catalog/pg_class.h,src/include/catalog/pg_proc.h:Add proallargtypes and proargmodescolumns to pg_proc, as
permy earlier proposal for OUT parametersupport.  The columns don't actually *do* anything yet, they arejust left
NULLs. But I thought I'd commit this part separately asa fairly pure example of the tasks needed when adding a column
topg_procor one of the other core system tables.
 

2002-03-26 14:15  tgl
* doc/src/sgml/catalogs.sgml,
src/backend/access/heap/heapam.c,src/backend/access/index/indexam.c,src/backend/bootstrap/bootparse.y,src/backend/bootstrap/bootstrap.c,
src/backend/catalog/Makefile,src/backend/catalog/aclchk.c,src/backend/catalog/genbki.sh,src/backend/catalog/heap.c,
src/backend/catalog/index.c,src/backend/catalog/indexing.c,
src/backend/catalog/namespace.c,src/backend/commands/cluster.c,
src/backend/commands/command.c,src/backend/commands/comment.c,
src/backend/commands/creatinh.c,src/backend/commands/indexcmds.c,
src/backend/commands/rename.c,src/backend/commands/trigger.c,
src/backend/commands/user.c,src/backend/executor/execMain.c,
src/backend/parser/analyze.c,src/backend/parser/parse_clause.c,src/backend/parser/parse_relation.c,src/backend/rewrite/rewriteDefine.c,
src/backend/tcop/utility.c,src/backend/utils/adt/acl.c,
src/backend/utils/cache/catcache.c,src/backend/utils/cache/lsyscache.c,src/backend/utils/cache/relcache.c,src/backend/utils/cache/syscache.c,
src/include/access/genam.h,src/include/access/heapam.h,
src/include/bootstrap/bootstrap.h,src/include/catalog/catversion.h,
src/include/catalog/heap.h,src/include/catalog/index.h,
src/include/catalog/indexing.h,src/include/catalog/namespace.h,src/include/catalog/pg_attribute.h,
src/include/catalog/pg_class.h,src/include/commands/cluster.h,
src/include/commands/command.h,src/include/commands/comment.h,
src/include/commands/defrem.h,src/include/commands/rename.h,
src/include/nodes/parsenodes.h,src/include/nodes/primnodes.h,
src/include/utils/catcache.h,src/include/utils/lsyscache.h,src/include/utils/rel.h,src/include/utils/relcache.h,
src/include/utils/syscache.h,src/pl/plpgsql/src/pl_comp.c:pg_class has a relnamespace column. You can create and access
tablesin schemas other than the systemnamespace; however, there's no search path yet, and not alloperations work yet on
tablesoutside the system namespace.
 
        regards, tom lane