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Re: preliminary: logical column order

From: Andreas Pflug <pgadmin(at)pse-consulting(dot)de>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>,PostgreSQL Patches <pgsql-patches(at)postgresql(dot)org>
Subject: Re: preliminary: logical column order
Date: 2003-11-30 16:33:45
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-patches
I wonder if it wouldn't be easier to reorder the TupDesc->attrs[] array
according to an attphysid when filling the TupDesc structure, right
after a column was dropped/recreated (before any indexes/constraints are
recreated), so attnum remains, while storage changes.


attnum   attphysid  attname attisdropped

1         1         foo           f
2         2         bar           f

after drop/recreate col:
1         3         foo           f
2         2         bar           f
3         1         foo_del       t

resulting in an attrs array
attrs[0] describing physical col 3
attrs[1] describing physical col 2
attrs[2] describing physical col 1


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