| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Itagaki Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> |
| Cc: | David Fetter <david(at)fetter(dot)org>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Triggers on columns |
| Date: | 2009-09-03 05:04:56 |
| Message-ID: | 8111.1251954296@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Itagaki Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> writes:
> But how? First, I tried to use existing dependency mechanism:
> ObjectAddress referenced;
> referenced.classId = AttributeRelationId;
> referenced.objectId = {relid};
> referenced.objectSubId = {attnum};
This is just wrong. The correct representation of a column is
classId = RelationRelationId
objectId = relid
objectSubId = attnum
The column is a sub-object of a pg_class item, not an object in
its own right.
regards, tom lane
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