On 2014-06-20 16:50:15 -0400, Alvaro Herrera wrote:
> Tom Lane wrote:
> > The idea I'm toying with right now is to additionally mark as not nullable
> > any column referenced in a DECLARE_UNIQUE_INDEX command in
> > catalog/indexing.h.  But I've not looked through that set carefully; it's
> > conceivable that we actually have some indexed catalog columns that are
> > allowed to be null.  A possibly better solution is to invent a new macro
> > that has the same semantics as DECLARE_UNIQUE_INDEX, plus forcing the
> > columns to be marked NOT NULL.
> I think most, if not all, the unique indexes declared are part of a
> syscache.  I don't think we allow those to be null, so in effect those
> columns are already not nullable.
>  Non-unique indexes in indexing.h
> already bear a standard comment that they are not used for syscache.
> The only exception was added recently in f01d1ae3a104019:
> DECLARE_INDEX(pg_class_tblspc_relfilenode_index, 3455, on pg_class using 
> btree(reltablespace oid_ops, relfilenode oid_ops));

There's no NULLs in here. It can have duplicates, but in that it's far
from alone.


Andres Freund

 Andres Freund                     http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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