Re: TEXT vs PG_NODE_TREE in system columns (cross column and expression statistics patch)

Alvaro Herrera <alvherre@commandprompt.com> writes:
> Excerpts from Boszormenyi Zoltan's message of jue abr 28 11:03:56 -0300 2011:
>> ERROR:  could not determine which collation to use for string comparison
>> HINT:  Use the COLLATE clause to set the collation explicitly.

> Maybe the pg_node_tree problem is a bug with the collation feature.  If
> you could reproduce it in unpatched master, I'm sure it'd find a quick
> death.

Actually, I rather imagine it comes from this choice in catcache.c:
       /* Currently, there are no catcaches on collation-aware data types */       cache->cc_skey[i].sk_collation =
InvalidOid;

I'd be more worried about that if I thought it made any sense to use
a pg_node_tree column as an index key, but I don't ...
        regards, tom lane