On 08/15/13 16:59, Adrian Klaver napisa:
> On 08/15/2013 07:53 AM, Ivan Radovanovic wrote:
>
>>>>
>>>> Now I just need to find out which types can be indexed (and which types
>>>> can be part of PK)
>>>
>>> http://www.postgresql.org/docs/9.2/interactive/indexes.html
>>>
>>
>> doesn't list which types can be indexed and which can't?
>
> Postgres can handle a variety of indexes including indexing on
> expressions, which is why I pointed you to that link.
>
> To cut to the chase, in the above link at:
>
> http://www.postgresql.org/docs/9.2/interactive/indexes-opclass.html
>
> there is this:
>
> SELECT am.amname AS index_method,
> opf.opfname AS opfamily_name,
> amop.amopopr::regoperator AS opfamily_operator
> FROM pg_am am, pg_opfamily opf, pg_amop amop
> WHERE opf.opfmethod = am.oid AND
> amop.amopfamily = opf.oid
> ORDER BY index_method, opfamily_name, opfamily_operator;
>>
>>
Thanks Adrian, but question was how to decide which types are indexable
- query which you sent returns list of operators defined for some types
- for example it returns operators for bytea too, and you can't index by
bytea, so I don't see how you could decide if type can be indexed based
on this?