Re: Slow select times on select with xpath

As a follow-up, when I try to create the index like this...

CREATE INDEX concurrently
idx_object_nodeid2
ON
object
USING
btree(
xpath('/a:root/a:Identification/b:ObjectId/text()', serialized_object,
ARRAY
[
ARRAY['a', 'http://schemas.datacontract.org/2004/07/Objects'],
ARRAY['b', 'http://schemas.datacontract.org/2004/07/Security']
])
) ;

The index begins to build but fails after about 90 seconds with this error:

ERROR: could not identify a comparison function for type xml
SQL state: 42883

Robert Haas wrote:
>
> On Thu, Sep 3, 2009 at 4:06 PM, astro77<astro_coder(at)yahoo(dot)com> wrote:
>> I was receiving an error that an XML field does not support the various
>> indexes available in postgresql.
>
> Please post what happens when you try.
>
>> Is there an example of how to do this
>> properly?
>
> Not sure.
>
> ...Robert
>
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