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@yahoo.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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