Hi,
I'm having a problem using "order by" in a ITQL query when the field
used for sorting is empty.
Imagine this query:
**********************************************************************
select
$pid $dateinitial
from <#ri>
where
$pid <http://roda.dgarq.gov.pt/#description-dateinitial> $dateinitial
order by $pid
limit 3 offset 0
--- Results ---
"pid","dateinitial"
info:fedora/roda:168,
info:fedora/roda:1930,
info:fedora/roda:1931,
**********************************************************************
Note that the second field $dateinitial is empty for all values.
Now, if i do the same query but ordering by $dateinitial. Like this:
**********************************************************************
select
$pid $dateinitial
from <#ri>
where
$pid <http://roda.dgarq.gov.pt/#description-dateinitial> $dateinitial
order by $dateinital
limit 3 offset 0
--- Result is error ---
org.trippi.TrippiException: ITQL query failed: empty String
at org.trippi.impl.kowari.KowariSession.query(KowariSession.java:256)
at
org.trippi.impl.base.ConcurrentTriplestoreReader.findTuples(ConcurrentTriplestoreReader.java:79)
...
**********************************************************************
Does anybody knows a solution arround this? I want to be able to sort
by any field, even when it is empty.
Best regards,
Rui Castro
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