Hello,
Yes, using a placeholder value should work for now. We could
potentially support null values in the attribute index - if you're
interested in contributing to that let us know. Up until now, people
have only been interested in 'not null' queries.
From a brief search, it appears that we don't even have any unit
tests for 'is null' queries, so it is definitely possible that they
aren't working correctly.
Thanks,
Emilio
On 1/4/19 12:16 PM, BKRuns26.2 wrote:
Emilio,
After adding the explain logging, it does appear that is is
attempting to do a full table scan, but it is still not
returning any results. Unfortunately I cannot send out the
results as it is running on a closed system. I am going to
work on setting up a similar environment on our test system
and will get you the results.
I assume the best approach (at least for Strings) would be
to avoid NULL and use empty strings for values with no data or
possibly the String NULL?
Thanks,
Brad
Hello,
Our attribute indices don't store null values, so if you
query for "is null" it's going to end up doing a full table
scan, which can take a while. That said, it should return
eventually. If you have enabled query timeouts or blocked
full table scans, that may be preventing a result.
Can you enable explain logging, and reply back with the
results?
https://www.geomesa.org/documentation/user/geoserver.html#logging-explain-query-planning
Thanks,
Emilio
On
1/3/19 3:06 PM, BKRuns26.2 wrote:
We are running into an issue of not being
able to filter null values on Indexed attributes.
We added a set of data that has several indexed
attributes (full indexes) for improved query
performance that sometimes contain null values.
Filtering on the attributes via GeoServer works fine
unless we are trying to filter for all values that
are null. The standard GeoServer syntax of "is null"
never returns an empty feature collection yet we
know null values exist. No errors appear in the
GeoServer log. If we filter "is not null" it returns
only values that aren't null so that seems to work.
Just the is null does not work.
Thanks,
Brad
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