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https://issues.apache.org/jira/browse/SOLR-7379?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated SOLR-7379:
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Attachment: SOLR-7379__RptWithGeometrySpatialField.patch
Here's a patch. Notes:
* I chose the name RptWithGeometrySpatialField; feedback welcome. It inherits
the same schema attribute options as the RPT field but strictly speaking
doesn't subclass that field type.
** I overrode the default distErrPct at indexing time to be 0.15.
* Compatibility with heatmaps.
* Uses a SolrCache if you define one in solrconfig.xml.
* Includes some getters on Lucene spatial's CompositeSpatialStrategy.
I was tempted, and attempted to subclass the Rpt field type which would have
made the initialization less error prone & simple, and would have made heatmap
compatibility work without issue. But it started becoming an ugly hack. The
approach in this patch is perhaps a hack in that it contains another fieldType
and deals with some initialization quirks in init(); but there isn't much to
it. Another option is to do like BBoxField's component numeric fields...
though I don't love that it requires more definitions for the user to make in
the schema. But maybe that's a better trade-off, all things considered (it
wouldn't have required the modification to heatmap here).
The cache is very interesting. Typically, a SolrCache gets blown away on every
commit. But using a NoOpRegenerator, it will effectively get re-instated. But
that can only be used for caching certain types of things and may require the
code using the cache to facilitate this working -- so don't expect it to work
on the FilterCache, for example. The trick I do here is a special key to the
cache that is comprised of a weak reference to a LeafReader segment core key,
plus the segment-local docId. Unfortunately these cache entries won't eagerly
clean themselves up if the segment becomes unreachable; however, it shouldn't
stick around long if an LRU cache is used, since those entries won't be used
again. The cache should be configured similar to the following, assuming a
hypothetical field named "geom":
{code:xml}
<cache name="perSegSpatialFieldCache_geom"
class="solr.LRUCache"
size="256"
initialSize="0"
autowarmCount="100%"
regenerator="solr.NoOpRegenerator"/>
{code}
The 2nd and subsequent successful cache lookups will be the fastest for
polygons in particular, since on the 1st cache hit, JtsGeometry.index() is
called on it (if it is of that type).
> CompositeSpatialStrategy FieldType
> ----------------------------------
>
> Key: SOLR-7379
> URL: https://issues.apache.org/jira/browse/SOLR-7379
> Project: Solr
> Issue Type: New Feature
> Components: spatial
> Reporter: David Smiley
> Assignee: David Smiley
> Fix For: 5.2
>
> Attachments: SOLR-7379__RptWithGeometrySpatialField.patch
>
>
> We should add a Solr spatial FieldType that uses the new
> CompositeSpatialStrategy. Essentially this enabled geometry backed shapes for
> accuracy combined with the grid indexes of RPT for speed.
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