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From "Patrick Morton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5692) Deprecate spatial DisjointSpatialFilter
Date Mon, 28 Jul 2014 11:00:46 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14076083#comment-14076083
] 

Patrick Morton commented on LUCENE-5692:
----------------------------------------

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> Deprecate spatial DisjointSpatialFilter
> ---------------------------------------
>
>                 Key: LUCENE-5692
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5692
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/spatial
>    Affects Versions: 5.0
>            Reporter: David Smiley
>            Assignee: David Smiley
>             Fix For: 5.0, 4.10
>
>         Attachments: LUCENE-5692_Deprecate_DisjointSpatialFilter__RPT_stops_using_it.patch
>
>
> The spatial predicate "IsDisjointTo" is almost the same as the inverse of "Intersects",
except that it shouldn't match documents without spatial data.  In another sense it's as if
the query shape were inverted.
> DisjointSpatialFilter is a utility filter that works (or worked, rather) by using the
FieldCache to see which documents have spatial data (getDocsWithField()). Calculating that
was probably very slow but it was at least cacheable. Since LUCENE-5666 (v5/trunk only), Rob
replaced this to use DocValues.  However for some SpatialStrategies (PrefixTree based) it
wouldn't make any sense to use DocValues *just* so that at search time you could call getDocsWithField()
when there's no other need for the un-inversion (e.g. no need to lookup terms by document).
> Perhaps an immediate fix is simply to revert the change made to DisjointSpatialFilter
so that it uses the FieldCache again, if that works (though it's not public?).  But stepping
back a bit, this DisjointSpatialFilter is really something unfortunate that doesn't work as
well as it could because it's not at the level of Solr or ES -- that is, there's no access
to a filter-cache.  So I propose I simply remove it, and if a user wants to do this for real,
they should index a boolean field marking wether there's spatial data and then combine that
with a NOT and Intersects, in a straight-forward way.  
> Alternatively, some sort of inverting query shape could be developed, although it wouldn't
work with the SpatialPrefixTree technique because there is no edge distinction -- the edge
matches normally and notwithstanding changes to RPT algorithms it would also match the edge
of an inverted shape.



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