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https://issues.apache.org/jira/browse/LUCENE-6930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15112774#comment-15112774
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Michael McCandless commented on LUCENE-6930:
--------------------------------------------
OK, phew!
> Decouple GeoPointField from NumericType
> ---------------------------------------
>
> Key: LUCENE-6930
> URL: https://issues.apache.org/jira/browse/LUCENE-6930
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Nicholas Knize
> Attachments: LUCENE-6930.patch, LUCENE-6930.patch, LUCENE-6930.patch
>
>
> {{GeoPointField}} currently relies on {{NumericTokenStream}} to create prefix
> terms for a GeoPoint using the precision step defined in {{GeoPointField}}.
> At search time {{GeoPointTermsEnum}} recurses to a max precision that is
> computed by the Query parameters. This max precision is never the full
> precision, so creating and indexing the full precision terms is useless and
> wasteful (it was always a side effect of just using indexing logic from the
> Numeric type).
> Furthermore, since the numerical logic always stored high precision terms
> first, the recursion in {{GeoPointTermsEnum}} required transient memory for
> storing ranges. By moving the trie logic to its own {{GeoPointTokenStream}}
> and reversing the term order (such that lower resolution terms are first),
> the GeoPointTermsEnum can naturally traverse, enabling on-demand creation of
> PrefixTerms. This will be done in a separate issue.
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