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https://issues.apache.org/jira/browse/LUCENE-1541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675212#action_12675212
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Ning Li commented on LUCENE-1541:
---------------------------------
If you are *really* concerned with the additional loop and the additional array
allocations, a long can be used to represent the precision steps. For example,
precision steps 2-2-2-2-8-8-8-8-8-16 are represented as 0x80008080808080aa.
Then bitCount, shift and numberOfTrailingZeros can be used to determine the
length of the trie array and the individual precision steps. Hmm, we still have
to support Java 1.4?
> Trie range - make trie range indexing more flexible
> ---------------------------------------------------
>
> Key: LUCENE-1541
> URL: https://issues.apache.org/jira/browse/LUCENE-1541
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/*
> Affects Versions: 2.9
> Reporter: Ning Li
> Assignee: Uwe Schindler
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1541.patch
>
>
> In the current trie range implementation, a single precision step is
> specified. With a large precision step (say 8), a value is indexed in fewer
> terms (8) but the number of terms for a range can be large. With a small
> precision step (say 2), the number of terms for a range is smaller but a
> value is indexed in more terms (32).
> We want to add an option that different precision steps can be set for
> different precisions. An expert can use this option to keep the number of
> terms for a range small and at the same time index a value in a small number
> of terms. See the discussion in LUCENE-1470 that results in this issue.
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