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https://issues.apache.org/jira/browse/LUCENE-1614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714567#action_12714567
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Shai Erera commented on LUCENE-1614:
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bq. Under what cases are NPE & AIOOBE thrown by ReqExclScorer?
Previously, ReqExclScorer had this code:
{code}
public int doc() {
return reqScorer.doc(); // reqScorer may be null when next() or skipTo()
already return false
}
{code}
The current patch already fixes it to not rely on reqScorer to be or not be
null (we've also discussed this issue somewhere up this thread).
bq. I don't think we need to document that you shouldn't throw RuntimeExceptions
Yeah ... I guess you're right. When I read the documentation it does sound kind
of silly (as if we're begging "please don't throw RuntimeException"). I'll
remove that. I just wanted to encourage implementers to not rely on an object
which may or may not be null (or index going out of range).
bq. Well the javadoc clearly states the requirement ("next must be called")
You're right Mike, I didn't read the javadocs (shame on me :) ). I'll fix the
code then.
> Add next() and skipTo() variants to DocIdSetIterator that return the current
> doc, instead of boolean
> ----------------------------------------------------------------------------------------------------
>
> Key: LUCENE-1614
> URL: https://issues.apache.org/jira/browse/LUCENE-1614
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: Shai Erera
> Fix For: 2.9
>
> Attachments: LUCENE-1614.patch, LUCENE-1614.patch, LUCENE-1614.patch,
> LUCENE-1614.patch, LUCENE-1614.patch, LUCENE-1614.patch, LUCENE-1614.patch
>
>
> See
> http://www.nabble.com/Another-possible-optimization---now-in-DocIdSetIterator-p23223319.html
> for the full discussion. The basic idea is to add variants to those two
> methods that return the current doc they are at, to save successive calls to
> doc(). If there are no more docs, return -1. A summary of what was discussed
> so far:
> # Deprecate those two methods.
> # Add nextDoc() and skipToDoc(int) that return doc, with default impl in DISI
> (calls next() and skipTo() respectively, and will be changed to abstract in
> 3.0).
> #* I actually would like to propose an alternative to the names: advance()
> and advance(int) - the first advances by one, the second advances to target.
> # Wherever these are used, do something like '(doc = advance()) >= 0' instead
> of comparing to -1 for improved performance.
> I will post a patch shortly
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