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https://issues.apache.org/jira/browse/LUCENE-4315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13438479#comment-13438479
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Uwe Schindler commented on LUCENE-4315:
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Hi Mike, I already proposed that and opened this issue to discuss this. As a
first step to "correct" the current status is the attached patch. But I also
agree to make it mandatory.
The following Fields implementation would then need to manually iterate and
(maybe store the value in a volatile as cache):
- MultiFields (returns -1)
- FieldFilterAtomicReader (returns -1 now, but previously also iterated -
removed that code because it was broken)
> Minor fixes for Fields abstract class, TermVectorsWriter
> --------------------------------------------------------
>
> Key: LUCENE-4315
> URL: https://issues.apache.org/jira/browse/LUCENE-4315
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.0-BETA
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 5.0, 4.0
>
> Attachments: LUCENE-4315.patch, LUCENE-4315.patch
>
>
> The Fields abstract class is a little bit inconsistent. It does not allow
> iterator() to throw IOException, but size() is allowed to do this. This is
> inconsistent, as looping through iterator always returns size without
> IOException.
> Also Fields.size() allows -1 as return value, but almost all implementation
> (only MultiFields and FieldFilteredAtomicReader may return -1) actually
> implement it in a very cheap way. This is simple statistics, we should
> rethink this:
> - TermVectorsWriter's basic merging (without optimization requires this
> information, also Terms.size())
> - We can default Fields.size() to count iterator, if not explicitely
> implemented. This method is called only by "IndexReader introspection) and
> TermVectors merging.
> We should maybe enforce size() for Fields to return a value >=0 (Preflex also
> knows its size!), and if the impl class does not have it (MultiFields,
> FieldFilteredAtomicReader, loop by supplying default impl).
> The current patch still allows -1 as return value and removes IOException
> from the signature.
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