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https://issues.apache.org/jira/browse/LUCENE-7500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16044579#comment-16044579
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Michael McCandless commented on LUCENE-7500:
--------------------------------------------
+1, this is a nice simplification!
Maybe we can move most of the static methods from MultiFields to ReaderUtil or
maybe a new MultiReaderUtil, and then can we remove MultiFields entirely? Who
still uses it (instantiates it as a Fields instance)? (But we can do that
separately).
Can you add a comment here (PhraseHelper.java) explaining why the incoming
field is ignored?
{noformat}
+ public Terms terms(String field) throws IOException {
+ return super.terms(fieldName);
+ }
{noformat}
This change in ParallelReader seems a little dangerous:
{noformat}
@@ -130,9 +131,12 @@
if (!fieldToReader.containsKey(fieldInfo.name)) {
builder.add(fieldInfo);
fieldToReader.put(fieldInfo.name, reader);
- if (fieldInfo.hasVectors()) {
- tvFieldToReader.put(fieldInfo.name, reader);
- }
+ }
+ if (fieldInfo.getIndexOptions() != IndexOptions.NONE) {
+ indexFieldToReader.putIfAbsent(fieldInfo.name, reader);
+ }
+ if (fieldInfo.hasVectors()) {
+ tvFieldToReader.putIfAbsent(fieldInfo.name, reader);
}
}
}
{noformat}
because the two {{putIfAbsent}} are not inside the {{if
(!fieldToReader.containsKey(fieldInfo.name))}}. This could lead to cases where
the FieldInfos returned by ParallelReader disagrees with what the
{{terms(String)}} and term vectors APIs provide?
> Remove LeafReader.fields()
> --------------------------
>
> Key: LUCENE-7500
> URL: https://issues.apache.org/jira/browse/LUCENE-7500
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: David Smiley
> Assignee: David Smiley
> Fix For: master (7.0)
>
> Attachments: LUCENE_7500_avoid_leafReader_fields.patch,
> LUCENE_7500_avoid_leafReader_fields.patch,
> LUCENE_7500_Remove_LeafReader_fields.patch,
> LUCENE_7500_Remove_LeafReader_fields.patch
>
>
> {{Fields}} seems like a pointless intermediary between the {{LeafReader}} and
> {{Terms}}. Why not have {{LeafReader.getTerms(fieldName)}} instead? One loses
> the ability to get the count and iterate over indexed fields, but it's not
> clear what real use-cases are for that and such rare needs could figure that
> out with FieldInfos.
> [~mikemccand] pointed out that we'd probably need to re-introduce a
> {{TermVectors}} class since TV's are row-oriented not column-oriented. IMO
> they should be column-oriented but that'd be a separate issue.
> _(p.s. I'm lacking time to do this w/i the next couple months so if someone
> else wants to tackle it then great)_
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