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https://issues.apache.org/jira/browse/LUCENE-1789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12740362#action_12740362
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Mark Miller commented on LUCENE-1789:
-------------------------------------
Its basically what I did as a first attempt at 1771 actually (you have a
glimpse into how hectic my brain is in that I didn't remember that 30 minutes
ago) :
(with some of this in ReaderUtil now, it can be written in half the length)
{code}
+ // constructor
+ private ValueSourceScorer(Similarity similarity, IndexReader reader,
ValueSourceWeight w, boolean valuesFromSubReaders) throws IOException {
super(similarity);
+ if(!valuesFromSubReaders) {
+ this.weight = w;
+ this.qWeight = w.getValue();
+ // this is when/where the values are first created.
+ vals = valSrc.getValues(reader);
+ termDocs = reader.termDocs(null);
+ return;
+ }
+
this.weight = w;
this.qWeight = w.getValue();
- // this is when/where the values are first created.
- vals = valSrc.getValues(reader);
+ List subReadersList = new ArrayList();
+ ReaderUtil.gatherSubReaders(subReadersList, reader);
+ subReaders = (IndexReader[]) subReadersList.toArray(new
IndexReader[subReadersList.size()]);
+ valsArray = new DocValues[subReaders.length];
+ docStarts = new int[subReaders.length];
+ int maxDoc = 0;
+ for (int i = 0; i < subReaders.length; i++) {
+ docStarts[i] = maxDoc;
+ maxDoc += subReaders[i].maxDoc();
+ valsArray[i] = valSrc.getValues(subReaders[i]);
+ }
+
+ vals = new DocValues() {
+
+ //@Override
+ public float floatVal(int doc) {
+ int n = ReaderUtil.subSearcher(doc, subReaders.length, docStarts);
+ return valsArray[n].floatVal(doc);
+ }
+
+ //@Override
+ public String toString(int doc) {
+ return Float.toString(floatVal(doc));
+ }
+
+ };
termDocs = reader.termDocs(null);
}
{code}
> getDocValues should provide a MultiReader DocValues abstraction
> ---------------------------------------------------------------
>
> Key: LUCENE-1789
> URL: https://issues.apache.org/jira/browse/LUCENE-1789
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Hoss Man
> Priority: Minor
> Fix For: 2.9
>
>
> When scoring a ValueSourceQuery, the scoring code calls
> ValueSource.getValues(reader) on *each* leaf level subreader -- so DocValue
> instances are backed by the individual FieldCache entries of the subreaders
> -- but if Client code were to inadvertently called getValues() on a
> MultiReader (or DirectoryReader) they would wind up using the "outer"
> FieldCache.
> Since getValues(IndexReader) returns DocValues, we have an advantage here
> that we don't have with FieldCache API (which is required to provide direct
> array access). getValues(IndexReader) could be implimented so that *IF* some
> a caller inadvertently passes in a reader with non-null subReaders, getValues
> could generate a DocValues instance for each of the subReaders, and then wrap
> them in a composite "MultiDocValues".
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