Examples with LongPriorityQueue org.apache.solr.util.LongPriorityQueue used on opensource projects

Example 1 with LongPriorityQueue

use of org.apache.solr.util.LongPriorityQueue in project lucene-solr by apache.

the class DocValuesFacets method getCounts.

public static NamedList<Integer> getCounts(SolrIndexSearcher searcher, DocSet docs, String fieldName, int offset, int limit, int mincount, boolean missing, String sort, String prefix, Predicate<BytesRef> termFilter, FacetDebugInfo fdebug) throws IOException {
    SchemaField schemaField = searcher.getSchema().getField(fieldName);
    FieldType ft = schemaField.getType();
    NamedList<Integer> res = new NamedList<>();
    // TODO: remove multiValuedFieldCache(), check dv type / uninversion type?
    final boolean multiValued = schemaField.multiValued() || ft.multiValuedFieldCache();
    // for term lookups only
    final SortedSetDocValues si;
    // for mapping per-segment ords to global ones
    OrdinalMap ordinalMap = null;
    if (multiValued) {
        si = searcher.getSlowAtomicReader().getSortedSetDocValues(fieldName);
        if (si instanceof MultiDocValues.MultiSortedSetDocValues) {
            ordinalMap = ((MultiSortedSetDocValues) si).mapping;
        }
    } else {
        SortedDocValues single = searcher.getSlowAtomicReader().getSortedDocValues(fieldName);
        si = single == null ? null : DocValues.singleton(single);
        if (single instanceof MultiDocValues.MultiSortedDocValues) {
            ordinalMap = ((MultiDocValues.MultiSortedDocValues) single).mapping;
        }
    }
    if (si == null) {
        return finalize(res, searcher, schemaField, docs, -1, missing);
    }
    if (si.getValueCount() >= Integer.MAX_VALUE) {
        throw new UnsupportedOperationException("Currently this faceting method is limited to " + Integer.MAX_VALUE + " unique terms");
    }
    final BytesRefBuilder prefixRef;
    if (prefix == null) {
        prefixRef = null;
    } else if (prefix.length() == 0) {
        prefix = null;
        prefixRef = null;
    } else {
        prefixRef = new BytesRefBuilder();
        prefixRef.copyChars(prefix);
    }
    int startTermIndex, endTermIndex;
    if (prefix != null) {
        startTermIndex = (int) si.lookupTerm(prefixRef.get());
        if (startTermIndex < 0)
            startTermIndex = -startTermIndex - 1;
        prefixRef.append(UnicodeUtil.BIG_TERM);
        endTermIndex = (int) si.lookupTerm(prefixRef.get());
        assert endTermIndex < 0;
        endTermIndex = -endTermIndex - 1;
    } else {
        startTermIndex = -1;
        endTermIndex = (int) si.getValueCount();
    }
    final int nTerms = endTermIndex - startTermIndex;
    int missingCount = -1;
    final CharsRefBuilder charsRef = new CharsRefBuilder();
    if (nTerms > 0 && docs.size() >= mincount) {
        // count collection array only needs to be as big as the number of terms we are
        // going to collect counts for.
        final int[] counts = new int[nTerms];
        if (fdebug != null) {
            fdebug.putInfoItem("numBuckets", nTerms);
        }
        Filter filter = docs.getTopFilter();
        List<LeafReaderContext> leaves = searcher.getTopReaderContext().leaves();
        for (int subIndex = 0; subIndex < leaves.size(); subIndex++) {
            LeafReaderContext leaf = leaves.get(subIndex);
            // solr docsets already exclude any deleted docs
            DocIdSet dis = filter.getDocIdSet(leaf, null);
            DocIdSetIterator disi = null;
            if (dis != null) {
                disi = dis.iterator();
            }
            if (disi != null) {
                if (multiValued) {
                    SortedSetDocValues sub = leaf.reader().getSortedSetDocValues(fieldName);
                    if (sub == null) {
                        sub = DocValues.emptySortedSet();
                    }
                    final SortedDocValues singleton = DocValues.unwrapSingleton(sub);
                    if (singleton != null) {
                        // some codecs may optimize SORTED_SET storage for single-valued fields
                        accumSingle(counts, startTermIndex, singleton, disi, subIndex, ordinalMap);
                    } else {
                        accumMulti(counts, startTermIndex, sub, disi, subIndex, ordinalMap);
                    }
                } else {
                    SortedDocValues sub = leaf.reader().getSortedDocValues(fieldName);
                    if (sub == null) {
                        sub = DocValues.emptySorted();
                    }
                    accumSingle(counts, startTermIndex, sub, disi, subIndex, ordinalMap);
                }
            }
        }
        if (startTermIndex == -1) {
            missingCount = counts[0];
        }
        // IDEA: we could also maintain a count of "other"... everything that fell outside
        // of the top 'N'
        int off = offset;
        int lim = limit >= 0 ? limit : Integer.MAX_VALUE;
        if (sort.equals(FacetParams.FACET_SORT_COUNT) || sort.equals(FacetParams.FACET_SORT_COUNT_LEGACY)) {
            int maxsize = limit > 0 ? offset + limit : Integer.MAX_VALUE - 1;
            maxsize = Math.min(maxsize, nTerms);
            LongPriorityQueue queue = new LongPriorityQueue(Math.min(maxsize, 1000), maxsize, Long.MIN_VALUE);
            // the smallest value in the top 'N' values
            int min = mincount - 1;
            for (int i = (startTermIndex == -1) ? 1 : 0; i < nTerms; i++) {
                int c = counts[i];
                if (c > min) {
                    if (termFilter != null) {
                        final BytesRef term = si.lookupOrd(startTermIndex + i);
                        if (!termFilter.test(term)) {
                            continue;
                        }
                    }
                    // smaller term numbers sort higher, so subtract the term number instead
                    long pair = (((long) c) << 32) + (Integer.MAX_VALUE - i);
                    boolean displaced = queue.insert(pair);
                    if (displaced)
                        min = (int) (queue.top() >>> 32);
                }
            }
            // if we are deep paging, we don't have to order the highest "offset" counts.
            int collectCount = Math.max(0, queue.size() - off);
            assert collectCount <= lim;
            // the start and end indexes of our list "sorted" (starting with the highest value)
            int sortedIdxStart = queue.size() - (collectCount - 1);
            int sortedIdxEnd = queue.size() + 1;
            final long[] sorted = queue.sort(collectCount);
            for (int i = sortedIdxStart; i < sortedIdxEnd; i++) {
                long pair = sorted[i];
                int c = (int) (pair >>> 32);
                int tnum = Integer.MAX_VALUE - (int) pair;
                final BytesRef term = si.lookupOrd(startTermIndex + tnum);
                ft.indexedToReadable(term, charsRef);
                res.add(charsRef.toString(), c);
            }
        } else {
            // add results in index order
            int i = (startTermIndex == -1) ? 1 : 0;
            if (mincount <= 0 && termFilter == null) {
                // if mincount<=0 and we're not examining the values for the term filter, then
                // we won't discard any terms and we know exactly where to start.
                i += off;
                off = 0;
            }
            for (; i < nTerms; i++) {
                int c = counts[i];
                if (c < mincount)
                    continue;
                BytesRef term = null;
                if (termFilter != null) {
                    term = si.lookupOrd(startTermIndex + i);
                    if (!termFilter.test(term)) {
                        continue;
                    }
                }
                if (--off >= 0)
                    continue;
                if (--lim < 0)
                    break;
                if (term == null) {
                    term = si.lookupOrd(startTermIndex + i);
                }
                ft.indexedToReadable(term, charsRef);
                res.add(charsRef.toString(), c);
            }
        }
    }
    return finalize(res, searcher, schemaField, docs, missingCount, missing);
}