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counts unique terms if not available in Lucene #2053

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counts unique terms if not available in Lucene #2053

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16 changes: 15 additions & 1 deletion src/main/java/io/anserini/index/IndexReaderUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -773,6 +773,20 @@ public static String convertLuceneDocidToDocid(IndexReader reader, int docid) {
}
}

// Internal helper: counts the number of unique terms
private static long getUniqueTerms(IndexReader reader) throws IOException {
Terms terms = MultiTerms.getTerms(reader, Constants.CONTENTS);
long UniqueTerms = terms.size();
if (UniqueTerms == -1) { // terms.size() may not be available in Lucene
UniqueTerms = 0;
TermsEnum it = terms.iterator();
while (it.next() != null) {
UniqueTerms += 1;
}
}
return UniqueTerms;
}

/**
* Returns index statistics.
*
Expand All @@ -786,7 +800,7 @@ public static Map<String, Object> getIndexStats(IndexReader reader) {

indexStats.put("documents", reader.numDocs());
indexStats.put("non_empty_documents", reader.getDocCount(Constants.CONTENTS));
indexStats.put("unique_terms", terms.size());
indexStats.put("unique_terms", getUniqueTerms(reader));
indexStats.put("total_terms", reader.getSumTotalTermFreq(Constants.CONTENTS));
} catch (IOException e) {
// Eat any exceptions and just return null.
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