1 files changed, 26 insertions, 0 deletions
diff --git a/eval/src/tests/ann/nns.h b/eval/src/tests/ann/nns.h
index ffe2882188e..ef3e4b5d69c 100644
--- a/eval/src/tests/ann/nns.h
+++ b/eval/src/tests/ann/nns.h
@@ -37,6 +37,31 @@ struct NnsHitComparatorLessDocid {
     }
 };
 
+class BitVector {
+private:
+    std::vector<uint64_t> _bits;
+public:
+    BitVector(size_t sz) : _bits((sz+63)/64) {}
+    BitVector& setBit(size_t idx) {
+        uint64_t mask = 1;
+        mask <<= (idx%64);
+        _bits[idx/64] |= mask;
+        return *this;
+    }
+    bool isSet(size_t idx) const {
+        uint64_t mask = 1;
+        mask <<= (idx%64);
+        uint64_t word = _bits[idx/64];
+        return (word & mask) != 0;
+    }
+    BitVector& clearBit(size_t idx) {
+        uint64_t mask = 1;
+        mask <<= (idx%64);
+        _bits[idx/64] &= ~mask;
+        return *this;
+    }
+};
+
 template <typename FltType = float>
 class NNS
 {
@@ -50,6 +75,7 @@ public:
 
     using Vector = vespalib::ConstArrayRef<FltType>;
     virtual std::vector<NnsHit> topK(uint32_t k, Vector vector, uint32_t search_k) = 0;
+    virtual std::vector<NnsHit> topKfilter(uint32_t k, Vector vector, uint32_t search_k, const BitVector &blacklist) = 0;
     virtual ~NNS() {}
 protected:
     uint32_t _numDims;