Merge pull request #21958 from vespa-engine/toregge/factor-out-single-small-numeric-search-context-from-single-small-numeric-attributev7.569.71

Factor out SingleSmallNumericSearchContext from SingleSmallNumericAttribute.

1 files changed, 58 insertions, 0 deletions

diff --git a/searchlib/src/vespa/searchlib/attribute/single_small_numeric_search_context.h b/searchlib/src/vespa/searchlib/attribute/single_small_numeric_search_context.h
new file mode 100644
index 00000000000..46ed02b3eca
--- /dev/null
+++ b/searchlib/src/vespa/searchlib/attribute/single_small_numeric_search_context.h
@@ -0,0 +1,58 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+#pragma once
+
+#include "numeric_search_context.h"
+#include "numeric_range_matcher.h"
+#include <vespa/vespalib/util/atomic.h>
+
+namespace search::attribute {
+
+/*
+ * SingleSmallNumericSearchContext handles the creation of search iterators for
+ * a query term on a single value small numeric attribute vector.
+ */
+class SingleSmallNumericSearchContext : public NumericSearchContext<NumericRangeMatcher<int8_t>>
+{
+private:
+    using Word = uint32_t;
+    using T = int8_t;
+    const Word *_wordData;
+    Word _valueMask;
+    uint32_t _valueShiftShift;
+    uint32_t _valueShiftMask;
+    uint32_t _wordShift;
+
+    int32_t onFind(DocId docId, int32_t elementId, int32_t & weight) const override {
+        return find(docId, elementId, weight);
+    }
+
+    int32_t onFind(DocId docId, int32_t elementId) const override {
+        return find(docId, elementId);
+    }
+
+public:
+    SingleSmallNumericSearchContext(std::unique_ptr<QueryTermSimple> qTerm, const AttributeVector& toBeSearched, const Word* word_data, Word value_mask, uint32_t value_shift_shift, uint32_t value_shift_mask, uint32_t word_shift);
+
+    int32_t find(DocId docId, int32_t elemId, int32_t & weight) const {
+        if ( elemId != 0) return -1;
+        const Word &word = _wordData[docId >> _wordShift];
+        uint32_t valueShift = (docId & _valueShiftMask) << _valueShiftShift;
+        T v = (vespalib::atomic::load_ref_relaxed(word) >> valueShift) & _valueMask;
+        weight = 1;
+        return match(v) ? 0 : -1;
+    }
+
+    int32_t find(DocId docId, int32_t elemId) const {
+        if ( elemId != 0) return -1;
+        const Word &word = _wordData[docId >> _wordShift];
+        uint32_t valueShift = (docId & _valueShiftMask) << _valueShiftShift;
+        T v = (vespalib::atomic::load_ref_relaxed(word) >> valueShift) & _valueMask;
+        return match(v) ? 0 : -1;
+    }
+
+    std::unique_ptr<queryeval::SearchIterator>
+    createFilterIterator(fef::TermFieldMatchData* matchData, bool strict) override;
+};
+
+}