From f49ff6ae01de4f04bb547eb85cc49c1c8828b145 Mon Sep 17 00:00:00 2001
From: Tor Egge <Tor.Egge@online.no>
Date: Tue, 4 Jul 2023 15:36:32 +0200
Subject: Handle sorting on multivalue attributes.

---
 .../src/vespa/searchlib/attribute/attrvector.h     |  5 ++
 .../src/vespa/searchlib/attribute/attrvector.hpp   | 65 ++++++++++++++++++++++
 .../src/vespa/searchlib/attribute/floatbase.h      |  5 +-
 .../src/vespa/searchlib/attribute/integerbase.h    |  6 +-
 .../searchlib/attribute/multinumericattribute.h    |  2 +
 .../searchlib/attribute/multinumericattribute.hpp  | 25 +++++++++
 .../attribute/multinumericenumattribute.h          |  3 +-
 .../attribute/multinumericenumattribute.hpp        | 25 +++++++++
 .../searchlib/attribute/multistringattribute.h     |  3 +
 .../searchlib/attribute/multistringattribute.hpp   | 29 ++++++++++
 .../src/vespa/searchlib/attribute/stringbase.h     |  5 +-
 .../src/vespa/searchlib/common/sortresults.cpp     | 12 ++--
 12 files changed, 167 insertions(+), 18 deletions(-)

(limited to 'searchlib/src')

diff --git a/searchlib/src/vespa/searchlib/attribute/attrvector.h b/searchlib/src/vespa/searchlib/attribute/attrvector.h
index 3c96c8e3158..4ee16a044f7 100644
--- a/searchlib/src/vespa/searchlib/attribute/attrvector.h
+++ b/searchlib/src/vespa/searchlib/attribute/attrvector.h
@@ -125,6 +125,8 @@ private:
     uint32_t get(DocId doc, WeightedEnum * v, uint32_t sz)  const override { return getAllEnumHelper(doc, v, sz); }
     uint32_t get(DocId doc, WeightedInt * v, uint32_t sz)   const override { return getAllHelper<WeightedInt, largeint_t>(doc, v, sz); }
     uint32_t get(DocId doc, WeightedFloat * v, uint32_t sz) const override { return getAllHelper<WeightedFloat, double>(doc, v, sz); }
+    long onSerializeForAscendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const override;
+    long onSerializeForDescendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const override;
 };
 
 //-----------------------------------------------------------------------------
@@ -220,5 +222,8 @@ private:
         }
         return available;
     }
+    long on_serialize_for_sort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc, bool asc) const;
+    long onSerializeForAscendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const override;
+    long onSerializeForDescendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const override;
 };
 
diff --git a/searchlib/src/vespa/searchlib/attribute/attrvector.hpp b/searchlib/src/vespa/searchlib/attribute/attrvector.hpp
index d4e524d904f..9354473499e 100644
--- a/searchlib/src/vespa/searchlib/attribute/attrvector.hpp
+++ b/searchlib/src/vespa/searchlib/attribute/attrvector.hpp
@@ -3,6 +3,8 @@
 
 #include "attrvector.h"
 #include "load_utils.h"
+#include "numeric_sort_blob_writer.h"
+#include "string_sort_blob_writer.h"
 #include <vespa/vespalib/util/hdr_abort.h>
 #include <vespa/searchlib/util/filekit.h>
 
@@ -89,6 +91,36 @@ NumericDirectAttrVector(const vespalib::string & baseFileName)
     }
 }
 
+template <typename F, typename B>
+long
+NumericDirectAttrVector<F, B>::onSerializeForAscendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const
+{
+    if (!F::IsMultiValue()) {
+        return search::NumericDirectAttribute<B>::onSerializeForAscendingSort(doc, serTo, available, bc);
+    }
+    search::attribute::NumericSortBlobWriter<BaseType, true> writer;
+    vespalib::ConstArrayRef<BaseType> values(this->_data.data() + this->_idx[doc], this->_idx[doc + 1] - this->_idx[doc]);
+    for (auto& v : values) {
+        writer.candidate(v);
+    }
+    return writer.write(serTo, available);
+}
+
+template <typename F, typename B>
+long
+NumericDirectAttrVector<F, B>::onSerializeForDescendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const
+{
+    if (!F::IsMultiValue()) {
+        return search::NumericDirectAttribute<B>::onSerializeForDescendingSort(doc, serTo, available, bc);
+    }
+    search::attribute::NumericSortBlobWriter<BaseType, false> writer;
+    vespalib::ConstArrayRef<BaseType> values(this->_data.data() + this->_idx[doc], this->_idx[doc + 1] - this->_idx[doc]);
+    for (auto& v : values) {
+        writer.candidate(v);
+    }
+    return writer.write(serTo, available);
+}
+
 template <typename F>
 StringDirectAttrVector<F>::
 StringDirectAttrVector(const vespalib::string & baseFileName, const Config & c) :
@@ -111,3 +143,36 @@ StringDirectAttrVector(const vespalib::string & baseFileName) :
     setEnum();
 }
 
+template <typename F>
+long
+StringDirectAttrVector<F>::on_serialize_for_sort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc, bool asc) const
+{
+    search::attribute::StringSortBlobWriter writer(serTo, available, bc, asc);
+    vespalib::ConstArrayRef<uint32_t> offsets(this->_offsets.data() + this->_idx[doc], this->_idx[doc + 1] - this->_idx[doc]);
+    for (auto& offset : offsets) {
+        if (!writer.candidate(&this->_buffer[offset])) {
+            return -1;
+        }
+    }
+    return writer.write();
+}
+
+template <typename F>
+long
+StringDirectAttrVector<F>::onSerializeForAscendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const
+{
+    if (!F::IsMultiValue()) {
+        return search::StringDirectAttribute::onSerializeForAscendingSort(doc, serTo, available, bc);
+    }
+    return on_serialize_for_sort(doc, serTo, available, bc, true);
+}
+
+template <typename F>
+long
+StringDirectAttrVector<F>::onSerializeForDescendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const
+{
+    if (!F::IsMultiValue()) {
+        return search::StringDirectAttribute::onSerializeForDescendingSort(doc, serTo, available, bc);
+    }
+    return on_serialize_for_sort(doc, serTo, available, bc, false);
+}
diff --git a/searchlib/src/vespa/searchlib/attribute/floatbase.h b/searchlib/src/vespa/searchlib/attribute/floatbase.h
index b1b27eb7dd5..4ee426c0a95 100644
--- a/searchlib/src/vespa/searchlib/attribute/floatbase.h
+++ b/searchlib/src/vespa/searchlib/attribute/floatbase.h
@@ -71,14 +71,13 @@ protected:
     virtual void load_enum_store(LoadedVector&) {}
     virtual void fillValues(LoadedVector &) {}
     virtual void load_posting_lists(LoadedVector&) {}
+    long onSerializeForAscendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
+    long onSerializeForDescendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
 
     const Change _defaultValue;
 private:
     bool findEnum(const char *value, EnumHandle &e) const override;
     std::vector<EnumHandle> findFoldedEnums(const char *value) const override;
-
-    long onSerializeForAscendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
-    long onSerializeForDescendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
 };
 
 }
diff --git a/searchlib/src/vespa/searchlib/attribute/integerbase.h b/searchlib/src/vespa/searchlib/attribute/integerbase.h
index 3c137c280c2..f60d61cb9df 100644
--- a/searchlib/src/vespa/searchlib/attribute/integerbase.h
+++ b/searchlib/src/vespa/searchlib/attribute/integerbase.h
@@ -68,13 +68,13 @@ protected:
     virtual void load_enum_store(LoadedVector&) {}
     virtual void fillValues(LoadedVector &) {}
     virtual void load_posting_lists(LoadedVector&) {}
+    long onSerializeForAscendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
+    long onSerializeForDescendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
+
     const Change _defaultValue;
 private:
     bool findEnum(const char *value, EnumHandle &e) const override;
     std::vector<EnumHandle> findFoldedEnums(const char *value) const override;
-
-    long onSerializeForAscendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
-    long onSerializeForDescendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
 };
 
 }
diff --git a/searchlib/src/vespa/searchlib/attribute/multinumericattribute.h b/searchlib/src/vespa/searchlib/attribute/multinumericattribute.h
index 32b3c7dbad2..b674b35f459 100644
--- a/searchlib/src/vespa/searchlib/attribute/multinumericattribute.h
+++ b/searchlib/src/vespa/searchlib/attribute/multinumericattribute.h
@@ -54,6 +54,8 @@ protected:
         return array.size();
     }
 
+    long onSerializeForAscendingSort(DocId doc, void* serTo, long available, const common::BlobConverter* bc) const override;
+    long onSerializeForDescendingSort(DocId doc, void* serTo, long available, const common::BlobConverter* bc) const override;
 public:
     MultiValueNumericAttribute(const vespalib::string & baseFileName, const AttributeVector::Config & c =
                                AttributeVector::Config(AttributeVector::BasicType::fromType(T()),
diff --git a/searchlib/src/vespa/searchlib/attribute/multinumericattribute.hpp b/searchlib/src/vespa/searchlib/attribute/multinumericattribute.hpp
index 147fd7dfa91..343a85c2e23 100644
--- a/searchlib/src/vespa/searchlib/attribute/multinumericattribute.hpp
+++ b/searchlib/src/vespa/searchlib/attribute/multinumericattribute.hpp
@@ -5,6 +5,7 @@
 #include "attributevector.hpp"
 #include "multinumericattributesaver.h"
 #include "multi_numeric_search_context.h"
+#include "numeric_sort_blob_writer.h"
 #include "load_utils.h"
 #include "primitivereader.h"
 #include "valuemodifier.h"
@@ -183,4 +184,28 @@ MultiValueNumericAttribute<B, M>::onInitSave(vespalib::stringref fileName)
         (std::move(guard), this->createAttributeHeader(fileName), this->_mvMapping);
 }
 
+template <typename B, typename M>
+long
+MultiValueNumericAttribute<B, M>::onSerializeForAscendingSort(DocId doc, void* serTo, long available, const common::BlobConverter*) const
+{
+    attribute::NumericSortBlobWriter<T, true> writer;
+    auto indices = this->_mvMapping.get(doc);
+    for (auto& v : indices) {
+        writer.candidate(multivalue::get_value(v));
+    }
+    return writer.write(serTo, available);
+}
+
+template <typename B, typename M>
+long
+MultiValueNumericAttribute<B, M>::onSerializeForDescendingSort(DocId doc, void* serTo, long available, const common::BlobConverter*) const
+{
+    attribute::NumericSortBlobWriter<T, false> writer;
+    auto indices = this->_mvMapping.get(doc);
+    for (auto& v : indices) {
+        writer.candidate(multivalue::get_value(v));
+    }
+    return writer.write(serTo, available);
+}
+
 } // namespace search
diff --git a/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.h b/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.h
index 82bb98d5cf2..39f0553bc00 100644
--- a/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.h
+++ b/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.h
@@ -40,6 +40,8 @@ protected:
     using WeightedInt = typename B::BaseClass::WeightedInt;
     using largeint_t = typename B::BaseClass::largeint_t;
 
+    long onSerializeForAscendingSort(DocId doc, void* serTo, long available, const common::BlobConverter* bc) const override;
+    long onSerializeForDescendingSort(DocId doc, void* serTo, long available, const common::BlobConverter* bc) const override;
 public:
     MultiValueNumericEnumAttribute(const vespalib::string & baseFileName, const AttributeVector::Config & cfg);
 
@@ -103,7 +105,6 @@ public:
     // Implements attribute::IMultiValueAttribute
     const attribute::IArrayReadView<T>* make_read_view(attribute::IMultiValueAttribute::ArrayTag<T>, vespalib::Stash& stash) const override;
     const attribute::IWeightedSetReadView<T>* make_read_view(attribute::IMultiValueAttribute::WeightedSetTag<T>, vespalib::Stash& stash) const override;
-
 private:
     using AttributeReader = PrimitiveReader<typename B::LoadedValueType>;
     void loadAllAtOnce(AttributeReader & attrReader, size_t numDocs, size_t numValues);
diff --git a/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.hpp b/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.hpp
index 59c1216829d..9ed2f9241a5 100644
--- a/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.hpp
+++ b/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.hpp
@@ -8,6 +8,7 @@
 #include "loadednumericvalue.h"
 #include "enumerated_multi_value_read_view.h"
 #include "multi_numeric_enum_search_context.h"
+#include "numeric_sort_blob_writer.h"
 #include <vespa/searchlib/query/query_term_simple.h>
 #include <vespa/searchlib/util/fileutil.hpp>
 #include <vespa/vespalib/util/array.hpp>
@@ -145,5 +146,29 @@ MultiValueNumericEnumAttribute<B, M>::getSearch(QueryTermSimple::UP qTerm,
     return std::make_unique<attribute::MultiNumericEnumSearchContext<T, M>>(std::move(qTerm), *this, this->_mvMapping.make_read_view(doc_id_limit), this->_enumStore);
 }
 
+template <typename B, typename M>
+long
+MultiValueNumericEnumAttribute<B, M>::onSerializeForAscendingSort(DocId doc, void* serTo, long available, const common::BlobConverter*) const
+{
+    attribute::NumericSortBlobWriter<T, true> writer;
+    auto indices = this->_mvMapping.get(doc);
+    for (auto& v : indices) {
+        writer.candidate(this->_enumStore.get_value(multivalue::get_value_ref(v).load_acquire()));
+    }
+    return writer.write(serTo, available);
+}
+
+template <typename B, typename M>
+long
+MultiValueNumericEnumAttribute<B, M>::onSerializeForDescendingSort(DocId doc, void* serTo, long available, const common::BlobConverter*) const
+{
+    attribute::NumericSortBlobWriter<T, false> writer;
+    auto indices = this->_mvMapping.get(doc);
+    for (auto& v : indices) {
+        writer.candidate(this->_enumStore.get_value(multivalue::get_value_ref(v).load_acquire()));
+    }
+    return writer.write(serTo, available);
+}
+
 } // namespace search
 
diff --git a/searchlib/src/vespa/searchlib/attribute/multistringattribute.h b/searchlib/src/vespa/searchlib/attribute/multistringattribute.h
index 308ed6f82a3..0e7dd56245e 100644
--- a/searchlib/src/vespa/searchlib/attribute/multistringattribute.h
+++ b/searchlib/src/vespa/searchlib/attribute/multistringattribute.h
@@ -43,6 +43,9 @@ protected:
     using WeightedString = StringAttribute::WeightedString;
     using generation_t = StringAttribute::generation_t;
 
+    long on_serialize_for_sort(DocId doc, void* serTo, long available, const common::BlobConverter* bc, bool asc) const;
+    long onSerializeForAscendingSort(DocId doc, void* serTo, long available, const common::BlobConverter* bc) const override;
+    long onSerializeForDescendingSort(DocId doc, void* serTo, long available, const common::BlobConverter* bc) const override;
 public:
     MultiValueStringAttributeT(const vespalib::string & name, const AttributeVector::Config & c);
     MultiValueStringAttributeT(const vespalib::string & name);
diff --git a/searchlib/src/vespa/searchlib/attribute/multistringattribute.hpp b/searchlib/src/vespa/searchlib/attribute/multistringattribute.hpp
index 7b11fcd59f4..43bb1c5ebb0 100644
--- a/searchlib/src/vespa/searchlib/attribute/multistringattribute.hpp
+++ b/searchlib/src/vespa/searchlib/attribute/multistringattribute.hpp
@@ -6,6 +6,7 @@
 #include "enumattribute.hpp"
 #include "enumerated_multi_value_read_view.h"
 #include "multi_string_enum_hint_search_context.h"
+#include "string_sort_blob_writer.h"
 #include <vespa/vespalib/text/utf8.h>
 #include <vespa/vespalib/text/lowercase.h>
 #include <vespa/searchcommon/attribute/config.h>
@@ -66,5 +67,33 @@ MultiValueStringAttributeT<B, M>::make_read_view(attribute::IMultiValueAttribute
     return &stash.create<attribute::EnumeratedMultiValueReadView<multivalue::WeightedValue<const char*>, M>>(this->_mvMapping.make_read_view(this->getCommittedDocIdLimit()), this->_enumStore);
 }
 
+template <typename B, typename M>
+long
+MultiValueStringAttributeT<B, M>::on_serialize_for_sort(DocId doc, void * serTo, long available, const common::BlobConverter * bc, bool asc) const
+{
+    attribute::StringSortBlobWriter writer(serTo, available, bc, asc);
+    auto indices = this->_mvMapping.get(doc);
+    for (auto& v : indices) {
+        if (!writer.candidate(this->_enumStore.get_value(multivalue::get_value_ref(v).load_acquire()))) {
+            return -1;
+        }
+    }
+    return writer.write();
+}
+
+template <typename B, typename M>
+long
+MultiValueStringAttributeT<B, M>::onSerializeForAscendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const
+{
+    return on_serialize_for_sort(doc, serTo, available, bc, true);
+}
+
+template <typename B, typename M>
+long
+MultiValueStringAttributeT<B, M>::onSerializeForDescendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const
+{
+    return on_serialize_for_sort(doc, serTo, available, bc, false);
+}
+
 } // namespace search
 
diff --git a/searchlib/src/vespa/searchlib/attribute/stringbase.h b/searchlib/src/vespa/searchlib/attribute/stringbase.h
index 98a3316947b..7396a860988 100644
--- a/searchlib/src/vespa/searchlib/attribute/stringbase.h
+++ b/searchlib/src/vespa/searchlib/attribute/stringbase.h
@@ -72,6 +72,8 @@ protected:
     vespalib::MemoryUsage getChangeVectorMemoryUsage() const override;
 
     bool get_match_is_cased() const noexcept;
+    long onSerializeForAscendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
+    long onSerializeForDescendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
 private:
     virtual void load_posting_lists(LoadedVector& loaded);
     virtual void load_enum_store(LoadedVector& loaded);
@@ -80,9 +82,6 @@ private:
     virtual void load_enumerated_data(ReaderBase &attrReader, enumstore::EnumeratedPostingsLoader& loader, size_t num_values);
     virtual void load_enumerated_data(ReaderBase &attrReader, enumstore::EnumeratedLoader& loader);
     virtual void load_posting_lists_and_update_enum_store(enumstore::EnumeratedPostingsLoader& loader);
-
-    long onSerializeForAscendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
-    long onSerializeForDescendingSort(DocId doc, void * serTo, long available, const common::BlobConverter * bc) const override;
 };
 
 }
diff --git a/searchlib/src/vespa/searchlib/common/sortresults.cpp b/searchlib/src/vespa/searchlib/common/sortresults.cpp
index e1b3d6cc0e6..e0701c7f02b 100644
--- a/searchlib/src/vespa/searchlib/common/sortresults.cpp
+++ b/searchlib/src/vespa/searchlib/common/sortresults.cpp
@@ -178,14 +178,8 @@ FastS_SortSpec::Add(IAttributeContext & vecMan, const SortInfo & sInfo)
     } else {
         type = (sInfo._ascending) ? ASC_VECTOR : DESC_VECTOR;
         vector = vecMan.getAttribute(sInfo._field);
-        if ( !vector || vector->hasMultiValue()) {
-            const char * err = "OK";
-            if ( !vector ) {
-                err = "not valid";
-            } else  if ( vector->hasMultiValue()) {
-                err = "multivalued";
-            }
-            Issue::report("sort spec: Attribute vector '%s' is %s. Skipped in sorting", sInfo._field.c_str(), err);
+        if ( !vector) {
+            Issue::report("sort spec: Attribute vector '%s' is not valid. Skipped in sorting", sInfo._field.c_str());
             return false;
         }
     }
@@ -217,6 +211,8 @@ FastS_SortSpec::initSortData(const RankedHit *hits, uint32_t n)
                 variableWidth += 11;
             } else if (!vec._vector->hasMultiValue()) {
                 fixedWidth += numBytes;
+            } else {
+                fixedWidth += (1 + numBytes);
             }
         }
     }
-- 
cgit v1.2.3


From 8d5f95731f06b593129928d9ac1c94737abb278b Mon Sep 17 00:00:00 2001
From: Tor Egge <Tor.Egge@online.no>
Date: Tue, 4 Jul 2023 16:26:00 +0200
Subject: Add helper functions to reduce code duplication.

---
 .../src/vespa/searchlib/attribute/attrvector.h     |  2 ++
 .../src/vespa/searchlib/attribute/attrvector.hpp   | 25 ++++++++++++----------
 .../searchlib/attribute/multinumericattribute.h    |  2 ++
 .../searchlib/attribute/multinumericattribute.hpp  | 19 +++++++++-------
 .../attribute/multinumericenumattribute.h          |  2 ++
 .../attribute/multinumericenumattribute.hpp        | 19 +++++++++-------
 6 files changed, 42 insertions(+), 27 deletions(-)

(limited to 'searchlib/src')

diff --git a/searchlib/src/vespa/searchlib/attribute/attrvector.h b/searchlib/src/vespa/searchlib/attribute/attrvector.h
index 4ee16a044f7..3472f7de5a4 100644
--- a/searchlib/src/vespa/searchlib/attribute/attrvector.h
+++ b/searchlib/src/vespa/searchlib/attribute/attrvector.h
@@ -125,6 +125,8 @@ private:
     uint32_t get(DocId doc, WeightedEnum * v, uint32_t sz)  const override { return getAllEnumHelper(doc, v, sz); }
     uint32_t get(DocId doc, WeightedInt * v, uint32_t sz)   const override { return getAllHelper<WeightedInt, largeint_t>(doc, v, sz); }
     uint32_t get(DocId doc, WeightedFloat * v, uint32_t sz) const override { return getAllHelper<WeightedFloat, double>(doc, v, sz); }
+    template <bool asc>
+    long on_serialize_for_sort(DocId doc, void* serTo, long available) const;
     long onSerializeForAscendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const override;
     long onSerializeForDescendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const override;
 };
diff --git a/searchlib/src/vespa/searchlib/attribute/attrvector.hpp b/searchlib/src/vespa/searchlib/attribute/attrvector.hpp
index 9354473499e..aee6180fcee 100644
--- a/searchlib/src/vespa/searchlib/attribute/attrvector.hpp
+++ b/searchlib/src/vespa/searchlib/attribute/attrvector.hpp
@@ -92,13 +92,11 @@ NumericDirectAttrVector(const vespalib::string & baseFileName)
 }
 
 template <typename F, typename B>
+template <bool asc>
 long
-NumericDirectAttrVector<F, B>::onSerializeForAscendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const
+NumericDirectAttrVector<F, B>::on_serialize_for_sort(DocId doc, void* serTo, long available) const
 {
-    if (!F::IsMultiValue()) {
-        return search::NumericDirectAttribute<B>::onSerializeForAscendingSort(doc, serTo, available, bc);
-    }
-    search::attribute::NumericSortBlobWriter<BaseType, true> writer;
+    search::attribute::NumericSortBlobWriter<BaseType, asc> writer;
     vespalib::ConstArrayRef<BaseType> values(this->_data.data() + this->_idx[doc], this->_idx[doc + 1] - this->_idx[doc]);
     for (auto& v : values) {
         writer.candidate(v);
@@ -106,6 +104,16 @@ NumericDirectAttrVector<F, B>::onSerializeForAscendingSort(DocId doc, void* serT
     return writer.write(serTo, available);
 }
 
+template <typename F, typename B>
+long
+NumericDirectAttrVector<F, B>::onSerializeForAscendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const
+{
+    if (!F::IsMultiValue()) {
+        return search::NumericDirectAttribute<B>::onSerializeForAscendingSort(doc, serTo, available, bc);
+    }
+    return on_serialize_for_sort<true>(doc, serTo, available);
+}
+
 template <typename F, typename B>
 long
 NumericDirectAttrVector<F, B>::onSerializeForDescendingSort(DocId doc, void* serTo, long available, const search::common::BlobConverter* bc) const
@@ -113,12 +121,7 @@ NumericDirectAttrVector<F, B>::onSerializeForDescendingSort(DocId doc, void* ser
     if (!F::IsMultiValue()) {
         return search::NumericDirectAttribute<B>::onSerializeForDescendingSort(doc, serTo, available, bc);
     }
-    search::attribute::NumericSortBlobWriter<BaseType, false> writer;
-    vespalib::ConstArrayRef<BaseType> values(this->_data.data() + this->_idx[doc], this->_idx[doc + 1] - this->_idx[doc]);
-    for (auto& v : values) {
-        writer.candidate(v);
-    }
-    return writer.write(serTo, available);
+    return on_serialize_for_sort<false>(doc, serTo, available);
 }
 
 template <typename F>
diff --git a/searchlib/src/vespa/searchlib/attribute/multinumericattribute.h b/searchlib/src/vespa/searchlib/attribute/multinumericattribute.h
index b674b35f459..f942dc5d358 100644
--- a/searchlib/src/vespa/searchlib/attribute/multinumericattribute.h
+++ b/searchlib/src/vespa/searchlib/attribute/multinumericattribute.h
@@ -54,6 +54,8 @@ protected:
         return array.size();
     }
 
+    template <bool asc>
+    long on_serialize_for_sort(DocId doc, void* serTo, long available) const;
     long onSerializeForAscendingSort(DocId doc, void* serTo, long available, const common::BlobConverter* bc) const override;
     long onSerializeForDescendingSort(DocId doc, void* serTo, long available, const common::BlobConverter* bc) const override;
 public:
diff --git a/searchlib/src/vespa/searchlib/attribute/multinumericattribute.hpp b/searchlib/src/vespa/searchlib/attribute/multinumericattribute.hpp
index 343a85c2e23..ba15782e72a 100644
--- a/searchlib/src/vespa/searchlib/attribute/multinumericattribute.hpp
+++ b/searchlib/src/vespa/searchlib/attribute/multinumericattribute.hpp
@@ -185,10 +185,11 @@ MultiValueNumericAttribute<B, M>::onInitSave(vespalib::stringref fileName)
 }
 
 template <typename B, typename M>
+template <bool asc>
 long
-MultiValueNumericAttribute<B, M>::onSerializeForAscendingSort(DocId doc, void* serTo, long available, const common::BlobConverter*) const
+MultiValueNumericAttribute<B, M>::on_serialize_for_sort(DocId doc, void* serTo, long available) const
 {
-    attribute::NumericSortBlobWriter<T, true> writer;
+    attribute::NumericSortBlobWriter<T, asc> writer;
     auto indices = this->_mvMapping.get(doc);
     for (auto& v : indices) {
         writer.candidate(multivalue::get_value(v));
@@ -196,16 +197,18 @@ MultiValueNumericAttribute<B, M>::onSerializeForAscendingSort(DocId doc, void* s
     return writer.write(serTo, available);
 }
 
+template <typename B, typename M>
+long
+MultiValueNumericAttribute<B, M>::onSerializeForAscendingSort(DocId doc, void* serTo, long available, const common::BlobConverter*) const
+{
+    return on_serialize_for_sort<true>(doc, serTo, available);
+}
+
 template <typename B, typename M>
 long
 MultiValueNumericAttribute<B, M>::onSerializeForDescendingSort(DocId doc, void* serTo, long available, const common::BlobConverter*) const
 {
-    attribute::NumericSortBlobWriter<T, false> writer;
-    auto indices = this->_mvMapping.get(doc);
-    for (auto& v : indices) {
-        writer.candidate(multivalue::get_value(v));
-    }
-    return writer.write(serTo, available);
+    return on_serialize_for_sort<false>(doc, serTo, available);
 }
 
 } // namespace search
diff --git a/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.h b/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.h
index 39f0553bc00..34a8b7cb8d1 100644
--- a/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.h
+++ b/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.h
@@ -40,6 +40,8 @@ protected:
     using WeightedInt = typename B::BaseClass::WeightedInt;
     using largeint_t = typename B::BaseClass::largeint_t;
 
+    template <bool asc>
+    long on_serialize_for_sort(DocId doc, void* serTo, long available) const;
     long onSerializeForAscendingSort(DocId doc, void* serTo, long available, const common::BlobConverter* bc) const override;
     long onSerializeForDescendingSort(DocId doc, void* serTo, long available, const common::BlobConverter* bc) const override;
 public:
diff --git a/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.hpp b/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.hpp
index 9ed2f9241a5..400f94aba29 100644
--- a/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.hpp
+++ b/searchlib/src/vespa/searchlib/attribute/multinumericenumattribute.hpp
@@ -147,10 +147,11 @@ MultiValueNumericEnumAttribute<B, M>::getSearch(QueryTermSimple::UP qTerm,
 }
 
 template <typename B, typename M>
+template <bool asc>
 long
-MultiValueNumericEnumAttribute<B, M>::onSerializeForAscendingSort(DocId doc, void* serTo, long available, const common::BlobConverter*) const
+MultiValueNumericEnumAttribute<B, M>::on_serialize_for_sort(DocId doc, void* serTo, long available) const
 {
-    attribute::NumericSortBlobWriter<T, true> writer;
+    attribute::NumericSortBlobWriter<T, asc> writer;
     auto indices = this->_mvMapping.get(doc);
     for (auto& v : indices) {
         writer.candidate(this->_enumStore.get_value(multivalue::get_value_ref(v).load_acquire()));
@@ -158,16 +159,18 @@ MultiValueNumericEnumAttribute<B, M>::onSerializeForAscendingSort(DocId doc, voi
     return writer.write(serTo, available);
 }
 
+template <typename B, typename M>
+long
+MultiValueNumericEnumAttribute<B, M>::onSerializeForAscendingSort(DocId doc, void* serTo, long available, const common::BlobConverter*) const
+{
+    return on_serialize_for_sort<true>(doc, serTo, available);
+}
+
 template <typename B, typename M>
 long
 MultiValueNumericEnumAttribute<B, M>::onSerializeForDescendingSort(DocId doc, void* serTo, long available, const common::BlobConverter*) const
 {
-    attribute::NumericSortBlobWriter<T, false> writer;
-    auto indices = this->_mvMapping.get(doc);
-    for (auto& v : indices) {
-        writer.candidate(this->_enumStore.get_value(multivalue::get_value_ref(v).load_acquire()));
-    }
-    return writer.write(serTo, available);
+    return on_serialize_for_sort<false>(doc, serTo, available);
 }
 
 } // namespace search
-- 
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