Ensure children are sorted by falling tree size.

1 files changed, 2 insertions, 0 deletions

diff --git a/searchlib/src/vespa/searchlib/attribute/document_weight_or_filter_search.cpp b/searchlib/src/vespa/searchlib/attribute/document_weight_or_filter_search.cpp
index 413f4947dbe..c1e7dc39169 100644
--- a/searchlib/src/vespa/searchlib/attribute/document_weight_or_filter_search.cpp
+++ b/searchlib/src/vespa/searchlib/attribute/document_weight_or_filter_search.cpp
@@ -75,6 +75,8 @@ DocumentWeightOrFilterSearch::create(std::vector<DocumentWeightIterator>&& child
     if (children.empty()) {
         return std::make_unique<queryeval::EmptySearch>();
     } else {
+        std::sort(children.begin(), children.end(),
+                  [](const auto & a, const auto & b) { return a.size() > b.size(); });
         return std::make_unique<DocumentWeightOrFilterSearchImpl>(AttributeIteratorPack(std::move(children)));
     }
 }