Add declaration for BTreeNodeAggregatedWrap<MinMaxAggregated>::_instance.
@@ -161,6 +161,7 @@ public:
static const NoAggregated &getEmptyAggregated() { return _instance; }
};
+template <> MinMaxAggregated BTreeNodeAggregatedWrap<MinMaxAggregated>::_instance;
template <typename KeyT, uint32_t NumSlots>
class BTreeNodeT : public BTreeNode {
