Add stub to Defrag compressed set with default return value

Signed-off-by: Abhijat Malviya <[email protected]>

Author: abhijat

src/core/search/block_list.cc

@@ -2,20 +2,6 @@
 
 #include "core/page_usage/page_usage_stats.h"
 
-namespace {
-
-template <typename T>
-using CanDefragmentT = decltype(std::declval<T>().Defragment(std::declval<size_t>(),
-                                                             std::declval<dfly::PageUsage*>()));
-
-template <typename, typename = void> struct CanDefragment : std::false_type {};
-
-template <typename T> struct CanDefragment<T, std::void_t<CanDefragmentT<T>>> : std::true_type {};
-
-template <typename T> inline constexpr bool CanDefragmentV = CanDefragment<T>::value;
-
-}  // namespace
-
 namespace dfly::search {
 
 using namespace std;
@@ -147,11 +133,9 @@ DefragmentResult BlockList<Container>::Defragment(PageUsage* page_usage) {
     result.objects_moved += 1;
   }
 
-  if constexpr (CanDefragmentV<Container>) {
-    for (Container& block : blocks_) {
-      if (result.Merge(block.Defragment(quota_usec, page_usage)).quota_depleted) {
-        break;
-      }
+  for (Container& block : blocks_) {
+    if (result.Merge(block.Defragment(page_usage)).quota_depleted) {
+      break;
     }
   }
   return result;

src/core/search/compressed_sorted_set.h

@@ -91,6 +91,10 @@ class CompressedSortedSet {
     return tail_value_.value();
   }
 
+  static DefragmentResult Defragment([[maybe_unused]] PageUsage* page_usage) {
+    return {};
+  }
+
  private:
   struct EntryLocation {
     IntType value;                        // Value or 0