BTreeIndex Stats Load index nodes

ydb/core/tablet_flat/flat_part_index_iter.h

@@ -97,6 +97,15 @@ class TPartIndexIt : public IIndexIter, public IStatsPartGroupIterator {
         return bool(Iter);
     }
 
+    void AddLastDeltaDataSize(TChanneledDataSize& dataSize) override {
+        Y_DEBUG_ABORT_UNLESS(Index);
+        Y_DEBUG_ABORT_UNLESS(Iter.Off());
+        TPageId pageId = (Iter - 1)->GetPageId();
+        ui64 delta = Part->GetPageSize(pageId, GroupId);
+        ui8 channel = Part->GetGroupChannel(GroupId);
+        dataSize.Add(delta, channel);
+    }
+
     // for precharge and TForward only
     TIndex* TryLoadRaw() {
         return TryGetIndex();

ydb/core/tablet_flat/flat_part_store.h

@@ -85,9 +85,8 @@ class TPartStore : public TPart, public IBundle {
         return EPage(PageCollections[groupId.Index]->PageCollection->Page(id).Type);
     }
 
-    ui8 GetPageChannel(NPage::TPageId id, NPage::TGroupId groupId) const override
+    ui8 GetGroupChannel(NPage::TGroupId groupId) const override
     {
-        Y_UNUSED(id);
         Y_ABORT_UNLESS(groupId.Index < PageCollections.size());
         return PageCollections[groupId.Index]->Id.Channel();
     }

ydb/core/tablet_flat/flat_stat_part.h

@@ -11,24 +11,6 @@
 namespace NKikimr {
 namespace NTable {
 
-struct TPartDataSize {
-    ui64 Size = 0;
-    TVector<ui64> ByChannel = { };
-
-    void Add(ui64 size, ui8 channel) {
-        Size += size;
-        if (!(channel < ByChannel.size())) {
-            ByChannel.resize(channel + 1);
-        }
-        ByChannel[channel] += size;
-    }
-};
-
-struct TPartDataStats {
-    ui64 RowCount = 0;
-    TPartDataSize DataSize = { };
-};
-
 // Iterates over part index and calculates total row count and data size
 // This iterator skips pages that are screened. Currently the logic is simple:
 // if page start key is screened then we assume that the whole previous page is screened
@@ -82,59 +64,62 @@ class TStatsScreenedPartIterator {
         return Groups[0]->IsValid();
     }
 
-    EReady Next(TPartDataStats& stats) {
+    EReady Next(TDataStats& stats) {
         Y_ABORT_UNLESS(IsValid());
 
-        auto curPageId = Groups[0]->GetPageId();
         LastRowId = Groups[0]->GetRowId();
         auto ready = Groups[0]->Next();
         if (ready == EReady::Page) {
+            Y_DEBUG_ABORT_UNLESS(false, "Shouldn't really happen");
             return ready;
         }
 
         ui64 rowCount = CountUnscreenedRows(GetLastRowId(), GetCurrentRowId());
         stats.RowCount += rowCount;
         if (rowCount) {
-            AddPageSize(stats.DataSize, curPageId, TGroupId(0));
+            Groups[0]->AddLastDeltaDataSize(stats.DataSize);
         }
 
         TRowId nextRowId = ready == EReady::Data ? Groups[0]->GetRowId() : Max<TRowId>();
         for (auto groupIndex : xrange<ui32>(1, Groups.size())) {
             while (Groups[groupIndex]->IsValid() && Groups[groupIndex]->GetRowId() < nextRowId) {
                 // eagerly include all data up to the next row id
-                if (rowCount) {
-                    AddPageSize(stats.DataSize, Groups[groupIndex]->GetPageId(), TGroupId(groupIndex));
-                }
                 if (Groups[groupIndex]->Next() == EReady::Page) {
+                    Y_DEBUG_ABORT_UNLESS(false, "Shouldn't really happen");
                     ready = EReady::Page;
                     break;
                 }
+                if (rowCount) {
+                    Groups[groupIndex]->AddLastDeltaDataSize(stats.DataSize);
+                }
             }
         }
 
         if (HistoricGroups) {
             Y_DEBUG_ABORT_UNLESS(Part->Scheme->HistoryGroup.ColsKeyIdx.size() == 3);
             while (HistoricGroups[0]->IsValid() && (!HistoricGroups[0]->GetKeyCellsCount() || HistoricGroups[0]->GetKeyCell(0).AsValue<TRowId>() < nextRowId)) {
                 // eagerly include all history up to the next row id
-                if (rowCount) {
-                    AddPageSize(stats.DataSize, HistoricGroups[0]->GetPageId(), TGroupId(0, true));
-                }
                 if (HistoricGroups[0]->Next() == EReady::Page) {
+                    Y_DEBUG_ABORT_UNLESS(false, "Shouldn't really happen");
                     ready = EReady::Page;
                     break;
                 }
+                if (rowCount) {
+                    HistoricGroups[0]->AddLastDeltaDataSize(stats.DataSize);
+                }
             }
             TRowId nextHistoryRowId = HistoricGroups[0]->IsValid() ? HistoricGroups[0]->GetRowId() : Max<TRowId>();
             for (auto groupIndex : xrange<ui32>(1, Groups.size())) {
                 while (HistoricGroups[groupIndex]->IsValid() && HistoricGroups[groupIndex]->GetRowId() < nextHistoryRowId) {
                     // eagerly include all data up to the next row id
-                    if (rowCount) {
-                        AddPageSize(stats.DataSize, HistoricGroups[groupIndex]->GetPageId(), TGroupId(groupIndex, true));
-                    }
                     if (HistoricGroups[groupIndex]->Next() == EReady::Page) {
+                        Y_DEBUG_ABORT_UNLESS(false, "Shouldn't really happen");
                         ready = EReady::Page;
                         break;
                     }
+                    if (rowCount) {
+                        HistoricGroups[groupIndex]->AddLastDeltaDataSize(stats.DataSize);
+                    }
                 }
             }
         }
@@ -174,13 +159,6 @@ class TStatsScreenedPartIterator {
         return LastRowId;
     }
 
-    void AddPageSize(TPartDataSize& stats, TPageId pageId, TGroupId groupId) const {
-        // TODO: move to IStatsPartGroupIterator
-        ui64 size = Part->GetPageSize(pageId, groupId);
-        ui8 channel = Part->GetPageChannel(pageId, groupId);
-        stats.Add(size, channel);
-    }
-
     void FillKey() {
         CurrentKey.clear();
 
@@ -229,7 +207,7 @@ class TStatsScreenedPartIterator {
         return rowCount;
     }
 
-    void AddBlobsSize(TPartDataSize& stats, const TFrames* frames, ELargeObj lob, ui32 &prevPage) noexcept {
+    void AddBlobsSize(TChanneledDataSize& stats, const TFrames* frames, ELargeObj lob, ui32 &prevPage) noexcept {
         const auto row = GetLastRowId();
         const auto end = GetCurrentRowId();