Merge 91dad4e into 6cf4565

Author: kunga

ydb/core/tablet_flat/flat_stat_table.cpp

@@ -17,9 +17,6 @@ bool BuildStats(const TSubset& subset, TStats& stats, ui64 rowCountResolution, u
         }
     }
 
-    // TODO: enable b-tree index after benchmarks
-    mixedIndex = true;
-
     return mixedIndex
         ? BuildStatsMixedIndex(subset, stats, rowCountResolution, dataSizeResolution, env, yieldHandler)
         : BuildStatsBTreeIndex(subset, stats, histogramBucketsCount, env, yieldHandler);

ydb/core/tablet_flat/flat_stat_table_btree_index.h

@@ -209,7 +209,9 @@ inline bool BuildStatsBTreeIndex(const TSubset& subset, TStats& stats, ui32 hist
         return false;
     }
 
-    ready &= BuildStatsHistogramsBTreeIndex(subset, stats, histogramBucketsCount, env, yieldHandler);
+    ready &= BuildStatsHistogramsBTreeIndex(subset, stats, 
+        stats.RowCount / histogramBucketsCount, stats.DataSize.Size / histogramBucketsCount, 
+        env, yieldHandler);
 
     return ready;
 }