Add equal width histogram.

This patch add equal width histogram
for use in assessing predicate selectivity for CBO.
commit_hash:8d2d3a7f89fb9b2261af1b6ba201e8d2a8b098b7

1 files changed, 2 insertions, 0 deletions

diff --git a/yql/essentials/core/yql_statistics.h b/yql/essentials/core/yql_statistics.h
index f3875138f30..e96e8b9f50a 100644
--- a/yql/essentials/core/yql_statistics.h
+++ b/yql/essentials/core/yql_statistics.h
@@ -2,6 +2,7 @@
 
 #include "yql_cost_function.h"
 #include <yql/essentials/core/minsketch/count_min_sketch.h>
+#include <yql/essentials/core/histogram/eq_width_histogram.h>
 
 #include <library/cpp/json/json_reader.h>
 
@@ -36,6 +37,7 @@ struct TColumnStatistics {
     std::optional<double> NumUniqueVals;
     std::optional<double> HyperLogLog;
     std::shared_ptr<NKikimr::TCountMinSketch> CountMinSketch;
+    std::shared_ptr<NKikimr::TEqWidthHistogramEstimator> EqWidthHistogramEstimator;
     TString Type;
 
     TColumnStatistics() {}