Fix key buffer resizing

1 files changed, 4 insertions, 1 deletions

diff --git a/ydb/library/yql/minikql/comp_nodes/mkql_block_agg.cpp b/ydb/library/yql/minikql/comp_nodes/mkql_block_agg.cpp
index 979a67c473..9d5e76dcb9 100644
--- a/ydb/library/yql/minikql/comp_nodes/mkql_block_agg.cpp
+++ b/ydb/library/yql/minikql/comp_nodes/mkql_block_agg.cpp
@@ -394,7 +394,10 @@ public:
 private:
     void Ensure(size_t delta) {
         if (Pos_ + delta > Vec_.size()) {
-            Vec_.reserve(Max(2 * Vec_.capacity(), Pos_ + delta));
+            if (Pos_ + delta > Vec_.capacity()) {
+                Vec_.reserve(Max(2 * Vec_.capacity(), Pos_ + delta));
+            }
+            // TODO: replace TVector - resize() performs unneeded zeroing here
             Vec_.resize(Pos_ + delta);
         }
     }