From 753ff84a3d436a5c92de8cfe5617bf5c23f02c24 Mon Sep 17 00:00:00 2001
From: Vitaliy Liptchinsky <vitaliy888@fb.com>
Date: Fri, 20 Jan 2017 15:51:21 -0800
Subject: [PATCH] Fix get approx size

Summary:
Fixing GetApproximateSize bug for the case of computing stats for mem tables only.
Closes https://github.com/facebook/rocksdb/pull/1795

Differential Revision: D4445507

Pulled By: IslamAbdelRahman

fbshipit-source-id: 3905846
---
 db/db_impl.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/db/db_impl.cc b/db/db_impl.cc
index 0fbcb4d9d..c1a4760b9 100644
--- a/db/db_impl.cc
+++ b/db/db_impl.cc
@@ -5596,8 +5596,9 @@ void DBImpl::GetApproximateSizes(ColumnFamilyHandle* column_family,
     // Convert user_key into a corresponding internal key.
     InternalKey k1(range[i].start, kMaxSequenceNumber, kValueTypeForSeek);
     InternalKey k2(range[i].limit, kMaxSequenceNumber, kValueTypeForSeek);
+    sizes[i] = 0;
     if (include_flags & DB::SizeApproximationFlags::INCLUDE_FILES) {
-      sizes[i] = versions_->ApproximateSize(v, k1.Encode(), k2.Encode());
+      sizes[i] += versions_->ApproximateSize(v, k1.Encode(), k2.Encode());
     }
     if (include_flags & DB::SizeApproximationFlags::INCLUDE_MEMTABLES) {
       sizes[i] += sv->mem->ApproximateSize(k1.Encode(), k2.Encode());