From 90c85d9c7df348bf575f53d03acf3ab22affb798 Mon Sep 17 00:00:00 2001
From: muli <muli@cs.cmu.edu>
Date: Sun, 27 Dec 2015 18:47:18 -0500
Subject: [PATCH] allow empty label in rowblackcontainer

---
 src/data/row_block.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/data/row_block.h b/src/data/row_block.h
index c8781e3228..ea709c2ffa 100644
--- a/src/data/row_block.h
+++ b/src/data/row_block.h
@@ -137,7 +137,9 @@ template<typename IndexType>
 inline RowBlock<IndexType>
 RowBlockContainer<IndexType>::GetBlock(void) const {
   // consistency check
-  CHECK_EQ(label.size() + 1, offset.size());
+  if (label.size()) {
+    CHECK_EQ(label.size() + 1, offset.size());
+  }
   CHECK_EQ(offset.back(), index.size());
   CHECK(offset.back() == value.size() || value.size() == 0);
   RowBlock<IndexType> data;