gaodayue commented on a change in pull request #1694: optimize V2 
BinaryPlainPage format (#1648)
URL: https://github.com/apache/incubator-doris/pull/1694#discussion_r317456094
 
 

 ##########
 File path: be/src/olap/rowset/segment_v2/binary_plain_page.h
 ##########
 @@ -63,9 +63,9 @@ class BinaryPlainPageBuilder : public PageBuilder {
         // If the page is full, should stop adding more items.
         while (!is_page_full() && i < *count) {
             auto src = reinterpret_cast<const Slice*>(vals);
+            _buffer.append(src->data, src->size);
             size_t offset = _buffer.size();
             _offsets.push_back(offset);
-            _buffer.append(src->data, src->size);
 
 Review comment:
   `_offsets` record the start offset of each entry, therefore we should first 
record offset then append slice data here.

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