wangbo commented on a change in pull request #1694: optimize V2 BinaryPlainPage
format (#1648)
URL: https://github.com/apache/incubator-doris/pull/1694#discussion_r317008129
##########
File path: be/src/olap/rowset/segment_v2/binary_plain_page.h
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@@ -80,24 +80,21 @@ class BinaryPlainPageBuilder : public PageBuilder {
Slice finish() override {
_finished = true;
- size_t offsets_pos = _buffer.size();
-
- // Set up the header
- encode_fixed32_le(&_buffer[0], _offsets.size());
- encode_fixed32_le(&_buffer[4], offsets_pos);
+ // Set up trailer
+ size_t new_cap = _buffer.size() + _offsets.size() * sizeof(uint32_t) +
MAX_TRAILER_SIZE;
+ if (new_cap > _buffer.capacity())
+ _buffer.GrowArray(new_cap);
Review comment:
when append trailer to buffer_,the size is known,so grow buffer manually can
avoid auto grow which may more than needed(auto grow always expand by at least
50%),this will waste memory
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