gaodayue commented on a change in pull request #1694: optimize V2
BinaryPlainPage format (#1648)
URL: https://github.com/apache/incubator-doris/pull/1694#discussion_r317453369
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File path: be/src/olap/rowset/segment_v2/binary_plain_page.h
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@@ -81,24 +81,19 @@ 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);
-
- _buffer.append(&_offsets[0], _offsets.size() * sizeof(uint32_t));
+ // Set up trailer
+ for (int i = 0;i < _offsets.size();i ++) {
+ put_fixed32_le(&_buffer, _offsets[i]);
+ }
+ put_fixed32_le(&_buffer, _offsets.size());
- return Slice(_buffer.data(), _buffer.size());
+ return Slice(_buffer);
}
void reset() override {
_offsets.clear();
_buffer.clear();
- _buffer.resize(MAX_HEADER_SIZE);
_buffer.reserve(_options.data_page_size);
Review comment:
_options.data_page_size could be 0 when there is no limit for page size, in
that case we'd better reserve more than 0 bytes (1024 looks good to me)
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