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slightly optimize very short queries with LowCardinality
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@ -43,11 +43,13 @@ MergeTreeReaderStream::MergeTreeReaderStream(
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/// If the end of range is inside the block, we will need to read it too.
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if (right_mark < marks_count && marks_loader.getMark(right_mark).offset_in_decompressed_block > 0)
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{
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while (right_mark < marks_count
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&& marks_loader.getMark(right_mark).offset_in_compressed_file == marks_loader.getMark(mark_range.end).offset_in_compressed_file)
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auto indices = ext::range(right_mark, marks_count);
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auto it = std::upper_bound(indices.begin(), indices.end(), right_mark, [this](size_t i, size_t j)
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{
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++right_mark;
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}
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return marks_loader.getMark(i).offset_in_compressed_file < marks_loader.getMark(j).offset_in_compressed_file;
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});
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right_mark = (it == indices.end() ? marks_count : *it);
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}
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size_t mark_range_bytes;
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