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better comment for MergeTreeRangeReader

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Nikolai Kochetov 2017-07-11 20:59:07 +03:00 committed by alexey-milovidov
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commit 8ea812e669
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dbms/src/Storages/MergeTree/MergeTreeRangeReader.h
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@ -8,6 +8,8 @@ namespace DB
class MergeTreeReader;
/// MergeTreeReader iterator which allows sequential reading for arbitrary number of rows between pairs of marks in the same part.
/// Stores reading state, which can be inside granule. Can skip rows in current granule and start reading from next mark.
/// Used generally for reading number of rows less than index granularity to decrease cache misses for fat blocks.
class MergeTreeRangeReader
{
public: