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This commit is contained in:
Nikita Vasilev 2019-02-06 11:17:57 +03:00
parent 258367c1dd
commit c3f7344824
1 changed files with 9 additions and 8 deletions
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17
dbms/src/Storages/MergeTree/MergeTreeReaderStream.h
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@ -9,28 +9,29 @@
namespace DB
{
/// Class for reading a single conlumn (or index).
class MergeTreeReaderStream
{
public:
MergeTreeReaderStream(
const String &path_prefix_, const String &extension_, size_t marks_count_,
const MarkRanges &all_mark_ranges,
MarkCache *mark_cache, bool save_marks_in_cache,
UncompressedCache *uncompressed_cache,
const String & path_prefix_, const String & extension_, size_t marks_count_,
const MarkRanges & all_mark_ranges,
MarkCache * mark_cache, bool save_marks_in_cache,
UncompressedCache * uncompressed_cache,
size_t aio_threshold, size_t max_read_buffer_size,
const ReadBufferFromFileBase::ProfileCallback &profile_callback, clockid_t clock_type);
const ReadBufferFromFileBase::ProfileCallback & profile_callback, clockid_t clock_type);
void seekToMark(size_t index);
void seekToStart();
ReadBuffer *data_buffer;
ReadBuffer * data_buffer;
private:
MergeTreeReaderStream() = default;
/// NOTE: lazily loads marks from the marks cache.
const MarkInCompressedFile &getMark(size_t index);
const MarkInCompressedFile & getMark(size_t index);
void loadMarks();
@ -39,7 +40,7 @@ private:
size_t marks_count;
MarkCache *mark_cache;
MarkCache * mark_cache;
bool save_marks_in_cache;
MarkCache::MappedPtr marks;