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Better invariants

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This commit is contained in:
alesapin 2022-01-30 20:40:09 +03:00
parent c237c03c50
commit 4bedcc19b5
2 changed files with 11 additions and 4 deletions
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12
src/Storages/MergeTree/MergeTreeReaderStream.cpp
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@ -42,7 +42,7 @@ MergeTreeReaderStream::MergeTreeReaderStream(
{
size_t left_mark = mark_range.begin;
size_t right_mark = mark_range.end;
auto [right_offset, mark_range_bytes] = getRightOffsetAndBytesRange(left_mark, right_mark);
auto [_, mark_range_bytes] = getRightOffsetAndBytesRange(left_mark, right_mark);
max_mark_range_bytes = std::max(max_mark_range_bytes, mark_range_bytes);
sum_mark_range_bytes += mark_range_bytes;
@ -111,6 +111,14 @@ std::pair<size_t, size_t> MergeTreeReaderStream::getRightOffsetAndBytesRange(siz
/// NOTE: if we are reading the whole file, then right_mark == marks_count
/// and we will use max_read_buffer_size for buffer size, thus avoiding the need to load marks.
/// Special case, can happen in Collapsing/Replacing engines
if (marks_count == 0)
return std::make_pair(0, 0);
assert(left_mark < marks_count);
assert(right_mark_non_included <= marks_count);
assert(left_mark <= right_mark_non_included);
size_t result_right_offset;
if (0 < right_mark_non_included && right_mark_non_included < marks_count)
{
@ -235,7 +243,7 @@ void MergeTreeReaderStream::adjustForRange(MarkRange range)
* read from stream, but we must update last_right_offset only if it is bigger than
* the last one to avoid redundantly cancelling prefetches.
*/
auto [right_offset, mark_range_bytes] = getRightOffsetAndBytesRange(range.begin, range.end);
auto [right_offset, _] = getRightOffsetAndBytesRange(range.begin, range.end);
if (!right_offset)
{
if (last_right_offset && *last_right_offset == 0)

3
src/Storages/MergeTree/MergeTreeSequentialSource.cpp
View File

@ -80,8 +80,7 @@ try
const auto & sample = reader->getColumns();
Columns columns(sample.size());
/// TODO: pass stream size instead of zero?
size_t rows_read = reader->readRows(current_mark, 0, continue_reading, rows_to_read, columns);
size_t rows_read = reader->readRows(current_mark, data_part->getMarksCount(), continue_reading, rows_to_read, columns);
if (rows_read)
{