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dbms: addition [#METR-19025].

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This commit is contained in:
Alexey Milovidov 2015-11-27 23:50:48 +03:00
parent 7e5b79fbe9
commit e64197d436
1 changed files with 14 additions and 1 deletions
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15
dbms/src/DataStreams/MergingSortedBlockInputStream.cpp
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@ -131,6 +131,7 @@ void MergingSortedBlockInputStream::merge(ColumnPlainPtrs & merged_columns, std:
++total_merged_rows;
if (limit && total_merged_rows == limit)
{
// std::cerr << "Limit reached\n";
cancel();
finished = true;
return true;
@ -138,7 +139,10 @@ void MergingSortedBlockInputStream::merge(ColumnPlainPtrs & merged_columns, std:
++merged_rows;
if (merged_rows == max_block_size)
{
// std::cerr << "max_block_size reached\n";
return true;
}
return false;
};
@ -151,30 +155,39 @@ void MergingSortedBlockInputStream::merge(ColumnPlainPtrs & merged_columns, std:
while (true)
{
// std::cerr << "total_merged_rows: " << total_merged_rows << ", merged_rows: " << merged_rows << "\n";
// std::cerr << "Inserting row\n";
for (size_t i = 0; i < num_columns; ++i)
merged_columns[i]->insertFrom(*current->all_columns[i], current->pos);
if (!current->isLast())
{
// std::cerr << "moving to next row\n";
current->next();
if (!queue.empty() && !(current < queue.top()))
if (queue.empty() || !(current < queue.top()))
{
if (count_row_and_check_limit())
{
// std::cerr << "pushing back to queue\n";
queue.push(current);
return;
}
/// Не кладём курсор обратно в очередь, а продолжаем работать с текущим курсором.
// std::cerr << "current is still on top, using current row\n";
continue;
}
else
{
// std::cerr << "next row is not least, pushing back to queue\n";
queue.push(current);
}
}
else
{
/// Достаём из соответствующего источника следующий блок, если есть.
// std::cerr << "It was last row, fetching next block\n";
fetchNextBlock(current, queue);
}