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Update RollupBlockInputStream.cpp

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alexey-milovidov 2018-09-06 03:58:24 +03:00 committed by GitHub
parent 7f71bc4189
commit 4c549f79cd
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1 changed files with 5 additions and 0 deletions
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5
dbms/src/DataStreams/RollupBlockInputStream.cpp
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@ -43,6 +43,11 @@ Block RollupBlockInputStream::getHeader() const
Block RollupBlockInputStream::readImpl()
{
/** After reading a block from input stream,
* we will subsequently roll it up on next iterations of 'readImpl'
* by zeroing out every column one-by-one and re-merging a block.
*/
if (current_key >= 0)
{
auto & current = rollup_block.getByPosition(keys[current_key]);