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Fix data race on global BlockStreamProfileInfo in PullingAsyncPipelineExecutor.

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This commit is contained in:
Nikolai Kochetov 2020-11-27 16:50:34 +03:00
parent 1feebe9d73
commit 1c8600bb0a
1 changed files with 8 additions and 2 deletions
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10
src/Processors/Executors/PullingAsyncPipelineExecutor.cpp
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@ -220,9 +220,15 @@ Block PullingAsyncPipelineExecutor::getExtremesBlock()
BlockStreamProfileInfo & PullingAsyncPipelineExecutor::getProfileInfo()
{
if (lazy_format)
return lazy_format->getProfileInfo();
static BlockStreamProfileInfo profile_info;
return lazy_format ? lazy_format->getProfileInfo()
: profile_info;
static std::once_flag flag;
/// Calculate rows before limit here to avoid race.
std::call_once(flag, []() { profile_info.getRowsBeforeLimit(); });
return profile_info;
}
}