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ClickHouse® is a real-time analytics DBMS
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In case of parallel INSERT (max_insert_threads > 1) it is possible for VIEW to be DROP/DETACH'ed while building pipeline for various paralell streams, and in this case the header will not match since when you have VIEW you will got empty header and non-empty header otherwise. And this leads to LOGICAL_ERROR later, while checking that output headers are the same (in QueryPipelineBuilder::addChains() -> Pipe::addChains()). However it also makes the pipeline different for various parallel streams, and it looks like it is better to fail in this case, so instead of always returning empty header from buildChainImpl() explicit check had been added. Note, that I wasn't able to reproduce the issue with the added test, but CI may have more "luck" (although I've verified it manually). Fixes: #35902 Cc: @KochetovNicolai Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com> |
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ClickHouse® is an open-source column-oriented database management system that allows generating analytical data reports in real-time.
Useful Links
- Official website has a quick high-level overview of ClickHouse on the main page.
- Tutorial shows how to set up and query a small ClickHouse cluster.
- Documentation provides more in-depth information.
- YouTube channel has a lot of content about ClickHouse in video format.
- Slack and Telegram allow chatting with ClickHouse users in real-time.
- Blog contains various ClickHouse-related articles, as well as announcements and reports about events.
- Code Browser (Woboq) with syntax highlight and navigation.
- Code Browser (github.dev) with syntax highlight, powered by github.dev.
- Contacts can help to get your questions answered if there are any.
Upcoming events
- v22.8 Release Webinar Original creator, co-founder, and CTO of ClickHouse Alexey Milovidov will walk us through the highlights of the release, provide live demos, and share vision into what is coming in the roadmap.