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ClickHouse® is a real-time analytics DBMS
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INSERT into Distributed with insert_distributed_sync=1 stores the distributed batches on the disk for sending in background. But types may be a little bit different for the Distributed and it's underlying table, so the initiator need to know whether conversion is required or not. Before this patch those on disk distributed batches contains header, which includes dumpStructure() for the block in that batch, however it checks not only names and types and plus dumpStructure() is a debug method. So instead of storing string representation for the block header we should store empty block in the file header (note, that we cannot store the empty block not in header, since this will require reading all blocks from file, due to some trickery of the readers interface). Note, that this patch also contains tiny refactoring: - s/header/distributed_header/ v1: dumpNamesAndTypes() v2: dump empty block into the batch itself v3: move empty block into the header |
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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 quick high-level overview of ClickHouse on main page.
- Tutorial shows how to set up and query 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 to chat with ClickHouse users in real-time.
- Blog contains various ClickHouse-related articles, as well as announcements and reports about events.
- Code Browser with syntax highlight and navigation.
- Contacts can help to get your questions answered if there are any.
- You can also fill this form to meet Yandex ClickHouse team in person.