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ClickHouse® is a real-time analytics DBMS
a063097fdf
Required columns of the default expression should not be converted to NULL,
since this map value to default and MATERIALIZED values will not work.
Consider the following structure:
- A Nullable(Int64)
- X Int64 materialized coalesce(A, -1)
With recursive_null_as_default=true you will get:
_CAST(coalesce(A, -1), 'Int64') AS X, NULL AS A
And this will ignore default expression.
Fixes: #23524 (Cc: @kssenii)
Fixes: #29729 (Cc: @tavplubix)
Backport: 21.7+
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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 with syntax highlight and navigation.
- Contacts can help to get your questions answered if there are any.