ClickHouse® is a real-time analytics DBMS
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Azat Khuzhin 2ee7cd03e2 Fix merge/OPTIMIZE of SimpleAggregateFunction(LowCardinality)
In AggregatingSortedBlockInputStream LowCardinality type will be
stripped (via RemovingLowCardinalityBlockInputStream), so it should be
stripped in addStreams, since otherwise it will find the stream by the
stream name.

Also addStreams interface should be reworked to accept DataTypePtr
(since recursiveRemoveLowCardinality() wants it).

Fixes: #8515
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ClickHouse — open source distributed column-oriented DBMS

ClickHouse is an open-source column-oriented database management system that allows generating analytical data reports in real time.

  • 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.
  • Blog contains various ClickHouse-related articles, as well as announces and reports about events.
  • 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.