Databend is a powerful cloud data warehouse. Built for elasticity and efficiency. Free and open. Also available in the cloud: https://app.databend.com .

What's Changed

Below is a list of some major changes that we don't want you to miss.

Exciting New Features ✨

sharing

  • add shared layer to read data from sharing endpoint (#8044)

planner

  • top-down optimization (#8080)
  • convert outer join to inner join (#7967)
  • convert mark join to semi join (#8064)
  • support EXPLAIN MEMO statement (#8125)

storage

  • parallel index pruning (#7893)
  • oss backend support (#8066 & #8079)
  • try to get segments parallel (#8076)
  • table column statistics api (#8152)

new expression

  • migrate agg function: stddev, window_funnel to func-v2 (#8034)
  • migrate variant func to func-v2 (#7972)
  • numeric/string can cast to boolean when it's in filter (#8051)
  • support Date and Interval in new expression framework (#8058)
  • add take_chunks kernel (#8137)

Code Refactor 🎉

cache

  • remove not used disk cache (#8166)

meta

  • move MetaStorageError to a standalone crate (#8161)

query

  • remove precision in timestamp type (#8154)

deps

  • move several common dependency declarations to workspace Cargo.toml (#8171)

Build/Testing/CI Infra Changes 🔌

ci

Thoughtful Bug Fix 🔧

build

  • fix build failure on newer versions of protoc (#8047)

datavalues

  • only_null for nullable column should return false when column is empty (#8045)

parser

pipelines

  • right semi join returns wrong answer (#8083)
  • support interrupt join build side (#8037)

storage

  • using table owned dal operator instead of get from query context (#8113)
  • pruning not work as expected (#8131)

new expression

  • properly repeat Scalar::Null to column (#8111)

News

Let's take a look at what's new at Datafuse Labs & Databend each week.

EXPLAIN MEMO

Databend supports EXPLAIN MEMO statement to visualize memo structure now.

Syntax

EXPLAIN MEMO <query_statement>

explain memo

Learn More

Tips on PRESIGN

Since #6529 was merged, Databend supports PRESIGN to generate the pre-signed URL for a staged file.

PRESIGN [{ DOWNLOAD | UPLOAD }] @<stage_name>/.../<file_name> [ EXPIRE = <expire_in_seconds> ]

[{ DOWNLOAD | UPLOAD }] specifies that the pre-signed URL is used for download or upload. So once you have the corresponding pre-signed URL, you can use curl to download or upload the file.

# download
curl '<pre-signed-url>' -o <file_name>
# upload
curl -F '[email protected]<file_path>' -XPUT '<pre-signed-url>'

Learn More

Remove Precision in Timestamp Type

Timestamp datatype now keep the precision which can be used to output the DateTime with a custom style.

The storage stores the same value for now() which represents instants as the number of microseconds (µs) since 1970-01-01 00:00:00+00. The precision is only for output style, so it's useless to keep it in datatype, we can use other functions like: to_yyyy_mm_dd to handle the style.

Learn More

Changelogs

You can check the changelogs of Databend nightly to learn about our latest developments.

Contributors

Thanks a lot to the contributors for their excellent work this week.

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Meet Us

Please join the DatafuseLabs Community if you are interested in Databend.

We are looking forward to seeing you try our code. We have a strong team behind you to ensure a smooth experience in trying our code for your projects. If you are a hacker passionate about database internals, feel free to play with our code.

You can submit issues for any problems you find. We also highly appreciate any of your pull requests.