This week in Databend #17

Databend aimed to be an open source elastic and reliable cloud warehouse, it offers blazing fast query and combines elasticity, simplicity, low cost of the cloud, built to make the Data Cloud easy.

Big changes

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

Features

add stage to management by @BohuTANG. (#2984)
support Copy command from stage location into table by @sundy-li. (#2878)
support drop user by @SGZW. (#2913)
support insert select query by @ygf11. (#2765)
add digests functions: md5, sha1, sha256 by @mshauneu (#2881)
add math functions
- inet_aton, sign, round, truncate, rand by @mshauneu (#2862, #2862, #2923, #2989)
- arc, pow, sqrt by @Junnplus (#2888, #2949, #2905)

Improvement

store Database.engine to metasrv by @Veeupup. (#2985)
clickhouse-srv support tuple type by @zhyass. (#2940)
ImmutableCatalog and MutableCatalog by @BohuTANG. (#2930)
add parser on GRANT .. TO database.table by @flaneur2020. (#2901)
asynchronous read partitions by @zhang2014. (#2524)

Bug fixes

bugfix show processlist by @flaneur2020. (#2988)
check read_only when creating/dropping database by @Veeupup. (#2867)
wrong query result when use alias by @miamia0. (#2891)

Tips

Let's learn a weekly tip from Databend.

What's scalar functions

Scalar functions (sometimes referred to as User-Defined Functions / UDFs) return a single value as a return value for each row, not as a result set, and can be used in most places within a query or SET statement, except for the FROM clause.

Want to learn how to add scalar functions to Databend? We have a document discussing this topic. learn more: how to write scalar functions.

Good First Issues

If you are interested in scalar functions that work with strings, you can check #3004. You can comment like: /assignme in the subtask issue to make this subtask assigned to you.

Changlogs

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

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.