This Week in Databend #125

Databend is a modern cloud data warehouse, serving your massive-scale analytics needs at low cost and complexity. Open source alternative to Snowflake. Also available in the cloud: https://app.databend.com .

What's New

Stay informed about the latest features of Databend.

Password Policy

Databend has now preliminary support for custom password policies (PASSWORD POLICY) to meet users' security needs. By setting a password policy, you can implement access denial after attempting wrong passwords and set password complexity requirements.

Refer to the following examples:

CREATE PASSWORD POLICY test_policy
    PASSWORD_MIN_LENGTH = 12
    PASSWORD_MAX_LENGTH = 24
    PASSWORD_MIN_UPPER_CASE_CHARS = 2
    PASSWORD_MIN_LOWER_CASE_CHARS = 2
    PASSWORD_MIN_NUMERIC_CHARS = 2
    PASSWORD_MIN_SPECIAL_CHARS = 2
    PASSWORD_MIN_AGE_DAYS = 1
    PASSWORD_MAX_AGE_DAYS = 30
    PASSWORD_MAX_RETRIES = 3
    PASSWORD_LOCKOUT_TIME_MINS = 30
    PASSWORD_HISTORY = 5
    COMMENT = 'this is a test password policy';

ALTER PASSWORD POLICY test_policy UNSET
    PASSWORD_MIN_LENGTH
    PASSWORD_MAX_LENGTH
    PASSWORD_LOCKOUT_TIME_MINS;

CREATE USER user1 IDENTIFIED BY '123456abcDE@!' WITH SET PASSWORD POLICY='test_policy';

ALTER USER user1 IDENTIFIED BY '1456abcDE@!' WITH SET PASSWORD POLICY='test_policy';

This feature is actively being developed, with further support to be provided in the future, including password policy checks at login, to further enhance support.

If you would like to learn more, please contact the Databend team or refer to the resources listed below:

• PR #14012 | feat(query): Support create/alter/drop/desc/show password policy
• Draft PR #14124 | feat(query): Support check password policy when login

Code Corner

Discover some fascinating code snippets or projects that showcase our work or learning journey.

Introducing lychee to Check for Broken Links

Databend currently checks for broken links in the documentation using lychee, an asynchronous, high-performance link checking tool implemented in Rust that can check the response status of links in files. Command-line usage is as follows:

lychee --base . --cache --max-cache-age 1d . --exclude 'https?://twitter\\.com(?:/.*$)?$'

The official lychee-action is also provided for integration with GitHub Actions.

• PR #14100 | ci: add lychee links checker with cache

Highlights

We have also made these improvements to Databend that we hope you will find helpful:

• Added support for decimal type's round / truncate / ceil / floor scalar math functions to support high-precision mathematical operations.
• Added support for reading partitioned Delta Tables.

• CREATE FUNCTION
  
  supports Lambda expressions.
• Added support for

  SHOW VIRTUAL COLUMNS
  
  .

What's Up Next

We're always open to cutting-edge technologies and innovative ideas. You're more than welcome to join the community and bring them to Databend.

Using TPC-DS to Assess the Performance Impact of PRs

Databend currently supports using the

ci-benchmark

Given that Databend fully supports 99 SQL queries of TPC-DS, and that the test suite more accurately reflects business patterns such as report generation, online querying, and data mining, we plan to introduce TPC-DS as part of PR performance assessment in the future.

Issue #13883 | Benchmark: Support TPC-DS ci-benchmark

Please let us know if you're interested in contributing to this feature, or pick up a good first issue at https://link.databend.com/i-m-feeling-lucky to get started.

New Contributors

We always open arms to everyone and can't wait to see how you'll help our community grow and thrive.

• @dqhl76 fixed the broken links in the documentation, #14090.

Changelog

You can check the changelog of Databend Nightly for details about our latest developments.

Full Changelog: https://github.com/datafuselabs/databend/compare/v1.2.258-nightly...v1.2.268-nightly