This Week in Databend #104

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 On In Databend

Stay connected with the latest news about Databend.

Loading Data with Kafka

Apache Kafka is an open-source distributed event streaming platform that allows you to publish and subscribe to streams of records.

Databend provides an efficient data ingestion tool (bend-ingest-kafka), specifically designed to load data from Kafka into Databend.

If you are interested in learning more, please check out the resources listed below.

• Docs | Loading Data with Tools - Kafka

Loading Data with dbt

dbt is a transformation workflow that helps you get more work done while producing higher quality results.

dbt-databend-cloud is a plugin developed by Databend. By utilizing this plugin, you can seamlessly perform data modeling, transformation, and cleansing tasks using dbt and conveniently load the output into Databend.

If you are interested in learning more, please check out the resources listed below.

• Docs | Loading Data with Tools - dbt

Code Corner

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

Developing with Databend using Node.js

Databend now provides Databend Driver Node.js Binding, which means you can easily build and integrate applications with Databend using Node.js.

const { Client } = require('databend-driver');

const dsn = process.env.DATABEND_DSN
  ? process.env.DATABEND_DSN
  : 'databend://user1:abc123@localhost:8000/default?sslmode=disable';

async function create_conn() {
  this.client = new Client(dsn);
  this.conn = await this.client.getConn();
  console.log('Connected to Databend Server!');
}

async function select_books() {
  var sql =
    'CREATE TABLE IF NOT EXISTS books(title VARCHAR, author VARCHAR, date VARCHAR)';
  await this.conn.exec(sql);
  console.log('Table created');

  var sql =
    "INSERT INTO books VALUES('Readings in Database Systems', 'Michael Stonebraker', '2004')";
  await this.conn.exec(sql);
  console.log('1 record inserted');

  var sql = 'SELECT * FROM books';
  const rows = await this.conn.queryIter(sql);
  const ret = [];
  let row = await rows.next();
  while (row) {
    ret.push(row.values());
    row = await rows.next();
  }
  console.log(ret);
}

create_conn().then((conn) => {
  select_books();
});

If you are interested in learning more, please check out the resources listed below:

• Docs | Developing with Databend using Node.js
• GitHub | Databend Driver Node.js Binding

Highlights

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

• Added support for

  GROUP BY ALL
  
  .
• Added the capability to speed up Common Table Expressions (CTEs) by materialization.
• Added Geo functions:

  h3_to_geo
  
  ,

  h3_to_geo_boundary
  
  ,

  h3_k_ring
  
  ,

  h3_is_valid
  
  ,

  h3_get_resolution
  
  ,

  h3_edge_length_m
  
  and

  h3_edge_length_km
  
  .
• Added array lambda functions:

  array_transform
  
  ,

  array_apply
  
  and

  array_filter
  
  .

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.

Copying Files from One Stage to Another

Databend now supports analysis capabilities for over a dozen different storage service providers. This opens up more possibilities for data management, and copying files from one stage to another can be a beneficial starting point.

copy files from @mystage1/path/ to @mystage2;
copy files from @mystage1/path/f1.csv to @mystage2/archive/[f1.csv];

Issue #12200 | Feature: support copy files from one stage to other stage

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.

Changelog

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

Full Changelog: https://github.com/datafuselabs/databend/compare/v1.2.32-nightly...v1.2.42-nightly