Blog

This Week in Databend #72

PsiACEDec 14, 2022

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 New

Check out what we've done this week to make Databend even better for you.

Features & Improvements ✨

Multiple Catalogs

extends show databases SQL (#9152)

Stage

support select from URI (#9247)

Streaming Load

support
```
file_format
```
syntax in streaming load insert sql (#9063)

Planner

push down
```
limit
```
to
```
union
```
(#9210)

Query

use
```
analyze table
```
instead of
```
optimize table statistic
```
(#9143)
fast parse insert values (#9214)

Storage

use distinct count calculated by the xor hash function (#9159)
```
read_parquet
```
read meta before read data (#9154)
push down filter to parquet reader (#9199)
prune row groups before reading (#9228)

Open Sharing

add prototype open sharing and add sharing stateful tests (#9177)

Code Refactoring 🎉

simplify the global data registry logic (#9187)

Storage

refactor deletion (#8824)

Build/Testing/CI Infra Changes 🔌

release databend deb package and databend with hive (#9138, #9241, etc.)

Bug Fixes 🔧

Format

support ASCII control code hex as format field delimiter (#9160)

Planner

prewhere_column empty and predicate is not const will return empty (#9116)
don't push down topk to Merge when it's child is Aggregate (#9183)
fix nullable column validity not equal (#9220)

Query

address unit test hang on test_insert (#9242)

Storage

too many io requests for read blocks during compact (#9128)
collect orphan snapshots (#9108)

What's On In Databend

Stay connected with the latest news about Databend.

Breaking Change: Unified File Format Options

To simplify, we're rolling out a set of unified file format options as follows for the COPY INTO command, the Streaming Load API, and all the other cases where users need to describe their file formats:

[ FILE_FORMAT = ( TYPE = { CSV | TSV | NDJSON | PARQUET | XML} [ formatTypeOptions ] ) ]

Please note that the current format options starting with
```
format_*
```
will be deprecated.
```
... FORMAT CSV ...
```
will still be accepted by the ClickHouse handler.
Support for customized formats created by
```
CREATE FILE FORMAT ...
```
will be added in a future release:
```
... FILE_FORMAT = (format_name = 'MyCustomCSV') ....
```
.

Learn More

Open Sharing is a simple and secure data-sharing protocol designed for databend-query nodes running in a multi-cloud environment.

Simple & Free: Open Sharing is open-source and basically a RESTful API implementation.
Secure: Open Sharing verifies incoming requesters' identities and access permissions, and provides an audit log.
Multi-Cloud: Open Sharing supports a variety of public cloud platforms, including AWS, Azure, GCP, etc.

Learn More

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.

We're about to run stage-related tests again using the Streaming Load API to move files to a stage instead of an AWS command like this:

aws --endpoint-url ${STORAGE_S3_ENDPOINT_URL} s3 cp s3://testbucket/admin/data/ontime_200.csv s3://testbucket/admin/stage/internal/s1/ontime_200.csv >/dev/null 2>&1

This is because Databend users do not need to take care of, or do not even know the stage paths that the AWS command requires.

Issue 8528: refactor stage related tests

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