In Big Query there is a function array_concat_agg that aggregates array fields by concatenating the arrays. In Snowflake there is a flatten function that can unnest nested arrays into single array. I am looking for similar functionality in duckdb.

select flatten([[1, 2], [2, 3], [4, 5]] would return [1, 2, 2, 3, 4, 5]
I would also need a distinct option:
`select flatten(DISTINCT [[1, 2],

Proposed changes

Issue Number: #7986 #6491

Problem Summary:

Describe the overview of changes.

This PR contains basic usage instruction documents of Doris Manager, including compiling, initializing the platform, space & cluster management and system settings.

Checklist(Required)

1. Does it affect the original behavior: (No)
2. Has unit tests been added: (No Need)
3. Has

Use case:
Postgres compatible tools like Datagrip, DBeaver, etc. want to get (and sometimes set e.g. Azure Data Studio) the datestyle used by the database. It seems like there is already some implementation for that.

Feature description:
As a db tool engineer I want to be able to fetch the set datestyle of a database to be know how to interpret dates in my tool.

extra: ability

Hey everyone!

mapd-core-cpu is already available on conda-forge (https://anaconda.org/conda-forge/omniscidb-cpu)

now we should add some instructions on the documentation.

at this moment it is available for linux and osx.

some additional information about the configuration:

1. for now, always install omniscidb-cpu inside a conda environment (also it is a good practice), eg:

Make WritableFile a derived class of io::OutputStream can remove some duplicate code and make IO system more clear.

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
Currently, UnionAll is only available in DataFusion core, it would be nice to also add this to Ballista.

After risinglightdb/risinglight#464 refactor has been completed, we can remove some prior optimizations in storage crate!

https://github.com/risinglightdb/risinglight/blob/5708a8e2f1d72dd5e7db3c3fb5b93f5c59c348e6/src/storage/chunk.rs#L18-L27

Now ArrayImpl has an Arc inside, so we can safely change the Arc<ArrayImpl> to ArrayImpl in storage chunk with cheap c

Search before asking

• I had searched in the issues and found no similar issues.

What happened

Modify the version in the root pom ,named mybatis-plus-boot-starter to latest

What you expected to happen

There are loopholes.

How to reproduce

There are loopholes.

Anything else

No response

Version

0.6.0

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #

What this PR does / why we need it:

Not Available

Special notes for your reviewer:

Not Available

Additional documentation (e.g. design docs, usage docs, etc.):

Not