olap

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],

Search before asking

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

Description

There is a lot of old code in FE, we can do some enhancement.

There are

• replace for(Type thing: things) with things.foreach()

for (String sessionId : sessionIds) {
    XXX
}
->
sessionIds.foreach(ses

Use case:
Concatenate TEXT or to TEXT castable type values using a given separator, for example concatenate address parts by comma.

SELECT concat_ws(',', '535 Mission St.', '14th floor', 'San Francisco', 'CA', '94105') AS address;
--> 535 Mission St., 14th floor, San Francisco, CA 94105

Feature description:
Add support for the `concat_ws ( sep text, val1 "any" [

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:

Enhancement

Now all implementation is included be/src/util/tdigest.h, which will make compile time some long.

Should split these file into header file and source file(be/src/util/tdigest.cpp).

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
Currently, DataFusion creates column names by https://github.com/apache/arrow-datafusion/blob/7be0e268a69ffecbf06823c98ca572733dddb29e/datafusion/src/physical_plan/planner.rs#L91.
The approach has two existing problems:

1. result in potential bugs, such as https://github.com/apache/arrow-

Search before asking

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

Description

Translate the README.md and README.en-US.md into English

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's [Code of Conduct](h

What type of PR is this?

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

Which issue(s) this PR fixes:

issue #2095

What this PR does / why we need it:

Add cosh() built-in function

Special notes for your reviewer:

Not Available

**Additional documentation (e.g. design docs, usage do