as_polars_backend

Converts to a DataBackendPolars using the <a href="https://CRAN.R-project.org/package=polars">polars</a> database, depending on the input type:<ul>
<li><code>data.frame</code>: Creates a new mlr3::DataBackendDataTable first using <code>mlr3::as_data_backend()</code>, then proceeds
with the conversion from mlr3::DataBackendDataTable to DataBackendPolars.</li>
<li>mlr3::DataBackend: Creates a new DataBackendPolars.</li>
</ul>There is no automatic connection to the origin file set.
If the data is obtained using scanning and the data is streamed, a <code>connector</code> can be set manually but is not required.

Extends the 'mlr3' package with a backend to transparently
work with databases such as 'SQLite', 'DuckDB', 'MySQL', 'MariaDB', or
'PostgreSQL'. The package provides three additional backends:
'DataBackendDplyr' relies on the abstraction of package 'dbplyr' to
interact with most DBMS. 'DataBackendDuckDB' operates on 'DuckDB' data
bases and also on Apache Parquet files. 'DataBackendPolars' operates on
'Polars' data frames.

Marc Becker

mlr3db

Data Base Backend for 'mlr3'

Michel Lang

Lona Koers

as_polars_backend function

<dl><dt>data</dt>
<dd>(<code><a href="/link/data.frame()?package=mlr3db&version=0.7.0" data-mini-rdoc="mlr3db::data.frame()">data.frame()</a></code> | mlr3::DataBackend) 
See description.</dd>
<dt>streaming</dt>
<dd>(<code>logical(1)</code>) 
Whether the data should be only scanned (recommended for large data sets) and streamed with
every DataBackendPolars operation or loaded into memory completely.</dd>
<dt>...</dt>
<dd>(<code>any</code>) 
Additional arguments, passed to DataBackendPolars.</dd></dl>

Arguments

Converts to a DataBackendPolars using the <a href='https://CRAN.R-project.org/package=polars'>polars</a> database, depending on the input type:<ul>
<li><code>data.frame</code>: Creates a new mlr3::DataBackendDataTable first using <code>mlr3::as_data_backend()</code>, then proceeds
with the conversion from mlr3::DataBackendDataTable to DataBackendPolars.</li>
<li>mlr3::DataBackend: Creates a new DataBackendPolars.</li>
</ul>

There is no automatic connection to the origin file set.
If the data is obtained using scanning and the data is streamed, a <code>connector</code> can be set manually but is not required.

Convert to Polars Backend — as_polars_backend

<dl>

<dt>data</dt>
<dd>(<code><a href='https://rdrr.io/r/base/data.frame.html'>data.frame()</a></code> | mlr3::DataBackend) 
See description.</dd>


<dt>streaming</dt>
<dd>(<code>logical(1)</code>) 
Whether the data should be only scanned (recommended for large data sets) and streamed with
every DataBackendPolars operation or loaded into memory completely.</dd>


<dt>...</dt>
<dd>(<code>any</code>) 
Additional arguments, passed to DataBackendPolars.</dd>

</dl>

as_polars_backend: Convert to Polars Backend

Description

Usage

Value

Arguments