group_by

A minimal columnar query engine with lazy execution on datasets
larger than RAM. Provides 'dplyr'-like verbs (filter(), select(), mutate(),
group_by(), summarise(), joins, window functions) and common aggregations
(n(), sum(), mean(), min(), max(), sd(), first(), last()) backed by a
pure C11 pull-based execution engine and a custom on-disk format ('.vtr').
Reads and writes 'GeoTIFF' (including tiled and 'BigTIFF' layouts) and a
tiled raster format ('.vec') with overview pyramids and time cubes for
larger-than-RAM raster data.

Gilles Colling

vectra

Columnar Query Engine for Larger-than-RAM Data

group_by function

<dl><dt>.data</dt>
<dd>A <code>vectra_node</code> object.</dd>
<dt>...</dt>
<dd>Grouping column names (unquoted).</dd></dl>

Arguments

Group a vectra query by columns — group_by

<dl>

<dt>.data</dt>
<dd>A <code>vectra_node</code> object.</dd>


<dt>...</dt>
<dd>Grouping column names (unquoted).</dd>

</dl>

group_by: Group a vectra query by columns

Description

Usage

Value

Arguments

Examples