Overview

Selects a subset of columns from an input dataset and forwards it for further processing.

Column selection is usually a pre-step for aggregation.

Input 

The column selection processor operates on any kind of input dataset.

Configuration

Output

The processor returns the selected columns with the same number of entries (lines).

Example

In the following example we're using an accommodation input dataset. The goal is to output the average accommodation price in each city.

Example Input

Workflow

Example Configuration

Result

Selection Result

Aggregation Result

We group by the location and use the average as an aggregation function to get the following result.

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Group By Aggregation Processor