Data Resource - Virtual Columns

About

virtual columns are columns that contains generated data by data supplier.

Usage

They are most used to:

• add data attributes from the data resource such as its name, its size or its count (via with the meta supplier)
• or to compute expression with the expression data supplier

How to add virtual columns?

Tabulify permits to add virtual columns with:

• the enrich_operation
• the virtual-column tabul option.

Enrich Operation

Enrich is a intermediate pipeline operation that accepts all data suppliers as value source.

virtual-column tabul option

The virtual-column tabul option is a short cut to add a virtual column based only on the meta supplier

The syntax is the following:

--virtual-column "virtualColumnName=dataResourceAttributeName"

where:

• virtualColumnName is the name of the column added
• dataResourceAttributeName is the name of data resource attribute.