The grid (core) · console.warn

compareGroups needs a "by" column to split the rows into two groups.

Printed by The grid (core), prefixed [lattice], since 1.27.0.

Warnings reference › compareGroups:by

Identifier: compareGroups:by
Raised by: The grid (core)
Since: 1.27.0

What happened

compareGroups compares one measure across two groups of rows, and the by column is what splits them. Without it there is nothing to compare and the call returns null.

The fix

Name the grouping column in by.

The smallest fix

grid.statistics.compareGroups({ col: 'revenue', by: 'variant' });

Reference

Covered in full at the API reference.