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Posted to notifications@superset.apache.org by "dosubot[bot] (via GitHub)" <gi...@apache.org> on 2026/05/02 03:23:22 UTC
Re: [D] Formulas in Superset [superset]
GitHub user dosubot[bot] edited a comment on the discussion: Formulas in Superset
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Superset supports formula-based annotations on timeseries charts using mathjs, so you can overlay a formula (with time as the variable `x`) on your chart—for example, to show a trend or threshold line. However, Superset does not currently let you create new chart series from formulas directly in the chart UI, like combining two series to compute a percentage as you would in PostHog. To achieve calculations like "percentage of rows matching a filter over time," you typically need to define a new metric (using SQL or your dataset's expression builder) that computes this ratio, and then plot that metric as a series in your chart.
There are also built-in options for showing contributions or percentages in some chart types, but these are not as flexible as free-form formulas. Formula annotations are for overlays, not for generating new data series from existing ones in the UI. For more details, see the [formula annotation implementation](https://github.com/apache/superset/blob/93583220a7aa4debeaf3fd4a6cade9f771ee8c2f/superset-frontend/src/explore/components/controls/AnnotationLayerControl/AnnotationLayer.jsx) and [how formulas are applied in timeseries charts](https://github.com/apache/superset/blob/93583220a7aa4debeaf3fd4a6cade9f771ee8c2f/superset-frontend/plugins/plugin-chart-echarts/src/Timeseries/transformers.ts).
If you want to dynamically filter your data, Superset does support applying extra filters to charts via URL parameters, which can help with ad hoc analysis but doesn't provide formula composition in the UI.
Let me know if you want more details on defining metrics or using formula annotations!
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GitHub link: https://github.com/apache/superset/discussions/33842#discussioncomment-13532449
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