Vertical Markers

[raydiator2]

Is there are way with bar graphs, to have vertical markers? With annotations I can see you can say y=20 to get a horizontal marker at y=20 but I can't figure out how to do it vertically. This is for discrete (non time) datasets. I want to look at a histogram (made out of sql query as the inbuilt histogram doesn't bin as nicely) but I want to add max and minimum limits to visually see how much is outside the process limits

[dosubot[bot]]

Hi @raydiator2! I'm Dosu and I’m helping the superset team.

Vertical markers (vertical lines at specific x-values) are not natively supported on bar or histogram charts for discrete (non-time) datasets in Superset. The annotation system and chart plugins currently only support horizontal markers (y=constant lines) and reference lines for numeric or time axes, not categorical x-axes or discrete bins see code details.

To visually indicate process limits (like min/max boundaries), you can try these workarounds:

• Encode your process limits as special bars in your SQL query, so they appear as distinct bars in the chart.
• Use color coding in your SQL or chart config to highlight bins outside the limits.
• Add an extra series to represent limits, for example, by creating a dummy bar with a unique color at the boundary categories.

Implementing true vertical marker lines would require customizing the ECharts plugin code to expose ECharts' markLine feature for categorical axes, which is not available in the UI or config today see annotation system details.

If you need more advanced visual cues, you may need to extend the chart plugin logic or request this feature from the Superset community.

To reply, just mention @dosu.

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[fin-gal]

I'm in exactly the same situation and very interested in this.