6.1.0rc1 - Mixed Chart with Dimensions Set

[aikawa-ohno]

Bug description

・Mixed Chart
・Dimensions Set
・Chart type: Line
In a dashboard that includes the above elements

1. Drill to detail by
   Previously,
   the section that displayed
   “Drill to detail by Dimension Name”
   now displays
   “Drill to detail by undefined

2. Cross Filter
   When you add a dimension to a cross filter,
   an error message stating
   “Filter value list cannot be empty”
   appears on the chart being scoped.

Screenshots/recordings

movie.mp4

Superset version

master / latest-dev

Python version

3.10

Node version

I don't know

Browser

Chrome

Additional context

In the Line Chart,
both “Drill to detail by” and “Cross filter”
will continue to work normally as before.

I suspect this may be due to the fact that, in a Mixed Chart,
when Dimensions are configured,
the display changes
from
Dimensions
to
Metrics, Dimensions.

Checklist

• I have searched Superset docs and Slack and didn't find a solution to my problem.
• I have searched the GitHub issue tracker and didn't find a similar bug report.
• I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.

[dosubot]

Thanks for the detailed bug report! Both issues you're experiencing appear to be related to known Mixed Chart dimension handling problems that affect how series keys and dimension values are extracted.

For the "Drill to detail by undefined" issue: This is likely related to issue #35909, which documents that adding the dimensions field to Mixed Charts causes series key construction problems. There are also related issues with drill-to-detail column label mapping (#34402, #33907) where dimension names aren't resolved correctly.

For the "Filter value list cannot be empty" cross-filter error: PR #30176 added logic to disable cross-filtering when no dimensions are configured, but your issue suggests the inverse problem—cross-filtering fails when dimensions ARE configured. A similar bug was reported for Bar Charts in #37882 where cross-filters emit metric labels instead of dimension values.

Your suspicion is correct—the display change from "Dimensions" to "Metrics, Dimensions" indicates the underlying data structure changed, and the code that extracts dimension values for drill/cross-filter operations may not be handling this correctly.

I'd suggest linking this issue to #35909 as a related regression.

To reply, just mention @dosu.

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[rusackas]

Having a little trouble understanding the bug based on the description. If you happen to have screenshots or video, that might help.

[aikawa-ohno]

@rusackas

Thank you for your comment.
I have created the recorded data and am attaching it below.