ECharts Bar Chart renders only currency symbol ($) when Show Value is enabled with stacked bars

[mandar0324]

Bug description

Superset version:
5.0.0

Chart type:
ECharts Bar Chart

Configuration:

• Stacked bar
• Show Value enabled
• Currency prefix ($)
• Near-zero negative values
• Row limit: 50

Steps to reproduce:

1. Create dataset with mostly small negative values (e.g. -1 to -5)
2. Add one large negative outlier (e.g. -4,000,000)
3. Create ECharts Bar Chart
4. Enable stacked bars
5. Enable "Show Value"
6. Apply currency prefix ($)

Expected behavior:
Numeric values should render correctly with currency formatting (e.g., $1,234), and should not display only the currency symbol.

Actual behavior:
Only the currency symbol "$" is rendered repeatedly without numeric values, particularly for near-zero values.
Occurs in both horizontal and vertical orientation.

warehouse_handling_dummy_data.csv

Browser:
Google Chrome 143.0.7499.193 (Official Build) (arm64)

Screenshots/recordings

No response

Superset version

master / latest-dev

Python version

3.9

Node version

16

Browser

Chrome

Additional context

No response

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]

Hi @mandar0324! I'm Dosu and I’m helping the superset team.

Thanks for the detailed bug report! I looked into the code and found a likely root cause.

The issue: When your near-zero negative values (e.g., -1 to -5) are formatted alongside a large outlier (-4,000,000), Superset uses the SMART_NUMBER formatter which applies SI notation. For very small values relative to the scale, this can produce strings like $-1µ or $-100n where the micro (µ) or nano (n) symbols may not render correctly in the ECharts label, leaving only the $ visible.

Additionally, the stacked bar threshold logic calculates percentage thresholds to filter which values display labels. With a massive outlier dominating the scale, your near-zero values become an extremely small percentage, potentially triggering edge cases.

Workaround: Try overriding the default number format with an explicit d3-format string (e.g., $,.0f or $,.2f) instead of relying on the adaptive SMART_NUMBER format. This should prevent SI notation from being used for small values.

There have been recent fixes in this area (#37039, #36989) for related currency formatting issues, so this may be a new edge case worth filing if the workaround doesn't help.

To reply, just mention @dosu.

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