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Posted to notifications@superset.apache.org by "mandar0324 (via GitHub)" <gi...@apache.org> on 2026/02/18 06:51:00 UTC

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

mandar0324 opened a new issue, #38037:
URL: https://github.com/apache/superset/issues/38037

### 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](https://github.com/user-attachments/files/25383785/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

### Browser

Chrome

### Additional context

_No response_

### Checklist

- [x] I have searched Superset docs and Slack and didn't find a solution to my problem.
- [x] I have searched the GitHub issue tracker and didn't find a similar bug report.
- [x] 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.

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Re: [I] ECharts Bar Chart renders only currency symbol ($) when Show Value is enabled with stacked bars [superset]

Posted by "dosubot[bot] (via GitHub)" <gi...@apache.org>.

dosubot[bot] commented on issue #38037:
URL: https://github.com/apache/superset/issues/38037#issuecomment-3919064445

   <!-- Greeting -->
   Hi @mandar0324! I'm [Dosu](https://go.dosu.dev/dosubot) and I’m helping the superset team.
   
   <!-- Answer -->
   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](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/packages/superset-ui-core/src/number-format/factories/createSmartNumberFormatter.ts#L24-L47) 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](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/plugin-chart-echarts/src/utils/series.ts#L58-L93) 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](https://github.com/apache/superset/pull/37039), [#36989](https://github.com/apache/superset/pull/36989)) for related currency formatting issues, so this may be a new edge case worth filing if the workaround doesn't help.
   
   
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   [![Chat with Dosu](https://dosu.dev/dosu-chat-badge.svg)](https://app.dosu.dev/a28d3c7e-a9d3-459e-9fb6-3a6f9ff4f357/ask?utm_source=github)&nbsp;[![Open in Cursor](https://dosu.dev/dosu-in-cursor.svg)](https://cursor.com/link/prompt?text=Thanks%20for%20the%20detailed%20bug%20report%21%20I%20looked%20into%20the%20code%20and%20found%20a%20likely%20root%20cause.%0A%0A%2A%2AThe%20issue%3A%2A%2A%20When%20your%20near-zero%20negative%20values%20%28e.g.%2C%20-1%20to%20-5%29%20are%20formatted%20alongside%20a%20large%20outlier%20%28-4%2C000%2C000%29%2C%20Superset%20uses%20the%20%5BSMART_NUMBER%20formatter%5D%28https%3A//github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/packages/superset-ui-core/src/number-format/factories/createSmartNumberFormatter.ts%23L24-L47%29%20which%20applies%20SI%20notation.%20For%20very%20small%20values%20relative%20to%20the%20scale%2C%20this%20can%20produce%20strings%20like%20%60%24-1%C2%B5%60%20or%20%60%24-100n%60%20where%20
 the%20micro%20%28%C2%B5%29%20or%20nano%20%28n%29%20symbols%20may%20not%20render%20correctly%20in%20the%20ECharts%20label%2C%20leaving%20only%20the%20%60%24%60%20visible.%0A%0AAdditionally%2C%20the%20%5Bstacked%20bar%20threshold%20logic%5D%28https%3A//github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/plugin-chart-echarts/src/utils/series.ts%23L58-L93%29%20calculates%20percentage%20thresholds%20to%20filter%20which%20values%20display%20labels.%20With%20a%20massive%20outlier%20dominating%20the%20scale%2C%20your%20near-zero%20values%20become%20an%20extremely%20small%20percentage%2C%20potentially%20triggering%20edge%20cases.%0A%0A%2A%2AWorkaround%3A%2A%2A%20Try%20overriding%20the%20default%20number%20format%20with%20an%20explicit%20d3-format%20string%20%28e.g.%2C%20%60%24%2C.0f%60%20or%20%60%24%2C.2f%60%29%20instead%20of%20relying%20on%20the%20adaptive%20SMART_NUMBER%20format.%20This%20should%20prevent%20SI%20notation%20from%20being%20used%
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Re: [I] ECharts Bar Chart renders only currency symbol ($) when Show Value is enabled with stacked bars [superset]

Posted by "rusackas (via GitHub)" <gi...@apache.org>.

rusackas closed issue #38037: ECharts Bar Chart renders only currency symbol ($) when Show Value is enabled with stacked bars
URL: https://github.com/apache/superset/issues/38037


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Re: [I] ECharts Bar Chart renders only currency symbol ($) when Show Value is enabled with stacked bars [superset]

Posted by "rusackas (via GitHub)" <gi...@apache.org>.

rusackas commented on issue #38037:
URL: https://github.com/apache/superset/issues/38037#issuecomment-5802447813

   Thanks @mandar0324. Looks like #38695 fixed the bare `$` labels on master, and #44469 (just merged) cleaned up the colliding labels in your second screenshot. Closing this out, but holler if you still see it on a recent build and I'll reopen.


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Re: [I] ECharts Bar Chart renders only currency symbol ($) when Show Value is enabled with stacked bars [superset]

Posted by "sadpandajoe (via GitHub)" <gi...@apache.org>.

sadpandajoe commented on issue #38037:
URL: https://github.com/apache/superset/issues/38037#issuecomment-5754265882

   The originally reported symptom here — value labels on negative horizontal stacked segments clipping off-canvas down to a bare currency symbol — is already fixed on `master`, as a side effect of #38695 (which changed the negative-horizontal label anchor from `insideLeft` to `left`, so the label no longer draws off the edge of the chart).
   
   Investigating this also surfaced a related but distinct, still-live defect: on stacked bars where several segments are much smaller in magnitude than another segment/outlier in the same series, their (non-zero) value labels can collide and overlap into illegible garbled text — this matches the second screenshot on this issue and reproduces on current `master`. That's now tracked separately in #44466, since it has a different root cause and doesn't depend on the horizontal-clipping mechanism above.
   
   (Found via automated investigation — Agor/Ultraset.)
   


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