GitHub user dosubot[bot] added a comment to the discussion: How to sort time 
series column correctly in Time-Series table ?

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Hi @BNyamkhuu! I'm [Dosu](https://go.dosu.dev/dosubot) and I’m helping the 
superset team.

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Both issues you're describing — D3-formatted columns sorting lexicographically 
and Sparkline columns failing to sort — have been identified and fixed in 
recent PRs:

1. **Column sorting always falling back to the first column** (which affects 
both D3-formatted and Sparkline columns): The root cause was that the 
`sortNumberWithMixedTypes` comparator tried to access a `data-value` prop that 
didn't actually exist in react-table's row model, causing every comparison to 
return `0` (equal) and fall back to the default first-column sort. This was 
fixed in [PR #38579](https://github.com/apache/superset/pull/38579) (merged 
March 19, 2026), which rewrites the sort function to extract the raw numeric 
value directly from each cell's React props — handling both ValueCell and 
SparklineCell types [[1]](https://github.com/apache/superset/pull/38579) 
[[2]](https://github.com/apache/superset/pull/38579).

2. **D3 formatter initialization causing string-based sorting**: A separate 
issue where `setupFormatters` was called asynchronously (after first render), 
which could cause numbers to be treated as plain strings. This was fixed in [PR 
#35529](https://github.com/apache/superset/pull/35529) (merged October 2025) by 
making the formatter setup synchronous 
[[3]](https://github.com/apache/superset/pull/35529).

Since you're running a Docker image from ~4 months ago (likely pre-dating the 
March 2026 fix), **upgrading to a newer Superset build that includes PR 
#38579** should resolve both the D3-format sorting and Sparkline sorting issues 
you're experiencing.

There are also two open PRs that address remaining edge cases:

- [PR #38094](https://github.com/apache/superset/pull/38094) — fixes null 
values being coerced to `0` instead of preserved as `null` 
[[4]](https://github.com/apache/superset/pull/38094)
- [PR #38828](https://github.com/apache/superset/pull/38828) — fixes sorting 
for date-prefixed or complex column keys where the row value lookup can fail 
[[5]](https://github.com/apache/superset/pull/38828)


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GitHub link: 
https://github.com/apache/superset/discussions/38937#discussioncomment-16375648

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