Rachelint commented on PR #11827:
URL: https://github.com/apache/datafusion/pull/11827#issuecomment-2346985605
> > I am trying to find the reason.
>
> It is probably because there are 17M groups which each is holding multiple
aggregates each with non trivial state 🤔
Yes... I found state is much larger than the simple accumulators(e.g.
`count`, `sum`, `average`).
For example, the digest for `approx_percentile_cont`:
```
pub struct TDigest {
centroids: Vec<Centroid>,
max_size: usize,
sum: f64,
count: u64,
max: f64,
min: f64,
}
```
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