zhangxinyao88 opened a new pull request, #232:
URL: https://github.com/apache/datasketches-rust/pull/232
Part of #212.
## Summary
- implement `Display` for `HllSketch`, `HllUnion`, `CpcSketch`, and
`CpcUnion`
- keep the output summary-only, without raw register or coupon details
- add coverage for empty and populated sketches and update the changelog
Example output:
```text
HLL Sketch Summary:
lg config k : 12
target type : Hll8
current mode : List
lower bound : 0
estimate : 0
upper bound : 0
```
```text
CPC Sketch Summary:
flavor : Empty
lg k : 11
merged : false
lower bound : 0
estimate : 0
upper bound : 0
num coupons : 0
```
## Testing
- `cargo x check`
- `cargo x test`
- `cargo +nightly clippy --tests --all-features --all-targets --workspace --
-D warnings`
- `cargo +nightly fmt --all --check`
- `cargo +nightly doc --package datasketches --all-features --no-deps`
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