gabotechs opened a new issue, #20779:
URL: https://github.com/apache/datafusion/issues/20779
### Describe the bug
`max_distinct_count` in `datafusion/physical-plan/src/joins/utils.rs` panics
with "attempt to subtract with overflow" in the `Precision::Exact` branch (line
725):
```rust
Precision::Exact(count) => {
let count = count - stats.null_count.get_value().unwrap_or(&0); // <--
panic
```
This happens when `num_rows` (Exact) is smaller than `null_count`, which
became possible after #20228 ("Push limit into hash join").
### To Reproduce
```
git clone https://github.com/datafusion-contrib/datafusion-distributed
cd datafusion-distributed
git checkout branch-53
cargo test --test tpcds_plans_test tests::test_tpcds_19 --all-features
```
### Expected behavior
No substraction overflow
### Additional context
_No response_
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