neilconway opened a new issue, #22699:
URL: https://github.com/apache/datafusion/issues/22699
### Describe the bug
```rust
// the result size is two times a*b because you have the columns of
both left and right
let total_byte_size = left_stats
.total_byte_size
.multiply(&right_stats.total_byte_size)
.multiply(&Precision::Exact(2));
```
This formula is wrong: we're multiplying two byte-size values together,
which doesn't make sense. The right formula is `(left_rows * right_row_count) +
(right_rows * left_row_count)`.
### To Reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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