Jefffrey opened a new issue, #5828:
URL: https://github.com/apache/arrow-datafusion/issues/5828
### Describe the bug
Given case expression in following form:
```sql
CASE
WHEN x1 THEN y1
WHEN x2 THEN y2
ELSE y3
END
```
Then all `xN` (`x1`, `x2`) should be boolean expressions and should be
coerced to a boolean type if not, otherwise throw an error without causing a
panic.
### To Reproduce
On latest main:
```bash
jeffrey:~/Code/arrow-datafusion/datafusion-cli$ cargo run
Finished dev [unoptimized + debuginfo] target(s) in 0.30s
Running
`/media/jeffrey/1tb_860evo_ssd/.cargo_target_cache/debug/datafusion-cli`
DataFusion CLI v21.0.0
❯ select CASE WHEN 1 THEN null ELSE 10 END as col;
thread 'main' panicked at 'WHEN expression did not return a BooleanArray:
Internal("could not cast value to
arrow_array::array::boolean_array::BooleanArray")',
/home/jeffrey/Code/arrow-datafusion/datafusion/physical-expr/src/expressions/case.rs:199:18
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
jeffrey:~/Code/arrow-datafusion/datafusion-cli$
```
### Expected behavior
Should either succeed, or throw error without panic
### Additional context
Will be fixed by https://github.com/apache/arrow-datafusion/pull/5820
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