HaoYang670 opened a new issue, #4165:
URL: https://github.com/apache/arrow-datafusion/issues/4165
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Currently, in the `type_coercion` mod, we have some pub functions returning
`Result`, such as
```rust
pub fn coerce_types(
lhs_type: &DataType,
op: &Operator,
rhs_type: &DataType,
) -> Result<DataType> {
```
, and others returning `Option`:
```rust
pub fn comparison_coercion(lhs_type: &DataType, rhs_type: &DataType) ->
Option<DataType> {
```
We should let all of them to return `Result` so that we can find the error
as early as possible. Currently, we do the conversion from `None` to `Error` in
the downstream code:
```rust
let case_when_coerce_type =
get_coerce_type_for_case_when(&then_types, &else_type);
match case_when_coerce_type {
None => Err(DataFusionError::Internal(format!(
"Failed to coerce then ({:?}) and else ({:?}) to
common types in CASE WHEN expression",
then_types, else_type
))),
```
, which should be avoided.
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