alamb commented on a change in pull request #8400:
URL: https://github.com/apache/arrow/pull/8400#discussion_r501795062
##########
File path: rust/datafusion/src/logical_plan/mod.rs
##########
@@ -323,12 +324,13 @@ impl Expr {
///
/// # Errors
///
- /// This function errors when it is impossible to cast the expression to
the target [arrow::datatypes::DataType].
+ /// This function errors when it is impossible to cast the
+ /// expression to the target [arrow::datatypes::DataType].
pub fn cast_to(&self, cast_to_type: &DataType, schema: &Schema) ->
Result<Expr> {
let this_type = self.get_type(schema)?;
if this_type == *cast_to_type {
Ok(self.clone())
- } else if can_coerce_from(cast_to_type, &this_type) {
+ } else if can_cast_types(&this_type, cast_to_type) {
Review comment:
the idea is to use a common `can_cast_types` function to detect valid
casts at plan time, and make `can_cast_types` consistent with the arrow cast
kernel
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