liukun4515 commented on code in PR #1922:
URL: https://github.com/apache/arrow-rs/pull/1922#discussion_r904459539
##########
arrow/src/compute/kernels/cast.rs:
##########
@@ -72,9 +72,9 @@ pub fn can_cast_types(from_type: &DataType, to_type:
&DataType) -> bool {
// cast one decimal type to another decimal type
(Decimal(_, _), Decimal(_, _)) => true,
// signed numeric to decimal
- (Int8 | Int16 | Int32 | Int64 | Float32 | Float64, Decimal(_, _)) |
+ (Null|Int8 | Int16 | Int32 | Int64 | Float32 | Float64, Decimal(_, _))
|
// decimal to signed numeric
- (Decimal(_, _), Int8 | Int16 | Int32 | Int64 | Float32 | Float64)
+ (Decimal(_, _), Null| Int8 | Int16 | Int32 | Int64 | Float32 | Float64)
Review Comment:
I think we can convert Null Data type to other data type, and can't convert
other data type to Null Data type.
```
Null can be converted to the INT32(Some(None))
INT32(Some(None) can't be convert to the Null
```
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