alamb commented on code in PR #1922:
URL: https://github.com/apache/arrow-rs/pull/1922#discussion_r903726625
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arrow/src/compute/kernels/cast.rs:
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@@ -4312,6 +4314,24 @@ mod tests {
assert_eq!(array_to_strings(&cast_array), expected);
}
+ #[test]
+ fn test_cast_null_array_to_decimal_array() {
+ let data_type = DataType::Decimal(12, 4);
+ let array = new_null_array(&DataType::Null, 4);
+ assert_eq!(array.data_type(), &DataType::Null);
+ let cast_array = cast(&array, &data_type).expect("cast failed");
+ assert_eq!(cast_array.data_type(), &data_type);
+ for i in 0..4 {
+ assert!(cast_array.is_null(i));
+ }
+
+ // Now: can't convert decimal to NULL type
+ let array = new_null_array(&data_type, 4);
Review Comment:
Why not support casting `Decimal` to `Null`? If we don't add support in this
PR can / should file a ticket to add it in a follow on I think
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