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https://issues.apache.org/jira/browse/AVRO-3331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17485797#comment-17485797
]
Thomas Schilling commented on AVRO-3331:
----------------------------------------
Your `try_from` doesn't compile for me:
{code}
use avro_rs::Decimal;
use std::convert::TryFrom;
fn main() {
let d = Decimal::from(vec![1, 24]);
println!("{:?}", d);
let bytes = <Vec<u8>>::try_from(d);
println!("{:?}", bytes);
}
{code}
With avro-rs 0.13 and rust 1.58.1 I get:
{code}
error[E0277]: the trait bound `Vec<u8>: From<avro_rs::Decimal>` is not satisfied
--> src/main.rs:8:17
|
8 | let bytes = <Vec<u8>>::try_from(d);
| ^^^^^^^^^^^^^^^^^^^ the trait `From<avro_rs::Decimal>` is
not implemented for `Vec<u8>`
|
= help: the following implementations were found:
<Vec<T, A> as From<Box<[T], A>>>
<Vec<T, A> as From<VecDeque<T, A>>>
<Vec<T> as From<&[T]>>
<Vec<T> as From<&mut [T]>>
and 6 others
= note: required because of the requirements on the impl of `Into<Vec<u8>>`
for `avro_rs::Decimal`
= note: required because of the requirements on the impl of
`TryFrom<avro_rs::Decimal>` for `Vec<u8>`
error[E0277]: the trait bound `Vec<u8>: From<avro_rs::Decimal>` is not satisfied
--> src/main.rs:8:17
|
8 | let bytes = <Vec<u8>>::try_from(d);
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `From<avro_rs::Decimal>`
is not implemented for `Vec<u8>`
|
= help: the following implementations were found:
<Vec<T, A> as From<Box<[T], A>>>
<Vec<T, A> as From<VecDeque<T, A>>>
<Vec<T> as From<&[T]>>
<Vec<T> as From<&mut [T]>>
and 6 others
= note: required because of the requirements on the impl of `Into<Vec<u8>>`
for `avro_rs::Decimal`
= note: required because of the requirements on the impl of
`TryFrom<avro_rs::Decimal>` for `Vec<u8>`
For more information about this error, try `rustc --explain E0277`.
{code}
> Rust: Cannot extract Decimal value
> ----------------------------------
>
> Key: AVRO-3331
> URL: https://issues.apache.org/jira/browse/AVRO-3331
> Project: Apache Avro
> Issue Type: Bug
> Components: rust
> Reporter: Thomas Schilling
> Assignee: Martin Tzvetanov Grigorov
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> The [Decimal|https://docs.rs/avro-rs/latest/avro_rs/struct.Decimal.html] type
> (as of 0.13) doesn't have any methods or trait implementations that allow
> users to extract the value. The only workaround I could think of would be to
> parse the output of the `Debug` implementation. But that's clearly very
> inefficient and fragile.
> The (unreleased?) version 0.14 also seems to have the same issue
> ([source|https://github.com/apache/avro/blob/master/lang/rust/src/decimal.rs]).
> It might just be enough to make the {{to_vec }}method public and specify how
> to interpret the result vector.
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