Andrew Lamb created ARROW-10390:
-----------------------------------
Summary: [Rust] [Parquet] Regression Can not implement custom
ParquetWriter because `TryClone` is not publically exported
Key: ARROW-10390
URL: https://issues.apache.org/jira/browse/ARROW-10390
Project: Apache Arrow
Issue Type: Bug
Reporter: Andrew Lamb
Assignee: Andrew Lamb
As of this commit
https://github.com/apache/arrow/commit/7155cd5488310c15d864428252ca71dd9ebd3b48
I don't think it is possible for a user of the arrow trait to implement a
custom Parquet writer anymore. Specifically, theParquetWriter trait requires
`TryClone` implemented,
https://github.com/apache/arrow/blob/master/rust/parquet/src/file/writer.rs#L117-L118
{code}
pub trait ParquetWriter: Write + Seek + TryClone {}
impl<T: Write + Seek + TryClone> ParquetWriter for T {}
/// A serialized implementation for Parquet [`FileWriter`].
/// See documentation on file writer for more information.
pub struct SerializedFileWriter<W: ParquetWriter> {
{code}
but `TryClone` is can not be used. It is a `pub` trait:
https://github.com/apache/arrow/blob/master/rust/parquet/src/util/io.rs#L28-L32
{code}
/// TryClone tries to clone the type and should maintain the `Seek` position of
the given
/// instance.
pub trait TryClone: Sized {
/// Clones the type returning a new instance or an error if it's not
possible
/// to clone it.
fn try_clone(&self) -> Result<Self>;
}
{code}
But the module it is (util.io) in is not marked as `pub`:
https://github.com/apache/arrow/blob/master/rust/parquet/src/lib.rs#L39
```
#[macro_use]
mod util;
#[cfg(any(feature = "arrow", test))]
pub mod arrow;
pub mod column;
pub mod compression;
mod encodings;
pub mod file;
pub mod record;
pub mod schema;
{code}
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