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ARROW-11722: [Rust] Improve error message in FFI cast. #9540

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10 changes: 5 additions & 5 deletions rust/arrow/src/ffi.rs
Original file line number Diff line number Diff line change
Expand Up @@ -193,11 +193,11 @@ fn to_datatype(format: &str) -> Result<DataType> {
"ttm" => DataType::Time32(TimeUnit::Millisecond),
"ttu" => DataType::Time64(TimeUnit::Microsecond),
"ttn" => DataType::Time64(TimeUnit::Nanosecond),
_ => {
return Err(ArrowError::CDataInterface(
"The datatype \"{}\" is still not supported in Rust implementation"
.to_string(),
))
dt => {
return Err(ArrowError::CDataInterface(format!(
"The datatype \"{}\" is still not supported in Rust implementation",
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dt
)))
}
})
}
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