jorgecarleitao commented on a change in pull request #453:
URL: https://github.com/apache/arrow-rs/pull/453#discussion_r654790603
##########
File path: arrow/src/ffi.rs
##########
@@ -271,12 +271,54 @@ fn to_field(schema: &FFI_ArrowSchema) -> Result<Field> {
.collect::<Result<Vec<_>>>()?;
DataType::Struct(children)
}
- other => {
- return Err(ArrowError::CDataInterface(format!(
- "The datatype \"{:?}\" is still not supported in Rust
implementation",
- other
- )))
- }
+ other => match other
+ .split(|c| c == ':' || c == ',')
+ .collect::<Vec<&str>>()
+ .as_slice()
+ {
+ ["d", precision, scale] => {
+ let parsed_precision = precision.parse::<usize>().map_err(|_| {
+ ArrowError::CDataInterface(format!(
+ "The decimal \"{:?}\" is not supported in Rust
implementation",
+ other
+ ))
+ })?;
+ let parsed_scale = scale.parse::<usize>().map_err(|_| {
+ ArrowError::CDataInterface(format!(
+ "The decimal \"{:?}\" is not supported in Rust
implementation",
+ other
+ ))
+ })?;
+ DataType::Decimal(parsed_precision, parsed_scale)
+ }
+ ["d", precision, scale, bits] => {
+ if *bits != "128" {
+ return Err(ArrowError::CDataInterface(format!(
+ "The decimal \"{:?}\" is still not supported in Rust
implementation",
+ other
+ )));
+ }
+ let parsed_precision = precision.parse::<usize>().map_err(|_| {
+ ArrowError::CDataInterface(format!(
+ "The decimal \"{:?}\" is not supported in Rust
implementation",
Review comment:
This happens when the type is incorrect, right? Shouldn't we return a
different message here? Something like "The decimal type requires an integer
precision"? Same for the scale.
##########
File path: arrow/src/ffi.rs
##########
@@ -271,12 +271,54 @@ fn to_field(schema: &FFI_ArrowSchema) -> Result<Field> {
.collect::<Result<Vec<_>>>()?;
DataType::Struct(children)
}
- other => {
- return Err(ArrowError::CDataInterface(format!(
- "The datatype \"{:?}\" is still not supported in Rust
implementation",
- other
- )))
- }
+ other => match other
+ .split(|c| c == ':' || c == ',')
Review comment:
It is a cool ideal, but I believe that this also accepts something like
`d:1:2`, which is not in spec.
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