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polars: add binary type support (#13830)

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# Description
This adds support for reading and writing binary types in the polars
commands.

The `BinaryOffset` type can be read into a Nushell native `Value` type
no problem, but unfortunately this is a lossy conversion, as there's
no Nushell-native semantic equivalent to the fixed size binary type
in Arrow.

# User-Facing Changes

`polars open` and `polars save` now work with binary types.
This commit is contained in:
Skyler Hawthorne 2024-09-23 07:28:41 -04:00 committed by GitHub
parent cd0d0364ec
commit 5fa9d76500
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GPG Key ID: B5690EEEBB952194
1 changed files with 37 additions and 2 deletions
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39
crates/nu_plugin_polars/src/dataframe/values/nu_dataframe/conversion.rs
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@ -12,8 +12,8 @@ use polars::prelude::{
DataFrame, DataType, DatetimeChunked, Float32Type, Float64Type, Int16Type, Int32Type,
Int64Type, Int8Type, IntoSeries, ListBooleanChunkedBuilder, ListBuilderTrait,
ListPrimitiveChunkedBuilder, ListStringChunkedBuilder, ListType, NamedFrom, NewChunkedArray,
ObjectType, Schema, Series, StructChunked, TemporalMethods, TimeUnit, UInt16Type, UInt32Type,
UInt64Type, UInt8Type,
ObjectType, PolarsError, Schema, Series, StructChunked, TemporalMethods, TimeUnit, UInt16Type,
UInt32Type, UInt64Type, UInt8Type,
};
use nu_protocol::{Record, ShellError, Span, Value};
@ -237,6 +237,7 @@ pub fn insert_value(
| (Value::Bool { .. }, Value::Bool { .. })
| (Value::Date { .. }, Value::Date { .. })
| (Value::Filesize { .. }, Value::Filesize { .. })
| (Value::Binary { .. }, Value::Binary { .. })
| (Value::Duration { .. }, Value::Duration { .. }) => col_val.values.push(value),
(_, Value::Nothing { .. }) => col_val.values.push(value),
(Value::List { .. }, _) => {
@ -261,6 +262,7 @@ fn value_to_data_type(value: &Value) -> DataType {
Value::Date { .. } => DataType::Date,
Value::Duration { .. } => DataType::Duration(TimeUnit::Nanoseconds),
Value::Filesize { .. } => DataType::Int64,
Value::Binary { .. } => DataType::Binary,
Value::List { vals, .. } => {
// We need to determined the type inside of the list.
// Since Value::List does not have any kind of
@ -404,6 +406,11 @@ fn typed_column_to_series(name: &str, column: TypedColumn) -> Result<Series, She
.collect();
Ok(Series::new(name, series_values?))
}
DataType::Binary | DataType::BinaryOffset => {
let series_values: Result<Vec<_>, _> =
column.values.iter().map(|v| v.coerce_binary()).collect();
Ok(Series::new(name, series_values?))
}
DataType::Object(_, _) => value_to_series(name, &column.values),
DataType::Duration(time_unit) => {
let series_values: Result<Vec<_>, _> = column
@ -965,6 +972,34 @@ fn series_to_values(
Ok(values)
}
t @ (DataType::Binary | DataType::BinaryOffset) => {
let make_err = |e: PolarsError| ShellError::GenericError {
error: "Error casting column to binary".into(),
msg: "".into(),
span: None,
help: Some(e.to_string()),
inner: vec![],
};
let it = match t {
DataType::Binary => series.binary().map_err(make_err)?.into_iter(),
DataType::BinaryOffset => series.binary_offset().map_err(make_err)?.into_iter(),
_ => unreachable!(),
};
let values = if let (Some(size), Some(from_row)) = (maybe_size, maybe_from_row) {
Either::Left(it.skip(from_row).take(size))
} else {
Either::Right(it)
}
.map(|v| match v {
Some(b) => Value::binary(b, span),
None => Value::nothing(span),
})
.collect::<Vec<Value>>();
Ok(values)
}
DataType::Object(x, _) => {
let casted = series
.as_any()