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use std::convert::TryFrom;
use crate::{
error::{ArrowError, Result},
ffi,
};
use super::ArrayData;
use crate::datatypes::DataType;
use crate::ffi::ArrowArray;
impl TryFrom<ffi::ArrowArray> for ArrayData {
type Error = ArrowError;
fn try_from(value: ffi::ArrowArray) -> Result<Self> {
let child_data = value.children()?;
let child_type = if !child_data.is_empty() {
Some(child_data[0].data_type().clone())
} else {
None
};
let data_type = value.data_type(child_type)?;
let len = value.len();
let offset = value.offset();
let null_count = value.null_count();
let buffers = value.buffers()?;
let null_bit_buffer = value.null_bit_buffer();
Ok(ArrayData::new(
data_type,
len,
Some(null_count),
null_bit_buffer,
offset,
buffers,
child_data,
))
}
}
impl TryFrom<ArrayData> for ffi::ArrowArray {
type Error = ArrowError;
fn try_from(value: ArrayData) -> Result<Self> {
let nullable = match value.data_type() {
DataType::List(field) => field.is_nullable(),
DataType::LargeList(field) => field.is_nullable(),
_ => false,
};
let len = value.len();
let offset = value.offset() as usize;
let null_count = value.null_count();
let buffers = value.buffers().to_vec();
let null_buffer = value.null_buffer().cloned();
let child_data = value
.child_data()
.iter()
.map(|arr| {
let len = arr.len();
let offset = arr.offset() as usize;
let null_count = arr.null_count();
let buffers = arr.buffers().to_vec();
let null_buffer = arr.null_buffer().cloned();
unsafe {
ArrowArray::try_new(
arr.data_type(),
len,
null_count,
null_buffer,
offset,
buffers,
vec![],
nullable,
)
.expect("infallible")
}
})
.collect::<Vec<_>>();
unsafe {
ffi::ArrowArray::try_new(
value.data_type(),
len,
null_count,
null_buffer,
offset,
buffers,
child_data,
nullable,
)
}
}
}
#[cfg(test)]
mod tests {
use crate::error::Result;
use crate::{
array::{Array, ArrayData, Int64Array, UInt32Array, UInt64Array},
ffi::ArrowArray,
};
use std::convert::TryFrom;
fn test_round_trip(expected: &ArrayData) -> Result<()> {
let d1 = ArrowArray::try_from(expected.clone())?;
let (array, schema) = ArrowArray::into_raw(d1);
let d1 = unsafe { ArrowArray::try_from_raw(array, schema) }?;
let result = &ArrayData::try_from(d1)?;
assert_eq!(result, expected);
Ok(())
}
#[test]
fn test_u32() -> Result<()> {
let array = UInt32Array::from(vec![Some(2), None, Some(1), None]);
let data = array.data();
test_round_trip(data)
}
#[test]
fn test_u64() -> Result<()> {
let array = UInt64Array::from(vec![Some(2), None, Some(1), None]);
let data = array.data();
test_round_trip(data)
}
#[test]
fn test_i64() -> Result<()> {
let array = Int64Array::from(vec![Some(2), None, Some(1), None]);
let data = array.data();
test_round_trip(data)
}
}