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use arrow::{
array::{Array, AsArray, PrimitiveArray, StringArray},
datatypes::ArrowPrimitiveType,
};
use eyre::ContextCompat;
use crate::ArrowData;
impl From<ArrowData> for arrow::array::ArrayRef {
fn from(value: ArrowData) -> Self {
value.0
}
}
impl From<arrow::array::ArrayRef> for ArrowData {
fn from(value: arrow::array::ArrayRef) -> Self {
Self(value)
}
}
impl TryFrom<&ArrowData> for bool {
type Error = eyre::Report;
fn try_from(value: &ArrowData) -> Result<Self, Self::Error> {
let bool_array = value.as_boolean_opt().context("not a bool array")?;
if bool_array.is_empty() {
eyre::bail!("empty array");
}
if bool_array.len() != 1 {
eyre::bail!("expected length 1");
}
if bool_array.null_count() != 0 {
eyre::bail!("bool array has nulls");
}
Ok(bool_array.value(0))
}
}
impl TryFrom<&ArrowData> for u8 {
type Error = eyre::Report;
fn try_from(value: &ArrowData) -> Result<Self, Self::Error> {
let array = value
.as_primitive_opt::<arrow::datatypes::UInt8Type>()
.context("not a primitive UInt8Type array")?;
extract_single_primitive(array)
}
}
impl TryFrom<&ArrowData> for u16 {
type Error = eyre::Report;
fn try_from(value: &ArrowData) -> Result<Self, Self::Error> {
let array = value
.as_primitive_opt::<arrow::datatypes::UInt16Type>()
.context("not a primitive UInt16Type array")?;
extract_single_primitive(array)
}
}
impl TryFrom<&ArrowData> for u32 {
type Error = eyre::Report;
fn try_from(value: &ArrowData) -> Result<Self, Self::Error> {
let array = value
.as_primitive_opt::<arrow::datatypes::UInt32Type>()
.context("not a primitive UInt32Type array")?;
extract_single_primitive(array)
}
}
impl TryFrom<&ArrowData> for u64 {
type Error = eyre::Report;
fn try_from(value: &ArrowData) -> Result<Self, Self::Error> {
let array = value
.as_primitive_opt::<arrow::datatypes::UInt64Type>()
.context("not a primitive UInt64Type array")?;
extract_single_primitive(array)
}
}
impl TryFrom<&ArrowData> for i8 {
type Error = eyre::Report;
fn try_from(value: &ArrowData) -> Result<Self, Self::Error> {
let array = value
.as_primitive_opt::<arrow::datatypes::Int8Type>()
.context("not a primitive Int8Type array")?;
extract_single_primitive(array)
}
}
impl TryFrom<&ArrowData> for i16 {
type Error = eyre::Report;
fn try_from(value: &ArrowData) -> Result<Self, Self::Error> {
let array = value
.as_primitive_opt::<arrow::datatypes::Int16Type>()
.context("not a primitive Int16Type array")?;
extract_single_primitive(array)
}
}
impl TryFrom<&ArrowData> for i32 {
type Error = eyre::Report;
fn try_from(value: &ArrowData) -> Result<Self, Self::Error> {
let array = value
.as_primitive_opt::<arrow::datatypes::Int32Type>()
.context("not a primitive Int32Type array")?;
extract_single_primitive(array)
}
}
impl TryFrom<&ArrowData> for i64 {
type Error = eyre::Report;
fn try_from(value: &ArrowData) -> Result<Self, Self::Error> {
let array = value
.as_primitive_opt::<arrow::datatypes::Int64Type>()
.context("not a primitive Int64Type array")?;
extract_single_primitive(array)
}
}
impl<'a> TryFrom<&'a ArrowData> for &'a str {
type Error = eyre::Report;
fn try_from(value: &'a ArrowData) -> Result<Self, Self::Error> {
let array: &StringArray = value.as_string_opt().wrap_err("not a string array")?;
if array.is_empty() {
eyre::bail!("empty array");
}
if array.len() != 1 {
eyre::bail!("expected length 1");
}
if array.null_count() != 0 {
eyre::bail!("array has nulls");
}
Ok(array.value(0))
}
}
impl<'a> TryFrom<&'a ArrowData> for &'a [u8] {
type Error = eyre::Report;
fn try_from(value: &'a ArrowData) -> Result<Self, Self::Error> {
let array: &PrimitiveArray<arrow::datatypes::UInt8Type> = value
.as_primitive_opt()
.wrap_err("not a primitive UInt8Type array")?;
if array.null_count() != 0 {
eyre::bail!("array has nulls");
}
Ok(array.values())
}
}
impl<'a> TryFrom<&'a ArrowData> for Vec<u8> {
type Error = eyre::Report;
fn try_from(value: &'a ArrowData) -> Result<Self, Self::Error> {
value.try_into().map(|slice: &'a [u8]| slice.to_vec())
}
}
fn extract_single_primitive<T>(array: &PrimitiveArray<T>) -> Result<T::Native, eyre::Error>
where
T: ArrowPrimitiveType,
{
if array.is_empty() {
eyre::bail!("empty array");
}
if array.len() != 1 {
eyre::bail!("expected length 1");
}
if array.null_count() != 0 {
eyre::bail!("array has nulls");
}
Ok(array.value(0))
}
#[cfg(test)]
mod tests {
use arrow::array::{make_array, PrimitiveArray};
use crate::ArrowData;
#[test]
fn test_u8() {
let array =
make_array(PrimitiveArray::<arrow::datatypes::UInt8Type>::from(vec![42]).into());
let data: ArrowData = array.into();
let value: u8 = (&data).try_into().unwrap();
assert_eq!(value, 42);
}
}
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