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use std::any::Any;
use std::fmt;
use std::mem;
use super::make_array;
use super::{
array::print_long_array, raw_pointer::RawPtrBox, Array, ArrayData, ArrayRef,
};
use crate::datatypes::{ArrowNativeType, DataType};
use crate::error::ArrowError;
pub struct MapArray {
data: ArrayData,
values: ArrayRef,
value_offsets: RawPtrBox<i32>,
}
impl MapArray {
pub fn keys(&self) -> ArrayRef {
make_array(self.values.data().child_data()[0].clone())
}
pub fn values(&self) -> ArrayRef {
make_array(self.values.data().child_data()[1].clone())
}
pub fn key_type(&self) -> DataType {
self.values.data().child_data()[0].data_type().clone()
}
pub fn value_type(&self) -> DataType {
self.values.data().child_data()[1].data_type().clone()
}
pub unsafe fn value_unchecked(&self, i: usize) -> ArrayRef {
let end = *self.value_offsets().get_unchecked(i + 1);
let start = *self.value_offsets().get_unchecked(i);
self.values
.slice(start.to_usize().unwrap(), (end - start).to_usize().unwrap())
}
pub fn value(&self, i: usize) -> ArrayRef {
let end = self.value_offsets()[i + 1] as usize;
let start = self.value_offsets()[i] as usize;
self.values.slice(start, end - start)
}
#[inline]
pub fn value_offsets(&self) -> &[i32] {
unsafe {
std::slice::from_raw_parts(
self.value_offsets.as_ptr().add(self.data.offset()),
self.len() + 1,
)
}
}
#[inline]
pub fn value_length(&self, i: usize) -> i32 {
let offsets = self.value_offsets();
offsets[i + 1] - offsets[i]
}
}
impl From<ArrayData> for MapArray {
fn from(data: ArrayData) -> Self {
Self::try_new_from_array_data(data)
.expect("Expected infallable creation of MapArray from ArrayData failed")
}
}
impl MapArray {
fn try_new_from_array_data(data: ArrayData) -> Result<Self, ArrowError> {
if data.buffers().len() != 1 {
return Err(ArrowError::InvalidArgumentError(
format!("MapArray data should contain a single buffer only (value offsets), had {}",
data.len())));
}
if data.child_data().len() != 1 {
return Err(ArrowError::InvalidArgumentError(format!(
"MapArray should contain a single child array (values array), had {}",
data.child_data().len()
)));
}
let entries = data.child_data()[0].clone();
if let DataType::Struct(fields) = entries.data_type() {
if fields.len() != 2 {
return Err(ArrowError::InvalidArgumentError(format!(
"MapArray should contain a struct array with 2 fields, have {} fields",
fields.len()
)));
}
} else {
return Err(ArrowError::InvalidArgumentError(format!(
"MapArray should contain a struct array child, found {:?}",
entries.data_type()
)));
}
let values = make_array(entries);
let value_offsets = data.buffers()[0].as_ptr();
let value_offsets = unsafe { RawPtrBox::<i32>::new(value_offsets) };
unsafe {
if (*value_offsets.as_ptr().offset(0)) != 0 {
return Err(ArrowError::InvalidArgumentError(String::from(
"offsets do not start at zero",
)));
}
}
Ok(Self {
data,
values,
value_offsets,
})
}
}
impl Array for MapArray {
fn as_any(&self) -> &dyn Any {
self
}
fn data(&self) -> &ArrayData {
&self.data
}
fn get_buffer_memory_size(&self) -> usize {
self.data.get_buffer_memory_size()
}
fn get_array_memory_size(&self) -> usize {
self.data.get_array_memory_size() + mem::size_of_val(self)
}
}
impl fmt::Debug for MapArray {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "MapArray\n[\n")?;
print_long_array(self, f, |array, index, f| {
fmt::Debug::fmt(&array.value(index), f)
})?;
write!(f, "]")
}
}
#[cfg(test)]
mod tests {
use std::sync::Arc;
use crate::{
array::ArrayData,
array::{Int32Array, StructArray, UInt32Array},
buffer::Buffer,
datatypes::Field,
datatypes::ToByteSlice,
};
use super::*;
fn create_from_buffers() -> MapArray {
let keys_data = ArrayData::builder(DataType::Int32)
.len(8)
.add_buffer(Buffer::from(&[0, 1, 2, 3, 4, 5, 6, 7].to_byte_slice()))
.build()
.unwrap();
let values_data = ArrayData::builder(DataType::UInt32)
.len(8)
.add_buffer(Buffer::from(
&[0u32, 10, 20, 30, 40, 50, 60, 70].to_byte_slice(),
))
.build()
.unwrap();
let entry_offsets = Buffer::from(&[0, 3, 6, 8].to_byte_slice());
let keys = Field::new("keys", DataType::Int32, false);
let values = Field::new("values", DataType::UInt32, false);
let entry_struct = StructArray::from(vec![
(keys, make_array(keys_data)),
(values, make_array(values_data)),
]);
let map_data_type = DataType::Map(
Box::new(Field::new(
"entries",
entry_struct.data_type().clone(),
true,
)),
false,
);
let map_data = ArrayData::builder(map_data_type)
.len(3)
.add_buffer(entry_offsets)
.add_child_data(entry_struct.data().clone())
.build()
.unwrap();
MapArray::from(map_data)
}
#[test]
fn test_map_array() {
let key_data = ArrayData::builder(DataType::Int32)
.len(8)
.add_buffer(Buffer::from(&[0, 1, 2, 3, 4, 5, 6, 7].to_byte_slice()))
.build()
.unwrap();
let value_data = ArrayData::builder(DataType::UInt32)
.len(8)
.add_buffer(Buffer::from(
&[0u32, 10, 20, 0, 40, 0, 60, 70].to_byte_slice(),
))
.null_bit_buffer(Buffer::from(&[0b11010110]))
.build()
.unwrap();
let entry_offsets = Buffer::from(&[0, 3, 6, 8].to_byte_slice());
let keys_field = Field::new("keys", DataType::Int32, false);
let values_field = Field::new("values", DataType::UInt32, true);
let entry_struct = StructArray::from(vec![
(keys_field.clone(), make_array(key_data)),
(values_field.clone(), make_array(value_data.clone())),
]);
let map_data_type = DataType::Map(
Box::new(Field::new(
"entries",
entry_struct.data_type().clone(),
true,
)),
false,
);
let map_data = ArrayData::builder(map_data_type)
.len(3)
.add_buffer(entry_offsets)
.add_child_data(entry_struct.data().clone())
.build()
.unwrap();
let map_array = MapArray::from(map_data);
let values = map_array.values();
assert_eq!(&value_data, values.data());
assert_eq!(DataType::UInt32, map_array.value_type());
assert_eq!(3, map_array.len());
assert_eq!(0, map_array.null_count());
assert_eq!(6, map_array.value_offsets()[2]);
assert_eq!(2, map_array.value_length(2));
let key_array = Arc::new(Int32Array::from(vec![0, 1, 2])) as ArrayRef;
let value_array =
Arc::new(UInt32Array::from(vec![None, Some(10u32), Some(20)])) as ArrayRef;
let struct_array = StructArray::from(vec![
(keys_field.clone(), key_array),
(values_field.clone(), value_array),
]);
assert_eq!(
struct_array,
StructArray::from(map_array.value(0).data().clone())
);
assert_eq!(
&struct_array,
unsafe { map_array.value_unchecked(0) }
.as_any()
.downcast_ref::<StructArray>()
.unwrap()
);
for i in 0..3 {
assert!(map_array.is_valid(i));
assert!(!map_array.is_null(i));
}
let map_data = ArrayData::builder(map_array.data_type().clone())
.len(2)
.offset(1)
.add_buffer(map_array.data().buffers()[0].clone())
.add_child_data(map_array.data().child_data()[0].clone())
.build()
.unwrap();
let map_array = MapArray::from(map_data);
let values = map_array.values();
assert_eq!(&value_data, values.data());
assert_eq!(DataType::UInt32, map_array.value_type());
assert_eq!(2, map_array.len());
assert_eq!(0, map_array.null_count());
assert_eq!(6, map_array.value_offsets()[1]);
assert_eq!(2, map_array.value_length(1));
let key_array = Arc::new(Int32Array::from(vec![3, 4, 5])) as ArrayRef;
let value_array =
Arc::new(UInt32Array::from(vec![None, Some(40), None])) as ArrayRef;
let struct_array =
StructArray::from(vec![(keys_field, key_array), (values_field, value_array)]);
assert_eq!(
&struct_array,
map_array
.value(0)
.as_any()
.downcast_ref::<StructArray>()
.unwrap()
);
assert_eq!(
&struct_array,
unsafe { map_array.value_unchecked(0) }
.as_any()
.downcast_ref::<StructArray>()
.unwrap()
);
}
#[test]
#[ignore = "Test fails because slice of <list<struct>> is still buggy"]
fn test_map_array_slice() {
let map_array = create_from_buffers();
let sliced_array = map_array.slice(1, 2);
assert_eq!(2, sliced_array.len());
assert_eq!(1, sliced_array.offset());
let sliced_array_data = sliced_array.data();
for array_data in sliced_array_data.child_data() {
assert_eq!(array_data.offset(), 1);
}
let sliced_map_array = sliced_array.as_any().downcast_ref::<MapArray>().unwrap();
assert_eq!(3, sliced_map_array.value_offsets()[0]);
assert_eq!(3, sliced_map_array.value_length(0));
assert_eq!(6, sliced_map_array.value_offsets()[1]);
assert_eq!(2, sliced_map_array.value_length(1));
let keys_data = ArrayData::builder(DataType::Int32)
.len(5)
.add_buffer(Buffer::from(&[3, 4, 5, 6, 7].to_byte_slice()))
.build()
.unwrap();
let values_data = ArrayData::builder(DataType::UInt32)
.len(5)
.add_buffer(Buffer::from(&[30u32, 40, 50, 60, 70].to_byte_slice()))
.build()
.unwrap();
let entry_offsets = Buffer::from(&[0, 3, 5].to_byte_slice());
let keys = Field::new("keys", DataType::Int32, false);
let values = Field::new("values", DataType::UInt32, false);
let entry_struct = StructArray::from(vec![
(keys, make_array(keys_data)),
(values, make_array(values_data)),
]);
let map_data_type = DataType::Map(
Box::new(Field::new(
"entries",
entry_struct.data_type().clone(),
true,
)),
false,
);
let expected_map_data = ArrayData::builder(map_data_type)
.len(2)
.add_buffer(entry_offsets)
.add_child_data(entry_struct.data().clone())
.build()
.unwrap();
let expected_map_array = MapArray::from(expected_map_data);
assert_eq!(&expected_map_array, sliced_map_array)
}
#[test]
#[should_panic(expected = "index out of bounds: the len is ")]
fn test_map_array_index_out_of_bound() {
let map_array = create_from_buffers();
map_array.value(map_array.len());
}
}