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mod.rs
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mod.rs
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use std::{collections::HashMap, sync::Arc};
use crate::{
array::{display::get_value_display, display_fmt, new_empty_array, new_null_array, Array},
bitmap::Bitmap,
buffer::Buffer,
datatypes::{DataType, Field},
scalar::{new_scalar, Scalar},
};
mod ffi;
mod iterator;
type FieldEntry = (usize, Arc<dyn Array>);
/// [`UnionArray`] represents an array whose each slot can contain different values.
///
// How to read a value at slot i:
// ```
// let index = self.types()[i] as usize;
// let field = self.fields()[index];
// let offset = self.offsets().map(|x| x[index]).unwrap_or(i);
// let field = field.as_any().downcast to correct type;
// let value = field.value(offset);
// ```
#[derive(Debug, Clone)]
pub struct UnionArray {
types: Buffer<i8>,
// None represents when there is no typeid
fields_hash: Option<HashMap<i8, FieldEntry>>,
fields: Vec<Arc<dyn Array>>,
offsets: Option<Buffer<i32>>,
data_type: DataType,
offset: usize,
}
impl UnionArray {
pub fn new_null(data_type: DataType, length: usize) -> Self {
if let DataType::Union(f, _, is_sparse) = &data_type {
let fields = f
.iter()
.map(|x| new_null_array(x.data_type().clone(), length).into())
.collect();
let offsets = if *is_sparse {
None
} else {
Some((0..length as i32).collect::<Buffer<i32>>())
};
// all from the same field
let types = Buffer::new_zeroed(length);
Self::from_data(data_type, types, fields, offsets)
} else {
panic!("Union struct must be created with the corresponding Union DataType")
}
}
pub fn new_empty(data_type: DataType) -> Self {
if let DataType::Union(f, _, is_sparse) = &data_type {
let fields = f
.iter()
.map(|x| new_empty_array(x.data_type().clone()).into())
.collect();
let offsets = if *is_sparse {
None
} else {
Some(Buffer::new())
};
Self {
data_type,
fields_hash: None,
fields,
offsets,
types: Buffer::new(),
offset: 0,
}
} else {
panic!("Union struct must be created with the corresponding Union DataType")
}
}
pub fn from_data(
data_type: DataType,
types: Buffer<i8>,
fields: Vec<Arc<dyn Array>>,
offsets: Option<Buffer<i32>>,
) -> Self {
let (f, ids, is_sparse) = Self::get_all(&data_type);
if f.len() != fields.len() {
panic!("The number of `fields` must equal the number of fields in the Union DataType")
};
let same_data_types = f
.iter()
.zip(fields.iter())
.all(|(f, array)| f.data_type() == array.data_type());
if !same_data_types {
panic!("All fields' datatype in the union must equal the datatypes on the fields.")
}
if offsets.is_none() != is_sparse {
panic!("Sparsness flag must equal to noness of offsets in UnionArray")
}
let fields_hash = ids.as_ref().map(|ids| {
ids.iter()
.map(|x| *x as i8)
.enumerate()
.zip(fields.iter().cloned())
.map(|((i, type_), field)| (type_, (i, field)))
.collect()
});
// not validated:
// * `offsets` is valid
// * max id < fields.len()
Self {
data_type,
fields_hash,
fields,
offsets,
types,
offset: 0,
}
}
pub fn offsets(&self) -> &Option<Buffer<i32>> {
&self.offsets
}
pub fn fields(&self) -> &Vec<Arc<dyn Array>> {
&self.fields
}
pub fn types(&self) -> &Buffer<i8> {
&self.types
}
#[inline]
fn field(&self, type_: i8) -> &Arc<dyn Array> {
self.fields_hash
.as_ref()
.map(|x| &x[&type_].1)
.unwrap_or_else(|| &self.fields[type_ as usize])
}
#[inline]
fn field_slot(&self, index: usize) -> usize {
self.offsets()
.as_ref()
.map(|x| x[index] as usize)
.unwrap_or(index)
}
/// Returns the index and slot of the field to select from `self.fields`.
pub fn index(&self, index: usize) -> (usize, usize) {
let type_ = self.types()[index];
let field_index = self
.fields_hash
.as_ref()
.map(|x| x[&type_].0)
.unwrap_or_else(|| type_ as usize);
let index = self.field_slot(index);
(field_index, index)
}
/// Returns the slot `index` as a [`Scalar`].
pub fn value(&self, index: usize) -> Box<dyn Scalar> {
let type_ = self.types()[index];
let field = self.field(type_);
let index = self.field_slot(index);
new_scalar(field.as_ref(), index)
}
/// Returns a slice of this [`UnionArray`].
/// # Implementation
/// This operation is `O(F)` where `F` is the number of fields.
/// # Panic
/// This function panics iff `offset + length >= self.len()`.
#[inline]
pub fn slice(&self, offset: usize, length: usize) -> Self {
Self {
data_type: self.data_type.clone(),
fields: self.fields.clone(),
fields_hash: self.fields_hash.clone(),
types: self.types.clone().slice(offset, length),
offsets: self.offsets.clone(),
offset: self.offset + offset,
}
}
}
impl Array for UnionArray {
fn as_any(&self) -> &dyn std::any::Any {
self
}
fn len(&self) -> usize {
self.types.len()
}
fn data_type(&self) -> &DataType {
&self.data_type
}
fn validity(&self) -> &Option<Bitmap> {
&None
}
fn slice(&self, offset: usize, length: usize) -> Box<dyn Array> {
Box::new(self.slice(offset, length))
}
}
impl UnionArray {
fn get_all(data_type: &DataType) -> (&[Field], Option<&[i32]>, bool) {
match data_type {
DataType::Union(fields, ids, is_sparse) => {
(fields, ids.as_ref().map(|x| x.as_ref()), *is_sparse)
}
DataType::Extension(_, inner, _) => Self::get_all(inner),
_ => panic!("Wrong datatype passed to UnionArray."),
}
}
pub fn get_fields(data_type: &DataType) -> &[Field] {
Self::get_all(data_type).0
}
pub fn is_sparse(data_type: &DataType) -> bool {
Self::get_all(data_type).2
}
}
impl std::fmt::Display for UnionArray {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let display = get_value_display(self);
let new_lines = false;
let head = "UnionArray";
let iter = self
.iter()
.enumerate()
.map(|(i, x)| if x.is_valid() { Some(display(i)) } else { None });
display_fmt(iter, head, f, new_lines)
}
}