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cast.rs
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
//! Defines cast kernels for `ArrayRef`, to convert `Array`s between
//! supported datatypes.
//!
//! Example:
//!
//! ```
//! use arrow::array::*;
//! use arrow::compute::cast;
//! use arrow::datatypes::DataType;
//! use std::sync::Arc;
//!
//! let a = Int32Array::from(vec![5, 6, 7]);
//! let array = Arc::new(a) as ArrayRef;
//! let b = cast(&array, &DataType::Float64).unwrap();
//! let c = b.as_any().downcast_ref::<Float64Array>().unwrap();
//! assert_eq!(5.0, c.value(0));
//! assert_eq!(6.0, c.value(1));
//! assert_eq!(7.0, c.value(2));
//! ```
use std::str;
use std::sync::Arc;
use crate::buffer::Buffer;
use crate::compute::kernels::arithmetic::{divide, multiply};
use crate::datatypes::*;
use crate::error::{ArrowError, Result};
use crate::{array::*, compute::take};
/// Return true if a value of type `from_type` can be cast into a
/// value of `to_type`. Note that such as cast may be lossy.
///
/// If this function returns true to stay consistent with the `cast` kernel below.
pub fn can_cast_types(from_type: &DataType, to_type: &DataType) -> bool {
use self::DataType::*;
if from_type == to_type {
return true;
}
match (from_type, to_type) {
(Struct(_), _) => false,
(_, Struct(_)) => false,
(List(list_from), List(list_to)) => can_cast_types(list_from, list_to),
(List(_), _) => false,
(_, List(list_to)) => can_cast_types(from_type, list_to),
(Dictionary(_, from_value_type), Dictionary(_, to_value_type)) => {
can_cast_types(from_value_type, to_value_type)
}
(Dictionary(_, value_type), _) => can_cast_types(value_type, to_type),
(_, Dictionary(_, value_type)) => can_cast_types(from_type, value_type),
(_, Boolean) => DataType::is_numeric(from_type),
(Boolean, _) => DataType::is_numeric(to_type) || to_type == &Utf8,
(Utf8, _) => DataType::is_numeric(to_type),
(_, Utf8) => DataType::is_numeric(from_type) || from_type == &Binary,
// start numeric casts
(UInt8, UInt16) => true,
(UInt8, UInt32) => true,
(UInt8, UInt64) => true,
(UInt8, Int8) => true,
(UInt8, Int16) => true,
(UInt8, Int32) => true,
(UInt8, Int64) => true,
(UInt8, Float32) => true,
(UInt8, Float64) => true,
(UInt16, UInt8) => true,
(UInt16, UInt32) => true,
(UInt16, UInt64) => true,
(UInt16, Int8) => true,
(UInt16, Int16) => true,
(UInt16, Int32) => true,
(UInt16, Int64) => true,
(UInt16, Float32) => true,
(UInt16, Float64) => true,
(UInt32, UInt8) => true,
(UInt32, UInt16) => true,
(UInt32, UInt64) => true,
(UInt32, Int8) => true,
(UInt32, Int16) => true,
(UInt32, Int32) => true,
(UInt32, Int64) => true,
(UInt32, Float32) => true,
(UInt32, Float64) => true,
(UInt64, UInt8) => true,
(UInt64, UInt16) => true,
(UInt64, UInt32) => true,
(UInt64, Int8) => true,
(UInt64, Int16) => true,
(UInt64, Int32) => true,
(UInt64, Int64) => true,
(UInt64, Float32) => true,
(UInt64, Float64) => true,
(Int8, UInt8) => true,
(Int8, UInt16) => true,
(Int8, UInt32) => true,
(Int8, UInt64) => true,
(Int8, Int16) => true,
(Int8, Int32) => true,
(Int8, Int64) => true,
(Int8, Float32) => true,
(Int8, Float64) => true,
(Int16, UInt8) => true,
(Int16, UInt16) => true,
(Int16, UInt32) => true,
(Int16, UInt64) => true,
(Int16, Int8) => true,
(Int16, Int32) => true,
(Int16, Int64) => true,
(Int16, Float32) => true,
(Int16, Float64) => true,
(Int32, UInt8) => true,
(Int32, UInt16) => true,
(Int32, UInt32) => true,
(Int32, UInt64) => true,
(Int32, Int8) => true,
(Int32, Int16) => true,
(Int32, Int64) => true,
(Int32, Float32) => true,
(Int32, Float64) => true,
(Int64, UInt8) => true,
(Int64, UInt16) => true,
(Int64, UInt32) => true,
(Int64, UInt64) => true,
(Int64, Int8) => true,
(Int64, Int16) => true,
(Int64, Int32) => true,
(Int64, Float32) => true,
(Int64, Float64) => true,
(Float32, UInt8) => true,
(Float32, UInt16) => true,
(Float32, UInt32) => true,
(Float32, UInt64) => true,
(Float32, Int8) => true,
(Float32, Int16) => true,
(Float32, Int32) => true,
(Float32, Int64) => true,
(Float32, Float64) => true,
(Float64, UInt8) => true,
(Float64, UInt16) => true,
(Float64, UInt32) => true,
(Float64, UInt64) => true,
(Float64, Int8) => true,
(Float64, Int16) => true,
(Float64, Int32) => true,
(Float64, Int64) => true,
(Float64, Float32) => true,
// end numeric casts
// temporal casts
(Int32, Date32(_)) => true,
(Int32, Time32(_)) => true,
(Date32(_), Int32) => true,
(Time32(_), Int32) => true,
(Int64, Date64(_)) => true,
(Int64, Time64(_)) => true,
(Date64(_), Int64) => true,
(Time64(_), Int64) => true,
(Date32(DateUnit::Day), Date64(DateUnit::Millisecond)) => true,
(Date64(DateUnit::Millisecond), Date32(DateUnit::Day)) => true,
(Time32(TimeUnit::Second), Time32(TimeUnit::Millisecond)) => true,
(Time32(TimeUnit::Millisecond), Time32(TimeUnit::Second)) => true,
(Time32(_), Time64(_)) => true,
(Time64(TimeUnit::Microsecond), Time64(TimeUnit::Nanosecond)) => true,
(Time64(TimeUnit::Nanosecond), Time64(TimeUnit::Microsecond)) => true,
(Time64(_), Time32(to_unit)) => match to_unit {
TimeUnit::Second => true,
TimeUnit::Millisecond => true,
_ => false,
},
(Timestamp(_, _), Int64) => true,
(Int64, Timestamp(_, _)) => true,
(Timestamp(_, _), Timestamp(_, _)) => true,
(Timestamp(_, _), Date32(_)) => true,
(Timestamp(_, _), Date64(_)) => true,
// date64 to timestamp might not make sense,
(Null, Int32) => true,
(_, _) => false,
}
}
/// Cast `array` to the provided data type and return a new Array with
/// type `to_type`, if possible.
///
/// Behavior:
/// * Boolean to Utf8: `true` => '1', `false` => `0`
/// * Utf8 to numeric: strings that can't be parsed to numbers return null, float strings
/// in integer casts return null
/// * Numeric to boolean: 0 returns `false`, any other value returns `true`
/// * List to List: the underlying data type is cast
/// * Primitive to List: a list array with 1 value per slot is created
/// * Date32 and Date64: precision lost when going to higher interval
/// * Time32 and Time64: precision lost when going to higher interval
/// * Timestamp and Date{32|64}: precision lost when going to higher interval
/// * Temporal to/from backing primitive: zero-copy with data type change
///
/// Unsupported Casts
/// * To or from `StructArray`
/// * List to primitive
/// * Utf8 to boolean
/// * Interval and duration
pub fn cast(array: &ArrayRef, to_type: &DataType) -> Result<ArrayRef> {
use DataType::*;
let from_type = array.data_type();
// clone array if types are the same
if from_type == to_type {
return Ok(array.clone());
}
match (from_type, to_type) {
(Struct(_), _) => Err(ArrowError::ComputeError(
"Cannot cast from struct to other types".to_string(),
)),
(_, Struct(_)) => Err(ArrowError::ComputeError(
"Cannot cast to struct from other types".to_string(),
)),
(List(_), List(ref to)) => {
let data = array.data_ref();
let underlying_array = make_array(data.child_data()[0].clone());
let cast_array = cast(&underlying_array, &to)?;
let array_data = ArrayData::new(
*to.clone(),
array.len(),
Some(cast_array.null_count()),
cast_array
.data()
.null_bitmap()
.clone()
.map(|bitmap| bitmap.bits),
array.offset(),
// reuse offset buffer
data.buffers().to_vec(),
vec![cast_array.data()],
);
let list = ListArray::from(Arc::new(array_data));
Ok(Arc::new(list) as ArrayRef)
}
(List(_), _) => Err(ArrowError::ComputeError(
"Cannot cast list to non-list data types".to_string(),
)),
(_, List(ref to)) => {
// cast primitive to list's primitive
let cast_array = cast(array, &to)?;
// create offsets, where if array.len() = 2, we have [0,1,2]
let offsets: Vec<i32> = (0..=array.len() as i32).collect();
let value_offsets = Buffer::from(offsets[..].to_byte_slice());
let list_data = ArrayData::new(
*to.clone(),
array.len(),
Some(cast_array.null_count()),
cast_array
.data()
.null_bitmap()
.clone()
.map(|bitmap| bitmap.bits),
0,
vec![value_offsets],
vec![cast_array.data()],
);
let list_array = Arc::new(ListArray::from(Arc::new(list_data))) as ArrayRef;
Ok(list_array)
}
(Dictionary(index_type, _), _) => match **index_type {
DataType::Int8 => dictionary_cast::<Int8Type>(array, to_type),
DataType::Int16 => dictionary_cast::<Int16Type>(array, to_type),
DataType::Int32 => dictionary_cast::<Int32Type>(array, to_type),
DataType::Int64 => dictionary_cast::<Int64Type>(array, to_type),
DataType::UInt8 => dictionary_cast::<UInt8Type>(array, to_type),
DataType::UInt16 => dictionary_cast::<UInt16Type>(array, to_type),
DataType::UInt32 => dictionary_cast::<UInt32Type>(array, to_type),
DataType::UInt64 => dictionary_cast::<UInt64Type>(array, to_type),
_ => Err(ArrowError::ComputeError(format!(
"Casting from dictionary type {:?} to {:?} not supported",
from_type, to_type,
))),
},
(_, Dictionary(index_type, value_type)) => match **index_type {
DataType::Int8 => cast_to_dictionary::<Int8Type>(array, value_type),
DataType::Int16 => cast_to_dictionary::<Int16Type>(array, value_type),
DataType::Int32 => cast_to_dictionary::<Int32Type>(array, value_type),
DataType::Int64 => cast_to_dictionary::<Int64Type>(array, value_type),
DataType::UInt8 => cast_to_dictionary::<UInt8Type>(array, value_type),
DataType::UInt16 => cast_to_dictionary::<UInt16Type>(array, value_type),
DataType::UInt32 => cast_to_dictionary::<UInt32Type>(array, value_type),
DataType::UInt64 => cast_to_dictionary::<UInt64Type>(array, value_type),
_ => Err(ArrowError::ComputeError(format!(
"Casting from type {:?} to dictionary type {:?} not supported",
from_type, to_type,
))),
},
(_, Boolean) => match from_type {
UInt8 => cast_numeric_to_bool::<UInt8Type>(array),
UInt16 => cast_numeric_to_bool::<UInt16Type>(array),
UInt32 => cast_numeric_to_bool::<UInt32Type>(array),
UInt64 => cast_numeric_to_bool::<UInt64Type>(array),
Int8 => cast_numeric_to_bool::<Int8Type>(array),
Int16 => cast_numeric_to_bool::<Int16Type>(array),
Int32 => cast_numeric_to_bool::<Int32Type>(array),
Int64 => cast_numeric_to_bool::<Int64Type>(array),
Float32 => cast_numeric_to_bool::<Float32Type>(array),
Float64 => cast_numeric_to_bool::<Float64Type>(array),
Utf8 => Err(ArrowError::ComputeError(format!(
"Casting from {:?} to {:?} not supported",
from_type, to_type,
))),
_ => Err(ArrowError::ComputeError(format!(
"Casting from {:?} to {:?} not supported",
from_type, to_type,
))),
},
(Boolean, _) => match to_type {
UInt8 => cast_bool_to_numeric::<UInt8Type>(array),
UInt16 => cast_bool_to_numeric::<UInt16Type>(array),
UInt32 => cast_bool_to_numeric::<UInt32Type>(array),
UInt64 => cast_bool_to_numeric::<UInt64Type>(array),
Int8 => cast_bool_to_numeric::<Int8Type>(array),
Int16 => cast_bool_to_numeric::<Int16Type>(array),
Int32 => cast_bool_to_numeric::<Int32Type>(array),
Int64 => cast_bool_to_numeric::<Int64Type>(array),
Float32 => cast_bool_to_numeric::<Float32Type>(array),
Float64 => cast_bool_to_numeric::<Float64Type>(array),
Utf8 => {
let from = array.as_any().downcast_ref::<BooleanArray>().unwrap();
let mut b = StringBuilder::new(array.len());
for i in 0..array.len() {
if array.is_null(i) {
b.append(false)?;
} else {
b.append_value(if from.value(i) { "1" } else { "0" })?;
}
}
Ok(Arc::new(b.finish()) as ArrayRef)
}
_ => Err(ArrowError::ComputeError(format!(
"Casting from {:?} to {:?} not supported",
from_type, to_type,
))),
},
(Utf8, _) => match to_type {
UInt8 => cast_string_to_numeric::<UInt8Type>(array),
UInt16 => cast_string_to_numeric::<UInt16Type>(array),
UInt32 => cast_string_to_numeric::<UInt32Type>(array),
UInt64 => cast_string_to_numeric::<UInt64Type>(array),
Int8 => cast_string_to_numeric::<Int8Type>(array),
Int16 => cast_string_to_numeric::<Int16Type>(array),
Int32 => cast_string_to_numeric::<Int32Type>(array),
Int64 => cast_string_to_numeric::<Int64Type>(array),
Float32 => cast_string_to_numeric::<Float32Type>(array),
Float64 => cast_string_to_numeric::<Float64Type>(array),
_ => Err(ArrowError::ComputeError(format!(
"Casting from {:?} to {:?} not supported",
from_type, to_type,
))),
},
(_, Utf8) => match from_type {
UInt8 => cast_numeric_to_string::<UInt8Type>(array),
UInt16 => cast_numeric_to_string::<UInt16Type>(array),
UInt32 => cast_numeric_to_string::<UInt32Type>(array),
UInt64 => cast_numeric_to_string::<UInt64Type>(array),
Int8 => cast_numeric_to_string::<Int8Type>(array),
Int16 => cast_numeric_to_string::<Int16Type>(array),
Int32 => cast_numeric_to_string::<Int32Type>(array),
Int64 => cast_numeric_to_string::<Int64Type>(array),
Float32 => cast_numeric_to_string::<Float32Type>(array),
Float64 => cast_numeric_to_string::<Float64Type>(array),
Binary => {
let from = array.as_any().downcast_ref::<BinaryArray>().unwrap();
let mut b = StringBuilder::new(array.len());
for i in 0..array.len() {
if array.is_null(i) {
b.append_null()?;
} else {
match str::from_utf8(from.value(i)) {
Ok(s) => b.append_value(s)?,
Err(_) => b.append_null()?, // not valid UTF8
}
}
}
Ok(Arc::new(b.finish()) as ArrayRef)
}
_ => Err(ArrowError::ComputeError(format!(
"Casting from {:?} to {:?} not supported",
from_type, to_type,
))),
},
// start numeric casts
(UInt8, UInt16) => cast_numeric_arrays::<UInt8Type, UInt16Type>(array),
(UInt8, UInt32) => cast_numeric_arrays::<UInt8Type, UInt32Type>(array),
(UInt8, UInt64) => cast_numeric_arrays::<UInt8Type, UInt64Type>(array),
(UInt8, Int8) => cast_numeric_arrays::<UInt8Type, Int8Type>(array),
(UInt8, Int16) => cast_numeric_arrays::<UInt8Type, Int16Type>(array),
(UInt8, Int32) => cast_numeric_arrays::<UInt8Type, Int32Type>(array),
(UInt8, Int64) => cast_numeric_arrays::<UInt8Type, Int64Type>(array),
(UInt8, Float32) => cast_numeric_arrays::<UInt8Type, Float32Type>(array),
(UInt8, Float64) => cast_numeric_arrays::<UInt8Type, Float64Type>(array),
(UInt16, UInt8) => cast_numeric_arrays::<UInt16Type, UInt8Type>(array),
(UInt16, UInt32) => cast_numeric_arrays::<UInt16Type, UInt32Type>(array),
(UInt16, UInt64) => cast_numeric_arrays::<UInt16Type, UInt64Type>(array),
(UInt16, Int8) => cast_numeric_arrays::<UInt16Type, Int8Type>(array),
(UInt16, Int16) => cast_numeric_arrays::<UInt16Type, Int16Type>(array),
(UInt16, Int32) => cast_numeric_arrays::<UInt16Type, Int32Type>(array),
(UInt16, Int64) => cast_numeric_arrays::<UInt16Type, Int64Type>(array),
(UInt16, Float32) => cast_numeric_arrays::<UInt16Type, Float32Type>(array),
(UInt16, Float64) => cast_numeric_arrays::<UInt16Type, Float64Type>(array),
(UInt32, UInt8) => cast_numeric_arrays::<UInt32Type, UInt8Type>(array),
(UInt32, UInt16) => cast_numeric_arrays::<UInt32Type, UInt16Type>(array),
(UInt32, UInt64) => cast_numeric_arrays::<UInt32Type, UInt64Type>(array),
(UInt32, Int8) => cast_numeric_arrays::<UInt32Type, Int8Type>(array),
(UInt32, Int16) => cast_numeric_arrays::<UInt32Type, Int16Type>(array),
(UInt32, Int32) => cast_numeric_arrays::<UInt32Type, Int32Type>(array),
(UInt32, Int64) => cast_numeric_arrays::<UInt32Type, Int64Type>(array),
(UInt32, Float32) => cast_numeric_arrays::<UInt32Type, Float32Type>(array),
(UInt32, Float64) => cast_numeric_arrays::<UInt32Type, Float64Type>(array),
(UInt64, UInt8) => cast_numeric_arrays::<UInt64Type, UInt8Type>(array),
(UInt64, UInt16) => cast_numeric_arrays::<UInt64Type, UInt16Type>(array),
(UInt64, UInt32) => cast_numeric_arrays::<UInt64Type, UInt32Type>(array),
(UInt64, Int8) => cast_numeric_arrays::<UInt64Type, Int8Type>(array),
(UInt64, Int16) => cast_numeric_arrays::<UInt64Type, Int16Type>(array),
(UInt64, Int32) => cast_numeric_arrays::<UInt64Type, Int32Type>(array),
(UInt64, Int64) => cast_numeric_arrays::<UInt64Type, Int64Type>(array),
(UInt64, Float32) => cast_numeric_arrays::<UInt64Type, Float32Type>(array),
(UInt64, Float64) => cast_numeric_arrays::<UInt64Type, Float64Type>(array),
(Int8, UInt8) => cast_numeric_arrays::<Int8Type, UInt8Type>(array),
(Int8, UInt16) => cast_numeric_arrays::<Int8Type, UInt16Type>(array),
(Int8, UInt32) => cast_numeric_arrays::<Int8Type, UInt32Type>(array),
(Int8, UInt64) => cast_numeric_arrays::<Int8Type, UInt64Type>(array),
(Int8, Int16) => cast_numeric_arrays::<Int8Type, Int16Type>(array),
(Int8, Int32) => cast_numeric_arrays::<Int8Type, Int32Type>(array),
(Int8, Int64) => cast_numeric_arrays::<Int8Type, Int64Type>(array),
(Int8, Float32) => cast_numeric_arrays::<Int8Type, Float32Type>(array),
(Int8, Float64) => cast_numeric_arrays::<Int8Type, Float64Type>(array),
(Int16, UInt8) => cast_numeric_arrays::<Int16Type, UInt8Type>(array),
(Int16, UInt16) => cast_numeric_arrays::<Int16Type, UInt16Type>(array),
(Int16, UInt32) => cast_numeric_arrays::<Int16Type, UInt32Type>(array),
(Int16, UInt64) => cast_numeric_arrays::<Int16Type, UInt64Type>(array),
(Int16, Int8) => cast_numeric_arrays::<Int16Type, Int8Type>(array),
(Int16, Int32) => cast_numeric_arrays::<Int16Type, Int32Type>(array),
(Int16, Int64) => cast_numeric_arrays::<Int16Type, Int64Type>(array),
(Int16, Float32) => cast_numeric_arrays::<Int16Type, Float32Type>(array),
(Int16, Float64) => cast_numeric_arrays::<Int16Type, Float64Type>(array),
(Int32, UInt8) => cast_numeric_arrays::<Int32Type, UInt8Type>(array),
(Int32, UInt16) => cast_numeric_arrays::<Int32Type, UInt16Type>(array),
(Int32, UInt32) => cast_numeric_arrays::<Int32Type, UInt32Type>(array),
(Int32, UInt64) => cast_numeric_arrays::<Int32Type, UInt64Type>(array),
(Int32, Int8) => cast_numeric_arrays::<Int32Type, Int8Type>(array),
(Int32, Int16) => cast_numeric_arrays::<Int32Type, Int16Type>(array),
(Int32, Int64) => cast_numeric_arrays::<Int32Type, Int64Type>(array),
(Int32, Float32) => cast_numeric_arrays::<Int32Type, Float32Type>(array),
(Int32, Float64) => cast_numeric_arrays::<Int32Type, Float64Type>(array),
(Int64, UInt8) => cast_numeric_arrays::<Int64Type, UInt8Type>(array),
(Int64, UInt16) => cast_numeric_arrays::<Int64Type, UInt16Type>(array),
(Int64, UInt32) => cast_numeric_arrays::<Int64Type, UInt32Type>(array),
(Int64, UInt64) => cast_numeric_arrays::<Int64Type, UInt64Type>(array),
(Int64, Int8) => cast_numeric_arrays::<Int64Type, Int8Type>(array),
(Int64, Int16) => cast_numeric_arrays::<Int64Type, Int16Type>(array),
(Int64, Int32) => cast_numeric_arrays::<Int64Type, Int32Type>(array),
(Int64, Float32) => cast_numeric_arrays::<Int64Type, Float32Type>(array),
(Int64, Float64) => cast_numeric_arrays::<Int64Type, Float64Type>(array),
(Float32, UInt8) => cast_numeric_arrays::<Float32Type, UInt8Type>(array),
(Float32, UInt16) => cast_numeric_arrays::<Float32Type, UInt16Type>(array),
(Float32, UInt32) => cast_numeric_arrays::<Float32Type, UInt32Type>(array),
(Float32, UInt64) => cast_numeric_arrays::<Float32Type, UInt64Type>(array),
(Float32, Int8) => cast_numeric_arrays::<Float32Type, Int8Type>(array),
(Float32, Int16) => cast_numeric_arrays::<Float32Type, Int16Type>(array),
(Float32, Int32) => cast_numeric_arrays::<Float32Type, Int32Type>(array),
(Float32, Int64) => cast_numeric_arrays::<Float32Type, Int64Type>(array),
(Float32, Float64) => cast_numeric_arrays::<Float32Type, Float64Type>(array),
(Float64, UInt8) => cast_numeric_arrays::<Float64Type, UInt8Type>(array),
(Float64, UInt16) => cast_numeric_arrays::<Float64Type, UInt16Type>(array),
(Float64, UInt32) => cast_numeric_arrays::<Float64Type, UInt32Type>(array),
(Float64, UInt64) => cast_numeric_arrays::<Float64Type, UInt64Type>(array),
(Float64, Int8) => cast_numeric_arrays::<Float64Type, Int8Type>(array),
(Float64, Int16) => cast_numeric_arrays::<Float64Type, Int16Type>(array),
(Float64, Int32) => cast_numeric_arrays::<Float64Type, Int32Type>(array),
(Float64, Int64) => cast_numeric_arrays::<Float64Type, Int64Type>(array),
(Float64, Float32) => cast_numeric_arrays::<Float64Type, Float32Type>(array),
// end numeric casts
// temporal casts
(Int32, Date32(_)) => cast_array_data::<Date32Type>(array, to_type.clone()),
(Int32, Time32(TimeUnit::Second)) => {
cast_array_data::<Time32SecondType>(array, to_type.clone())
}
(Int32, Time32(TimeUnit::Millisecond)) => {
cast_array_data::<Time32MillisecondType>(array, to_type.clone())
}
// No support for microsecond/nanosecond with i32
(Date32(_), Int32) => cast_array_data::<Int32Type>(array, to_type.clone()),
(Time32(_), Int32) => cast_array_data::<Int32Type>(array, to_type.clone()),
(Int64, Date64(_)) => cast_array_data::<Date64Type>(array, to_type.clone()),
// No support for second/milliseconds with i64
(Int64, Time64(TimeUnit::Microsecond)) => {
cast_array_data::<Time64MicrosecondType>(array, to_type.clone())
}
(Int64, Time64(TimeUnit::Nanosecond)) => {
cast_array_data::<Time64NanosecondType>(array, to_type.clone())
}
(Date64(_), Int64) => cast_array_data::<Int64Type>(array, to_type.clone()),
(Time64(_), Int64) => cast_array_data::<Int64Type>(array, to_type.clone()),
(Date32(DateUnit::Day), Date64(DateUnit::Millisecond)) => {
let date_array = array.as_any().downcast_ref::<Date32Array>().unwrap();
let mut b = Date64Builder::new(array.len());
for i in 0..array.len() {
if array.is_null(i) {
b.append_null()?;
} else {
b.append_value(date_array.value(i) as i64 * MILLISECONDS_IN_DAY)?;
}
}
Ok(Arc::new(b.finish()) as ArrayRef)
}
(Date64(DateUnit::Millisecond), Date32(DateUnit::Day)) => {
let date_array = array.as_any().downcast_ref::<Date64Array>().unwrap();
let mut b = Date32Builder::new(array.len());
for i in 0..array.len() {
if array.is_null(i) {
b.append_null()?;
} else {
b.append_value((date_array.value(i) / MILLISECONDS_IN_DAY) as i32)?;
}
}
Ok(Arc::new(b.finish()) as ArrayRef)
}
(Time32(TimeUnit::Second), Time32(TimeUnit::Millisecond)) => {
let time_array = Time32MillisecondArray::from(array.data());
let mult =
Time32MillisecondArray::from(vec![MILLISECONDS as i32; array.len()]);
let time32_ms = multiply(&time_array, &mult)?;
Ok(Arc::new(time32_ms) as ArrayRef)
}
(Time32(TimeUnit::Millisecond), Time32(TimeUnit::Second)) => {
let time_array = Time32SecondArray::from(array.data());
let divisor = Time32SecondArray::from(vec![MILLISECONDS as i32; array.len()]);
let time32_s = divide(&time_array, &divisor)?;
Ok(Arc::new(time32_s) as ArrayRef)
}
(Time32(from_unit), Time64(to_unit)) => {
let time_array = Int32Array::from(array.data());
// note: (numeric_cast + SIMD multiply) is faster than (cast & multiply)
let c: Int64Array = numeric_cast(&time_array);
let from_size = time_unit_multiple(&from_unit);
let to_size = time_unit_multiple(&to_unit);
// from is only smaller than to if 64milli/64second don't exist
let mult = Int64Array::from(vec![to_size / from_size; array.len()]);
let converted = multiply(&c, &mult)?;
let array_ref = Arc::new(converted) as ArrayRef;
use TimeUnit::*;
match to_unit {
Microsecond => cast_array_data::<TimestampMicrosecondType>(
&array_ref,
to_type.clone(),
),
Nanosecond => cast_array_data::<TimestampNanosecondType>(
&array_ref,
to_type.clone(),
),
_ => unreachable!("array type not supported"),
}
}
(Time64(TimeUnit::Microsecond), Time64(TimeUnit::Nanosecond)) => {
let time_array = Time64NanosecondArray::from(array.data());
let mult = Time64NanosecondArray::from(vec![MILLISECONDS; array.len()]);
let time64_ns = multiply(&time_array, &mult)?;
Ok(Arc::new(time64_ns) as ArrayRef)
}
(Time64(TimeUnit::Nanosecond), Time64(TimeUnit::Microsecond)) => {
let time_array = Time64MicrosecondArray::from(array.data());
let divisor = Time64MicrosecondArray::from(vec![MILLISECONDS; array.len()]);
let time64_us = divide(&time_array, &divisor)?;
Ok(Arc::new(time64_us) as ArrayRef)
}
(Time64(from_unit), Time32(to_unit)) => {
let time_array = Int64Array::from(array.data());
let from_size = time_unit_multiple(&from_unit);
let to_size = time_unit_multiple(&to_unit);
let divisor = from_size / to_size;
match to_unit {
TimeUnit::Second => {
let mut b = Time32SecondBuilder::new(array.len());
for i in 0..array.len() {
if array.is_null(i) {
b.append_null()?;
} else {
b.append_value(
(time_array.value(i) as i64 / divisor) as i32,
)?;
}
}
Ok(Arc::new(b.finish()) as ArrayRef)
}
TimeUnit::Millisecond => {
// currently can't dedup this builder [ARROW-4164]
let mut b = Time32MillisecondBuilder::new(array.len());
for i in 0..array.len() {
if array.is_null(i) {
b.append_null()?;
} else {
b.append_value(
(time_array.value(i) as i64 / divisor) as i32,
)?;
}
}
Ok(Arc::new(b.finish()) as ArrayRef)
}
_ => unreachable!("array type not supported"),
}
}
(Timestamp(_, _), Int64) => cast_array_data::<Int64Type>(array, to_type.clone()),
(Int64, Timestamp(to_unit, _)) => {
use TimeUnit::*;
match to_unit {
Second => cast_array_data::<TimestampSecondType>(array, to_type.clone()),
Millisecond => {
cast_array_data::<TimestampMillisecondType>(array, to_type.clone())
}
Microsecond => {
cast_array_data::<TimestampMicrosecondType>(array, to_type.clone())
}
Nanosecond => {
cast_array_data::<TimestampNanosecondType>(array, to_type.clone())
}
}
}
(Timestamp(from_unit, _), Timestamp(to_unit, _)) => {
let time_array = Int64Array::from(array.data());
let from_size = time_unit_multiple(&from_unit);
let to_size = time_unit_multiple(&to_unit);
// we either divide or multiply, depending on size of each unit
// units are never the same when the types are the same
let converted = if from_size >= to_size {
divide(
&time_array,
&Int64Array::from(vec![from_size / to_size; array.len()]),
)?
} else {
multiply(
&time_array,
&Int64Array::from(vec![to_size / from_size; array.len()]),
)?
};
let array_ref = Arc::new(converted) as ArrayRef;
use TimeUnit::*;
match to_unit {
Second => {
cast_array_data::<TimestampSecondType>(&array_ref, to_type.clone())
}
Millisecond => cast_array_data::<TimestampMillisecondType>(
&array_ref,
to_type.clone(),
),
Microsecond => cast_array_data::<TimestampMicrosecondType>(
&array_ref,
to_type.clone(),
),
Nanosecond => cast_array_data::<TimestampNanosecondType>(
&array_ref,
to_type.clone(),
),
}
}
(Timestamp(from_unit, _), Date32(_)) => {
let time_array = Int64Array::from(array.data());
let from_size = time_unit_multiple(&from_unit) * SECONDS_IN_DAY;
let mut b = Date32Builder::new(array.len());
for i in 0..array.len() {
if array.is_null(i) {
b.append_null()?;
} else {
b.append_value((time_array.value(i) / from_size) as i32)?;
}
}
Ok(Arc::new(b.finish()) as ArrayRef)
}
(Timestamp(from_unit, _), Date64(_)) => {
let from_size = time_unit_multiple(&from_unit);
let to_size = MILLISECONDS;
// Scale time_array by (to_size / from_size) using a
// single integer operation, but need to avoid integer
// math rounding down to zero
match to_size.cmp(&from_size) {
std::cmp::Ordering::Less => {
let time_array = Date64Array::from(array.data());
Ok(Arc::new(divide(
&time_array,
&Date64Array::from(vec![from_size / to_size; array.len()]),
)?) as ArrayRef)
}
std::cmp::Ordering::Equal => {
cast_array_data::<Date64Type>(array, to_type.clone())
}
std::cmp::Ordering::Greater => {
let time_array = Date64Array::from(array.data());
Ok(Arc::new(multiply(
&time_array,
&Date64Array::from(vec![to_size / from_size; array.len()]),
)?) as ArrayRef)
}
}
}
// date64 to timestamp might not make sense,
// null to primitive/flat types
(Null, Int32) => Ok(Arc::new(Int32Array::from(vec![None; array.len()]))),
(_, _) => Err(ArrowError::ComputeError(format!(
"Casting from {:?} to {:?} not supported",
from_type, to_type,
))),
}
}
/// Get the time unit as a multiple of a second
fn time_unit_multiple(unit: &TimeUnit) -> i64 {
match unit {
TimeUnit::Second => 1,
TimeUnit::Millisecond => MILLISECONDS,
TimeUnit::Microsecond => MICROSECONDS,
TimeUnit::Nanosecond => NANOSECONDS,
}
}
/// Number of seconds in a day
const SECONDS_IN_DAY: i64 = 86_400;
/// Number of milliseconds in a second
const MILLISECONDS: i64 = 1_000;
/// Number of microseconds in a second
const MICROSECONDS: i64 = 1_000_000;
/// Number of nanoseconds in a second
const NANOSECONDS: i64 = 1_000_000_000;
/// Number of milliseconds in a day
const MILLISECONDS_IN_DAY: i64 = SECONDS_IN_DAY * MILLISECONDS;
/// Cast an array by changing its array_data type to the desired type
///
/// Arrays should have the same primitive data type, otherwise this should fail.
/// We do not perform this check on primitive data types as we only use this
/// function internally, where it is guaranteed to be infallible.
fn cast_array_data<TO>(array: &ArrayRef, to_type: DataType) -> Result<ArrayRef>
where
TO: ArrowNumericType,
{
let data = Arc::new(ArrayData::new(
to_type,
array.len(),
Some(array.null_count()),
array.data().null_bitmap().clone().map(|bitmap| bitmap.bits),
array.data().offset(),
array.data().buffers().to_vec(),
vec![],
));
Ok(Arc::new(PrimitiveArray::<TO>::from(data)) as ArrayRef)
}
/// Convert Array into a PrimitiveArray of type, and apply numeric cast
fn cast_numeric_arrays<FROM, TO>(from: &ArrayRef) -> Result<ArrayRef>
where
FROM: ArrowNumericType,
TO: ArrowNumericType,
FROM::Native: num::NumCast,
TO::Native: num::NumCast,
{
Ok(Arc::new(numeric_cast::<FROM, TO>(
from.as_any()
.downcast_ref::<PrimitiveArray<FROM>>()
.unwrap(),
)))
}
/// Natural cast between numeric types
fn numeric_cast<T, R>(from: &PrimitiveArray<T>) -> PrimitiveArray<R>
where
T: ArrowNumericType,
R: ArrowNumericType,
T::Native: num::NumCast,
R::Native: num::NumCast,
{
from.iter()
.map(|v| match v {
Some(v) => num::cast::cast::<T::Native, R::Native>(v),
None => None,
})
.collect()
}
/// Cast numeric types to Utf8
fn cast_numeric_to_string<FROM>(array: &ArrayRef) -> Result<ArrayRef>
where
FROM: ArrowNumericType,
FROM::Native: std::string::ToString,
{
numeric_to_string_cast::<FROM>(
array
.as_any()
.downcast_ref::<PrimitiveArray<FROM>>()
.unwrap(),
)
.map(|to| Arc::new(to) as ArrayRef)
}
fn numeric_to_string_cast<T>(from: &PrimitiveArray<T>) -> Result<StringArray>
where
T: ArrowPrimitiveType + ArrowNumericType,
T::Native: std::string::ToString,
{
let mut b = StringBuilder::new(from.len());
for i in 0..from.len() {
if from.is_null(i) {
b.append(false)?;
} else {
b.append_value(&from.value(i).to_string())?;
}
}
Ok(b.finish())
}
/// Cast numeric types to Utf8
fn cast_string_to_numeric<TO>(from: &ArrayRef) -> Result<ArrayRef>
where
TO: ArrowNumericType,
{
Ok(Arc::new(string_to_numeric_cast::<TO>(
from.as_any().downcast_ref::<StringArray>().unwrap(),
)))
}
fn string_to_numeric_cast<T>(from: &StringArray) -> PrimitiveArray<T>
where
T: ArrowNumericType,
{
(0..from.len())
.map(|i| {
if from.is_null(i) {
None
} else {
match from.value(i).parse::<T::Native>() {
Ok(v) => Some(v),
Err(_) => None,
}
}
})
.collect()
}
/// Cast numeric types to Boolean
///
/// Any zero value returns `false` while non-zero returns `true`
fn cast_numeric_to_bool<FROM>(from: &ArrayRef) -> Result<ArrayRef>
where
FROM: ArrowNumericType,
{
numeric_to_bool_cast::<FROM>(
from.as_any()
.downcast_ref::<PrimitiveArray<FROM>>()
.unwrap(),
)
.map(|to| Arc::new(to) as ArrayRef)
}
fn numeric_to_bool_cast<T>(from: &PrimitiveArray<T>) -> Result<BooleanArray>
where
T: ArrowPrimitiveType + ArrowNumericType,
{
let mut b = BooleanBuilder::new(from.len());
for i in 0..from.len() {
if from.is_null(i) {
b.append_null()?;
} else if from.value(i) != T::default_value() {
b.append_value(true)?;
} else {
b.append_value(false)?;
}
}
Ok(b.finish())
}
/// Cast Boolean types to numeric
///
/// `false` returns 0 while `true` returns 1
fn cast_bool_to_numeric<TO>(from: &ArrayRef) -> Result<ArrayRef>
where
TO: ArrowNumericType,
TO::Native: num::cast::NumCast,
{
Ok(Arc::new(bool_to_numeric_cast::<TO>(
from.as_any().downcast_ref::<BooleanArray>().unwrap(),
)))
}
fn bool_to_numeric_cast<T>(from: &BooleanArray) -> PrimitiveArray<T>
where
T: ArrowNumericType,
T::Native: num::NumCast,
{
(0..from.len())
.map(|i| {
if from.is_null(i) {
None
} else if from.value(i) {
// a workaround to cast a primitive to T::Native, infallible
num::cast::cast(1)
} else {
Some(T::default_value())
}
})
.collect()
}
/// Attempts to cast an `ArrayDictionary` with index type K into
/// `to_type` for supported types.
///
/// K is the key type
fn dictionary_cast<K: ArrowDictionaryKeyType>(
array: &ArrayRef,
to_type: &DataType,
) -> Result<ArrayRef> {
use DataType::*;
match to_type {
Dictionary(to_index_type, to_value_type) => {
let dict_array = array
.as_any()
.downcast_ref::<DictionaryArray<K>>()
.ok_or_else(|| {
ArrowError::ComputeError(
"Internal Error: Cannot cast dictionary to DictionaryArray of expected type".to_string(),
)
})?;
let keys_array: ArrayRef = Arc::new(dict_array.keys_array());
let values_array: ArrayRef = dict_array.values();
let cast_keys = cast(&keys_array, to_index_type)?;
let cast_values = cast(&values_array, to_value_type)?;
// Failure to cast keys (because they don't fit in the
// target type) results in NULL values;
if cast_keys.null_count() > keys_array.null_count() {
return Err(ArrowError::ComputeError(format!(
"Could not convert {} dictionary indexes from {:?} to {:?}",
cast_keys.null_count() - keys_array.null_count(),
keys_array.data_type(),
to_index_type
)));
}
// keys are data, child_data is values (dictionary)