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Add support of converting FixedSizeBinaryArray to DecimalArray #2041

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merged 4 commits into from
Jul 15, 2022
Merged

Add support of converting FixedSizeBinaryArray to DecimalArray #2041

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32810bc
Add support of converting FixedSizeBinaryArray to Decimal
HaoYang670 Jul 11, 2022
775c6c3
Update arrow/src/array/array_decimal.rs
HaoYang670 Jul 13, 2022
d31f2e4
use better builder API
HaoYang670 Jul 13, 2022
7c12db4
trigger CI
HaoYang670 Jul 14, 2022
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64 changes: 63 additions & 1 deletion arrow/src/array/array_decimal.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,10 +20,10 @@ use std::convert::From;
use std::fmt;
use std::{any::Any, iter::FromIterator};

use super::BooleanBufferBuilder;
use super::{
array::print_long_array, raw_pointer::RawPtrBox, Array, ArrayData, FixedSizeListArray,
};
use super::{BooleanBufferBuilder, FixedSizeBinaryArray};
pub use crate::array::DecimalIter;
use crate::buffer::Buffer;
use crate::datatypes::DataType;
Expand Down Expand Up @@ -148,6 +148,32 @@ pub trait BasicDecimalArray<T: BasicDecimal, U: From<ArrayData>>:
self.value(row).to_string()
}

/// Build a decimal array from [`FixedSizeBinaryArray`].
///
/// NB: This function does not validate that each value is in the permissible
/// range for a decimal
fn from_fixed_size_binary_array(
v: FixedSizeBinaryArray,
precision: usize,
scale: usize,
) -> U {
assert!(
v.value_length() == Self::VALUE_LENGTH,
"Value length of the array ({}) must equal to the byte width of the decimal ({})",
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But from this message, this function is just used to convert to the decimal array.
@HaoYang670

v.value_length(),
Self::VALUE_LENGTH,
);

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You could use the new APIs for this

let builder = v
    .into_data()
    .into_builder()
    .data_type(DataType::Decimal(precision, scale));
Self::from(unsafe { builder.build_unchecked() });

Saves some clones and is slightly less verbose

let builder = ArrayData::builder(DataType::Decimal(precision, scale))
.len(v.len())
.add_buffer(v.value_data())
.null_bit_buffer(v.data_ref().null_buffer().cloned())
.offset(v.offset());

let array_data = unsafe { builder.build_unchecked() };
U::from(array_data)
}

fn from_fixed_size_list_array(
v: FixedSizeListArray,
precision: usize,
Expand Down Expand Up @@ -646,6 +672,42 @@ mod tests {
);
}

#[test]
fn test_decimal_array_from_fixed_size_binary() {
let value_data = ArrayData::builder(DataType::FixedSizeBinary(16))
.offset(1)
.len(3)
.add_buffer(Buffer::from_slice_ref(&[99999_i128, 2, 34, 560]))
.null_bit_buffer(Some(Buffer::from_slice_ref(&[0b1010])))
.build()
.unwrap();

let binary_array = FixedSizeBinaryArray::from(value_data);
let decimal = DecimalArray::from_fixed_size_binary_array(binary_array, 38, 1);

assert_eq!(decimal.len(), 3);
assert_eq!(decimal.value_as_string(0), "0.2".to_string());
assert!(decimal.is_null(1));
assert_eq!(decimal.value_as_string(2), "56.0".to_string());
}

#[test]
#[should_panic(
expected = "Value length of the array (8) must equal to the byte width of the decimal (16)"
)]
fn test_decimal_array_from_fixed_size_binary_wrong_length() {
let value_data = ArrayData::builder(DataType::FixedSizeBinary(8))
.offset(1)
.len(3)
.add_buffer(Buffer::from_slice_ref(&[99999_i64, 2, 34, 560]))
.null_bit_buffer(Some(Buffer::from_slice_ref(&[0b1010])))
.build()
.unwrap();

let binary_array = FixedSizeBinaryArray::from(value_data);
let _ = DecimalArray::from_fixed_size_binary_array(binary_array, 38, 1);
}

#[test]
fn test_decimal_array_from_fixed_size_list() {
let value_data = ArrayData::builder(DataType::UInt8)
Expand Down