/
list.rs
102 lines (90 loc) · 3.66 KB
/
list.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.
use super::{
Extend, _MutableArrayData,
utils::{extend_offsets, get_last_offset},
};
use crate::ArrayData;
use arrow_buffer::ArrowNativeType;
use num::{CheckedAdd, Integer};
pub(super) fn build_extend<T: ArrowNativeType + Integer + CheckedAdd>(
array: &ArrayData,
) -> Extend {
let offsets = array.buffer::<T>(0);
if array.null_count() == 0 {
// fast case where we can copy regions without nullability checks
Box::new(
move |mutable: &mut _MutableArrayData,
index: usize,
start: usize,
len: usize| {
let offset_buffer = &mut mutable.buffer1;
// this is safe due to how offset is built. See details on `get_last_offset`
let last_offset: T = unsafe { get_last_offset(offset_buffer) };
// offsets
extend_offsets::<T>(
offset_buffer,
last_offset,
&offsets[start..start + len + 1],
);
mutable.child_data[0].extend(
index,
offsets[start].as_usize(),
offsets[start + len].as_usize(),
)
},
)
} else {
// nulls present: append item by item, ignoring null entries
Box::new(
move |mutable: &mut _MutableArrayData,
index: usize,
start: usize,
len: usize| {
let offset_buffer = &mut mutable.buffer1;
// this is safe due to how offset is built. See details on `get_last_offset`
let mut last_offset: T = unsafe { get_last_offset(offset_buffer) };
let delta_len = array.len() - array.null_count();
offset_buffer.reserve(delta_len * std::mem::size_of::<T>());
let child = &mut mutable.child_data[0];
(start..start + len).for_each(|i| {
if array.is_valid(i) {
// compute the new offset
last_offset = last_offset + offsets[i + 1] - offsets[i];
// append value
child.extend(
index,
offsets[i].as_usize(),
offsets[i + 1].as_usize(),
);
}
// append offset
offset_buffer.push(last_offset);
})
},
)
}
}
pub(super) fn extend_nulls<T: ArrowNativeType>(
mutable: &mut _MutableArrayData,
len: usize,
) {
let offset_buffer = &mut mutable.buffer1;
// this is safe due to how offset is built. See details on `get_last_offset`
let last_offset: T = unsafe { get_last_offset(offset_buffer) };
(0..len).for_each(|_| offset_buffer.push(last_offset))
}