| // 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 crate::{ |
| array::{ArrayData, OffsetSizeTrait}, |
| buffer::MutableBuffer, |
| }; |
| |
| use super::{ |
| Extend, _MutableArrayData, |
| utils::{extend_offsets, get_last_offset}, |
| }; |
| |
| #[inline] |
| fn extend_offset_values<T: OffsetSizeTrait>( |
| buffer: &mut MutableBuffer, |
| offsets: &[T], |
| values: &[u8], |
| start: usize, |
| len: usize, |
| ) { |
| let start_values = offsets[start].to_usize().unwrap(); |
| let end_values = offsets[start + len].to_usize().unwrap(); |
| let new_values = &values[start_values..end_values]; |
| buffer.extend_from_slice(new_values); |
| } |
| |
| pub(super) fn build_extend<T: OffsetSizeTrait>(array: &ArrayData) -> Extend { |
| let offsets = array.buffer::<T>(0); |
| let values = array.buffers()[1].as_slice(); |
| if array.null_count() == 0 { |
| // fast case where we can copy regions without null issues |
| Box::new( |
| move |mutable: &mut _MutableArrayData, _, start: usize, len: usize| { |
| let offset_buffer = &mut mutable.buffer1; |
| let values_buffer = &mut mutable.buffer2; |
| |
| // this is safe due to how offset is built. See details on `get_last_offset` |
| let last_offset = unsafe { get_last_offset(offset_buffer) }; |
| |
| extend_offsets::<T>( |
| offset_buffer, |
| last_offset, |
| &offsets[start..start + len + 1], |
| ); |
| // values |
| extend_offset_values::<T>(values_buffer, offsets, values, start, len); |
| }, |
| ) |
| } else { |
| Box::new( |
| move |mutable: &mut _MutableArrayData, _, start: usize, len: usize| { |
| let offset_buffer = &mut mutable.buffer1; |
| let values_buffer = &mut mutable.buffer2; |
| |
| // 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) }; |
| |
| // nulls present: append item by item, ignoring null entries |
| offset_buffer.reserve(len * std::mem::size_of::<T>()); |
| |
| (start..start + len).for_each(|i| { |
| if array.is_valid(i) { |
| // compute the new offset |
| let length = offsets[i + 1] - offsets[i]; |
| last_offset += length; |
| |
| // append value |
| let bytes = &values[offsets[i].to_usize().unwrap() |
| ..offsets[i + 1].to_usize().unwrap()]; |
| values_buffer.extend_from_slice(bytes); |
| } |
| // offsets are always present |
| offset_buffer.push(last_offset); |
| }) |
| }, |
| ) |
| } |
| } |
| |
| pub(super) fn extend_nulls<T: OffsetSizeTrait>( |
| 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)) |
| } |