## Coverage Report

#### Created: 2025-08-26 07:03

next uncovered line (L), next uncovered region (R), next uncovered branch (B)

    /Users/andrewlamb/Software/arrow-rs/arrow-data/src/transform/list.rs

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    // Licensed to the Apache Software Foundation (ASF) under one
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    // or more contributor license agreements.  See the NOTICE file
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    // distributed with this work for additional information
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    // regarding copyright ownership.  The ASF licenses this file
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    // to you under the Apache License, Version 2.0 (the
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    // "License"); you may not use this file except in compliance
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    // with the License.  You may obtain a copy of the License at
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    //
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    //   http://www.apache.org/licenses/LICENSE-2.0
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    //
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    // Unless required by applicable law or agreed to in writing,
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    // software distributed under the License is distributed on an
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    // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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    // KIND, either express or implied.  See the License for the
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    // specific language governing permissions and limitations
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    // under the License.
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    use super::{
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        Extend, _MutableArrayData,
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        utils::{extend_offsets, get_last_offset},
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    };
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    use crate::ArrayData;
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    use arrow_buffer::ArrowNativeType;
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    use num::{CheckedAdd, Integer};
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    pub(super) fn build_extend<T: ArrowNativeType + Integer + CheckedAdd>(
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        array: &ArrayData,
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    ) -> Extend<'_> {
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        let offsets = array.buffer::<T>(0);
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        Box::new(
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            move |mutable: &mut _MutableArrayData, index: usize, start: usize, len: usize| {
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                let offset_buffer = &mut mutable.buffer1;
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                // this is safe due to how offset is built. See details on `get_last_offset`
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                let last_offset: T = unsafe { get_last_offset(offset_buffer) };
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                // offsets
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                extend_offsets::<T>(offset_buffer, last_offset, &offsets[start..start + len + 1]);
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                mutable.child_data[0].extend(
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                    index,
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                    offsets[start].as_usize(),
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                    offsets[start + len].as_usize(),
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                )
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            },
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        )
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    }
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    pub(super) fn extend_nulls<T: ArrowNativeType>(mutable: &mut _MutableArrayData, len: usize) {
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        let offset_buffer = &mut mutable.buffer1;
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        // this is safe due to how offset is built. See details on `get_last_offset`
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        let last_offset: T = unsafe { get_last_offset(offset_buffer) };
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        (0..len).for_each(|_| offset_buffer.push(last_offset))
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    }