## 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/union.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::{Extend, _MutableArrayData};
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    use crate::ArrayData;
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    0
    pub(super) fn build_extend_sparse(array: &ArrayData) -> Extend<'_> {
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        let type_ids = array.buffer::<i8>(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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                // extends type_ids
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                mutable
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                    .buffer1
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                    .extend_from_slice(&type_ids[start..start + len]);
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                mutable
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                    .child_data
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                    .iter_mut()
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                    .for_each(|child| child.extend(index, start, start + len))
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            },
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        )
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    }
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    pub(super) fn build_extend_dense(array: &ArrayData) -> Extend<'_> {
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        let type_ids = array.buffer::<i8>(0);
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        let offsets = array.buffer::<i32>(1);
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        let arrow_schema::DataType::Union(src_fields, _) = array.data_type() else {
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            unreachable!();
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        };
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        Box::new(
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            move |mutable: &mut _MutableArrayData, index: usize, start: usize, len: usize| {
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                // extends type_ids
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                mutable
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                    .buffer1
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                    .extend_from_slice(&type_ids[start..start + len]);
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                (start..start + len).for_each(|i| {
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                    let type_id = type_ids[i];
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                    let child_index = src_fields
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                        .iter()
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                        .position(|(r, _)| r == type_id)
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                        .expect("invalid union type ID");
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                    let src_offset = offsets[i] as usize;
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                    let child_data = &mut mutable.child_data[child_index];
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                    let dst_offset = child_data.len();
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                    // Extend offsets
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                    mutable.buffer2.push(dst_offset as i32);
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                    mutable.child_data[child_index].extend(index, src_offset, src_offset + 1)
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                })
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            },
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        )
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    0
    }
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    pub(super) fn extend_nulls_dense(_mutable: &mut _MutableArrayData, _len: usize) {
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        panic!("cannot call extend_nulls on UnionArray as cannot infer type");
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    }
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    pub(super) fn extend_nulls_sparse(_mutable: &mut _MutableArrayData, _len: usize) {
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        panic!("cannot call extend_nulls on UnionArray as cannot infer type");
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    }