## 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-select/src/coalesce/generic.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::InProgressArray;
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    use crate::concat::concat;
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    use arrow_array::ArrayRef;
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    use arrow_schema::ArrowError;
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    /// Generic implementation for [`InProgressArray`] that works with any type of
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    /// array.
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    ///
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    /// Internally, this buffers arrays and then calls other kernels such as
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    /// [`concat`] to produce the final array.
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    ///
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    /// [`concat`]: crate::concat::concat
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    #[derive(Debug)]
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    pub(crate) struct GenericInProgressArray {
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        /// The current source
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        source: Option<ArrayRef>,
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        /// The buffered array slices
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        buffered_arrays: Vec<ArrayRef>,
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    }
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    impl GenericInProgressArray {
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        /// Create a new `GenericInProgressArray`
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        pub(crate) fn new() -> Self {
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            Self {
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                source: None,
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                buffered_arrays: vec![],
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            }
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        }
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    }
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    impl InProgressArray for GenericInProgressArray {
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        fn set_source(&mut self, source: Option<ArrayRef>) {
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            self.source = source
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        }
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        fn copy_rows(&mut self, offset: usize, len: usize) -> Result<(), ArrowError> {
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            let source = self.source.as_ref().ok_or_else(|| {
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                ArrowError::InvalidArgumentError(
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                    "Internal Error: GenericInProgressArray: source not set".to_string(),
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                )
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            })?;
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            let array = source.slice(offset, len);
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            self.buffered_arrays.push(array);
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            Ok(())
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        }
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        fn finish(&mut self) -> Result<ArrayRef, ArrowError> {
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            // Concatenate all buffered arrays into a single array, which uses 2x
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            // peak memory
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            let array = concat(
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                &self
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                    .buffered_arrays
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                    .iter()
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                    .map(|array| array.as_ref())
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                    .collect::<Vec<_>>(),
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            )?;
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            self.buffered_arrays.clear();
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            Ok(array)
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        }
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    }