## 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/primitive.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 crate::coalesce::InProgressArray;
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    use arrow_array::cast::AsArray;
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    use arrow_array::{Array, ArrayRef, ArrowPrimitiveType, PrimitiveArray};
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    use arrow_buffer::{NullBufferBuilder, ScalarBuffer};
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    use arrow_schema::{ArrowError, DataType};
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    use std::fmt::Debug;
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    use std::sync::Arc;
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    /// InProgressArray for [`PrimitiveArray`]
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    #[derive(Debug)]
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    pub(crate) struct InProgressPrimitiveArray<T: ArrowPrimitiveType> {
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        /// Data type of the array
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        data_type: DataType,
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        /// The current source, if any
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        source: Option<ArrayRef>,
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        /// the target batch size (and thus size for views allocation)
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        batch_size: usize,
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        /// In progress nulls
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        nulls: NullBufferBuilder,
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        /// The currently in progress array
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        current: Vec<T::Native>,
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    }
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    impl<T: ArrowPrimitiveType> InProgressPrimitiveArray<T> {
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        /// Create a new `InProgressPrimitiveArray`
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        pub(crate) fn new(batch_size: usize, data_type: DataType) -> Self {
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            Self {
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                data_type,
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                batch_size,
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                source: None,
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                nulls: NullBufferBuilder::new(batch_size),
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                current: vec![],
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            }
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        }
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        /// Allocate space for output values if necessary.
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        ///
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        /// This is done on write (when we know it is necessary) rather than
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        /// eagerly to avoid allocations that are not used.
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        fn ensure_capacity(&mut self) {
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            self.current.reserve(self.batch_size);
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        }
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    }
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    impl<T: ArrowPrimitiveType + Debug> InProgressArray for InProgressPrimitiveArray<T> {
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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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            self.ensure_capacity();
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            let s = self
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                .source
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                .as_ref()
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                .ok_or_else(|| {
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                    ArrowError::InvalidArgumentError(
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                        "Internal Error: InProgressPrimitiveArray: source not set".to_string(),
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                    )
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                })?
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                .as_primitive::<T>();
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            // add nulls if necessary
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            if let Some(nulls) = s.nulls().as_ref() {
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                let nulls = nulls.slice(offset, len);
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                self.nulls.append_buffer(&nulls);
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            } else {
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                self.nulls.append_n_non_nulls(len);
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            };
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            // Copy the values
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            self.current
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                .extend_from_slice(&s.values()[offset..offset + len]);
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            Ok(())
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        }
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        fn finish(&mut self) -> Result<ArrayRef, ArrowError> {
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            // take and reset the current values and nulls
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            let values = std::mem::take(&mut self.current);
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            let nulls = self.nulls.finish();
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            self.nulls = NullBufferBuilder::new(self.batch_size);
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            let array = PrimitiveArray::<T>::try_new(ScalarBuffer::from(values), nulls)?
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                // preserve timezone / precision+scale if applicable
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                .with_data_type(self.data_type.clone());
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            Ok(Arc::new(array))
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        }
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    }