Method new

parquet/src/arrow/array_reader/cached_array_reader.rs:94–115

Creates a new cached array reader with the specified role

(
        inner: Box<dyn ArrayReader>,
        cache: Arc<RwLock<RowGroupCache>>,
        column_idx: usize,
        role: CacheRole,
        metrics: ArrowReaderMetrics,
    )

impl CachedArrayReader {
    /// Creates a new cached array reader with the specified role
    pub fn new(
        inner: Box<dyn ArrayReader>,
        cache: Arc<RwLock<RowGroupCache>>,
        column_idx: usize,
        role: CacheRole,
        metrics: ArrowReaderMetrics,
    ) -> Self {
        let batch_size = cache.read().unwrap().batch_size();

        Self {
            inner,
            shared_cache: cache,
            column_idx,
            outer_position: 0,
            inner_position: 0,
            batch_size,
            selections: BooleanBufferBuilder::new(0),
            role,
            local_cache: HashMap::new(),
            metrics,
        }
    }

    fn get_batch_id_from_position(&self, row_id: usize) -> BatchID {
        BatchID {