Function arrow2::mmap::mmap_unchecked

pub unsafe fn mmap_unchecked<T: AsRef<[u8]>>(
    metadata: &FileMetadata,
    dictionaries: &Dictionaries,
    data: Arc<T>,
    chunk: usize
) -> Result<Chunk<Box<dyn Array>>, Error>

Available on crate feature io_ipc only.

Memory maps an record batch from an IPC file into a Chunk.

Errors

This function errors when:

• The IPC file is not valid
• the buffers on the file are un-aligned with their corresponding data. This can happen when:
  • the file was written with 8-bit alignment
  • the file contains type decimal 128 or 256

Safety

The caller must ensure that data contains a valid buffers, for example:

• Offsets in variable-sized containers must be in-bounds and increasing
• Utf8 data is valid