code: def open_file(
      source, footer_offset=None, *, options=None, memory_pool=None
  ):
      """
      Create reader for Arrow file format.
  
      Parameters
      ----------
      source : bytes/buffer-like, pyarrow.NativeFile, or file-like Python object
          Either an in-memory buffer, or a readable file object.
      footer_offset : int, default None
          If the file is embedded in some larger file, this is the byte offset to
          the very end of the file data.
      options : pyarrow.ipc.IpcReadOptions
          Options for IPC serialization.
          If None, default values will be used.
      memory_pool : MemoryPool, default None
          If None, default memory pool is used.
  
      Returns
      -------
      reader : RecordBatchFileReader
          A reader for the given source
      """
      return RecordBatchFileReader(
          source,
          footer_offset=footer_offset,
          options=options,
          memory_pool=memory_pool,
      )
  
imports: import os
  import pyarrow
  from pyarrow.lib import IpcReadOptions, IpcWriteOptions, ReadStats, WriteStats, Message, MessageReader, RecordBatchReader, _ReadPandasMixin, MetadataVersion, read_message, read_record_batch, read_schema, read_tensor, write_tensor, get_record_batch_size, get_tensor_size
  import pyarrow.lib
label_desc: Use image node_id 6 for calling a global function with example usage: open_file(source, footer_offset) and returns: RecordBatchFileReader