code: def test_multivalue():
      schema = fields.Schema(
          s=fields.TEXT(sortable=True), n=fields.NUMERIC(sortable=True)
      )
      ix = RamStorage().create_index(schema)
      with ix.writer(codec=W3Codec()) as w:
          w.add_document(
              s=u("alfa foxtrot charlie").split(), n=[100, 200, 300]
          )
          w.add_document(
              s=u("juliet bravo india").split(), n=[10, 20, 30]
          )
  
      with ix.reader() as r:
          scr = r.column_reader("s")
          assert list(scr) == ["alfa", "juliet"]
  
          ncr = r.column_reader("n")
          assert list(ncr) == [100, 10]
  
file_path: whoosh/tests/test_columns.py
imports: from __future__ import with_statement
  import inspect, random, sys
  from whoosh import columns, fields, query
  from whoosh.codec.whoosh3 import W3Codec
  from whoosh.compat import b, u, BytesIO, bytes_type, text_type
  from whoosh.compat import izip, xrange, dumps, loads
  from whoosh.filedb import compound
  from whoosh.filedb.filestore import RamStorage
  from whoosh.util.testing import TempIndex, TempStorage
label_desc: Use image node_id 6 for calling a global function with example usage: test_multivalue() without return types