parameters: (join_unit, length)
return_statement: return JoinUnit(block=extra_block, indexers=extra_indexers,
                      shape=extra_shape)
docstring: Reduce join_unit's shape along item axis to length.
  
      Extra items that didn't fit are returned as a separate block.
docstring_summary: Reduce join_unit's shape along item axis to length.
docstring_tokens: Reduce join_unit s shape along item axis to length .
function: def trim_join_unit(join_unit, length):
      """
      Reduce join_unit's shape along item axis to length.
  
      Extra items that didn't fit are returned as a separate block.
      """
  
      if 0 not in join_unit.indexers:
          extra_indexers = join_unit.indexers
  
          if join_unit.block is None:
              extra_block = None
          else:
              extra_block = join_unit.block.getitem_block(slice(length, None))
              join_unit.block = join_unit.block.getitem_block(slice(length))
      else:
          extra_block = join_unit.block
  
          extra_indexers = copy.copy(join_unit.indexers)
          extra_indexers[0] = extra_indexers[0][length:]
          join_unit.indexers[0] = join_unit.indexers[0][:length]
  
      extra_shape = (join_unit.shape[0] - length,) + join_unit.shape[1:]
      join_unit.shape = (length,) + join_unit.shape[1:]
  
      return JoinUnit(block=extra_block, indexers=extra_indexers,
                      shape=extra_shape)
function_tokens: def trim_join_unit ( join_unit , length ) : if 0 not in join_unit . indexers : extra_indexers = join_unit . indexers if join_unit . block is None : extra_block = None else : extra_block = join_unit . block . getitem_block ( slice ( length , None ) ) join_unit . block = join_unit . block . getitem_block ( slice ( length ) ) else : extra_block = join_unit . block extra_indexers = copy . copy ( join_unit . indexers ) extra_indexers [ 0 ] = extra_indexers [ 0 ] [ length : ] join_unit . indexers [ 0 ] = join_unit . indexers [ 0 ] [ : length ] extra_shape = ( join_unit . shape [ 0 ] - length , ) + join_unit . shape [ 1 : ] join_unit . shape = ( length , ) + join_unit . shape [ 1 : ] return JoinUnit ( block = extra_block , indexers = extra_indexers , shape = extra_shape )