code: def register_column(self,
                          column,
                          expr,
                          deltas=None,
                          checkpoints=None,
                          odo_kwargs=None):
          
          self._table_expressions[column] = ExprData(
              expr,
              deltas,
              checkpoints,
              odo_kwargs,
          )
docs: Explicitly map a single bound column to a collection of blaze
          expressions. The expressions need to have ``timestamp`` and ``as_of``
          columns.
  
          Parameters
          ----------
          column : BoundColumn
              The pipeline dataset to map to the given expressions.
          expr : Expr
              The baseline values.
          deltas : Expr, optional
              The deltas for the data.
          checkpoints : Expr, optional
              The forward fill checkpoints for the data.
          odo_kwargs : dict, optional
              The keyword arguments to forward to the odo calls internally.
  
          See Also
          --------
          :func:`zipline.pipeline.loaders.blaze.from_blaze`