

@dispatch(Field, Select)
def compute_up(expr, data, **kwargs):
    name = expr._name
    try:
        inner_columns = list(data.inner_columns)
        names = list((c.name for c in data.inner_columns))
        column = inner_columns[names.index(name)]
    except (KeyError, ValueError):
        single_column_select = compute(expr, first(data.inner_columns), post_compute=False, return_type='native')
        column = first(single_column_select.inner_columns)
        result = unify_froms(sa.select([column]), (data.froms + single_column_select.froms))
        return result.where(unify_wheres([result, single_column_select]))
    else:
        return data.with_only_columns([column])

dataset/ETHPy150Open blaze/blaze/blaze/compute/sql.py compute_up/VarMisuse@144/187 `data`->`result`