How to use the pydruid.utils.filters.Bound function in pydruid

lower=eq,
                    upper=None,
                    ordering=cls._get_ordering(is_numeric_col),
                )
            elif op == "<=":
                cond = Bound(
                    extraction_function=extraction_fn,
                    dimension=col,
                    lowerStrict=False,
                    upperStrict=False,
                    lower=None,
                    upper=eq,
                    ordering=cls._get_ordering(is_numeric_col),
                )
            elif op == ">":
                cond = Bound(
                    extraction_function=extraction_fn,
                    lowerStrict=True,
                    upperStrict=False,
                    dimension=col,
                    lower=eq,
                    upper=None,
                    ordering=cls._get_ordering(is_numeric_col),
                )
            elif op == "<":
                cond = Bound(
                    extraction_function=extraction_fn,
                    upperStrict=True,
                    lowerStrict=False,
                    dimension=col,
                    lower=None,
                    upper=eq,

)

            # For the ops below, could have used pydruid's Bound,
            # but it doesn't support extraction functions
            elif op == ">=":
                cond = Bound(
                    extraction_function=extraction_fn,
                    dimension=col,
                    lowerStrict=False,
                    upperStrict=False,
                    lower=eq,
                    upper=None,
                    ordering=cls._get_ordering(is_numeric_col),
                )
            elif op == "<=":
                cond = Bound(
                    extraction_function=extraction_fn,
                    dimension=col,
                    lowerStrict=False,
                    upperStrict=False,
                    lower=None,
                    upper=eq,
                    ordering=cls._get_ordering(is_numeric_col),
                )
            elif op == ">":
                cond = Bound(
                    extraction_function=extraction_fn,
                    lowerStrict=True,
                    upperStrict=False,
                    dimension=col,
                    lower=eq,
                    upper=None,

lower=None,
                    upper=eq,
                    ordering=cls._get_ordering(is_numeric_col),
                )
            elif op == ">":
                cond = Bound(
                    extraction_function=extraction_fn,
                    lowerStrict=True,
                    upperStrict=False,
                    dimension=col,
                    lower=eq,
                    upper=None,
                    ordering=cls._get_ordering(is_numeric_col),
                )
            elif op == "<":
                cond = Bound(
                    extraction_function=extraction_fn,
                    upperStrict=True,
                    lowerStrict=False,
                    dimension=col,
                    lower=None,
                    upper=eq,
                    ordering=cls._get_ordering(is_numeric_col),
                )
            elif op == "IS NULL":
                cond = Filter(dimension=col, value="")
            elif op == "IS NOT NULL":
                cond = ~Filter(dimension=col, value="")

            if filters:
                filters = Filter(type="and", fields=[cond, filters])
            else:

fields.append(Dimension(col) == s)
                    cond = Filter(type="or", fields=fields)
                if op == "not in":
                    cond = ~cond
            elif op == "regex":
                cond = Filter(
                    extraction_function=extraction_fn,
                    type="regex",
                    pattern=eq,
                    dimension=col,
                )

            # For the ops below, could have used pydruid's Bound,
            # but it doesn't support extraction functions
            elif op == ">=":
                cond = Bound(
                    extraction_function=extraction_fn,
                    dimension=col,
                    lowerStrict=False,
                    upperStrict=False,
                    lower=eq,
                    upper=None,
                    ordering=cls._get_ordering(is_numeric_col),
                )
            elif op == "<=":
                cond = Bound(
                    extraction_function=extraction_fn,
                    dimension=col,
                    lowerStrict=False,
                    upperStrict=False,
                    lower=None,
                    upper=eq,