daft.functions.lower#

def lower(expr: Expression) -> Expression:
    """Convert UTF-8 string to all lowercase.

    Returns:
        Expression: a String expression which is `self` lowercased

    Examples:
        >>> import daft
        >>> from daft.functions import lower
        >>> df = daft.from_pydict({"x": ["FOO", "BAR", "BAZ"]})
        >>> df = df.select(lower(df["x"]))
        >>> df.show()
        ╭────────╮
        │ x      │
        │ ---    │
        │ String │
        ╞════════╡
        │ foo    │
        ├╌╌╌╌╌╌╌╌┤
        │ bar    │
        ├╌╌╌╌╌╌╌╌┤
        │ baz    │
        ╰────────╯
        <BLANKLINE>
        (Showing first 3 of 3 rows)

    """
    return Expression._call_builtin_scalar_fn("lower", expr)