Function _replace_common_or_components

dask/dataframe/dask_expr/_expr.py:4023–4060

(expr, or_components)

def _replace_common_or_components(expr, or_components):
    and_component = _get_predicate_components(expr, [], type_=And)
    mapping = _convert_mapping(and_component)
    and_components = [
        _get_predicate_components(c, [], type_=And) for c in or_components
    ]
    and_components = list(map(_convert_mapping, and_components))

    replacements = []
    for c in mapping.keys():
        if all(c in comp for comp in and_components):
            # We can pull this component out if it's part of all or components
            replacements.append(c)
    if len(replacements) == 0:
        # exit if we can't replace anything
        return

    outer_component = mapping[replacements[0]]
    for r in replacements[1:]:
        # construct the outer component
        outer_component = outer_component & mapping[r]

    #
    result_components = []
    for comp in [mapping] + and_components:
        keep_components = [c for c in comp if c not in replacements]
        if len(keep_components) == 0:
            # Just return outer_component if we can replace a whole OR component
            return outer_component
        result_component = comp[keep_components[0]]
        for c in keep_components[1:]:
            result_component = result_component & comp[c]
        result_components.append(result_component)

    or_component = result_components[0]
    for c in result_components[1:]:
        or_component = or_component | c
    return outer_component & or_component


def _check_dependents_are_predicates(