Return WHERE clause predicates for (a)search() given metadata filter
and before config.
This method returns a tuple of a string and a tuple of values. The string is the parametered WHERE clause predicate (including the WHERE keyword): "WHERE column1 = ? AND column2 IS ?". The tuple of values contains the values for each of the corresponding parameters.
search_where(
config: RunnableConfig | None,
filter: dict[str, Any] | None,
before: RunnableConfig | None = None
) -> tuple[str, Sequence[Any]]