Function write_path_with 

pub fn write_path_with(
    table: &TableInfo,
    source_id: usize,
    filter: Option<&BoundExpr>,
    levers: Levers,
) -> AccessPath

Returns how an UPDATE or a DELETE should find the rows it touches, with some optimizations switched off. @param table - the table being written @param source_id - the source the filter’s columns are bound to @param filter - the WHERE clause, when there is one @param levers - which optimizations are on