Function duckdb_validity_set_row_validity 

pub unsafe extern "C" fn duckdb_validity_set_row_validity(
    validity: *mut u64,
    row: idx_t,
    valid: bool,
)

In a validity mask, sets a specific row to either valid or invalid.

Note that duckdb_vector_ensure_validity_writable should be called before calling duckdb_vector_get_validity, to ensure that there is a validity mask to write to.

@param validity The validity mask, as obtained through duckdb_vector_get_validity. @param row The row index @param valid Whether or not to set the row to valid, or invalid