Function need_produce_result_in_final 

pub(crate) fn need_produce_result_in_final(join_type: JoinType) -> bool

Some type join_type of join need to maintain the matched indices bit map for the left side, and use the bit map to generate the part of result of the join.

For example of the Left join, in each iteration of right side, can get the matched result, but need to maintain the matched indices bit map to get the unmatched row for the left side.