In an earlier PR #11976 , we add shuffle join and bucket shuffle support. But if join's right child's distribution spec satisfied join's require, we do not add distribute on right child. Instead of, do it in plan translator.
It is hard to calculate accurate cost in this way, since we some distribute cost do not calculated.
In this PR, we introduce a new shuffle type BUCKET, and change the way of add enforce to ensure all necessary distribute will be added in cost and enforcer job.
7b46e2400f