Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/23208
@rdblue I tried to add `WriteBuilder`, but there is a difference between
read and write:
1. for read, the `ScanBuilder` can collect many information, like column
pruning, filter pushdown, etc. together, and create a `Scan`
2. for write, it's just different branches, not a combination. e.g. you
can't do append and replaceWhere at the same time.
Because of this, I feel we don't need `WriterBuilder`, but just different
mixin traits to create `Write` for different purposes.
Let me know if you have other ideas. Thanks for your review!
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