[D] Why the logic of pull-out for join is integrated within the transformation of JoinExecTransformer [incubator-gluten]

["jiangjiangtian (via GitHub)" <gi...@apache.org>]

GitHub user jiangjiangtian created a discussion: Why the logic of pull-out for join is integrated within the transformation of JoinExecTransformer

Recently I read the code about the process of pull-out and I notice that the the logic of pull-out for join is integrated within the transformation of JoinExecTransformer, and I don't know if there is any problem to put the the logic of pull-out for join into the rule `PullOutPreProject`, just like other operators?
Does anyone know the reason? Thanks for answering!

GitHub link: https://github.com/apache/incubator-gluten/discussions/10551

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