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e470f311d6
The idea behind this change is, that AlterUniqueTogether, AlterIndexTogether and AlterOrderWithRespectTo can always be moved after an Add/Alter/Rename/RemoveField operation if they don't refer to the respective field and are not empty sets / None. Combined with the optimizations of duplicate AlterUniqueTogether, AlterIndexTogether, and AlterOrderWithRespectTo operations from 128caa1e16ec2627737748f75c8e55600a3df97f, these operations are optimized in a later round of the optimizer. Thanks Tim Graham for the review.