[I] [FLINK] Avoid mutable calls to `velox4j.plan.PlanNode#setSources()` [incubator-gluten]

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

zhztheplayer opened a new issue, #9566:
URL: https://github.com/apache/incubator-gluten/issues/9566

   ### Description
   
   [This API](https://github.com/bigo-sg/velox4j/blob/1239b1ea42961cacbe38294a01304f2acc0f10f3/src/main/java/io/github/zhztheplayer/velox4j/plan/PlanNode.java#L26-L28) added by `bigo-sg/velox4j` is powerful but breaks the immutability of the plan node. We look to replace the practice with one of the two possible options:
   
   1. Refactor gluten-flink's code to avoid the `setSources` calls;
   2. Add immutable `PlanNode#withNewSources` API or a builder-based API or so, which internally do copies on the query plan to change the sources.
   
   Either way would be more elegant than the current solution.
   
   ### Gluten version
   
   None


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