@Override
  public Result apply(ProjectNode project, Captures captures, Context context) {
    return Result.ofPlanNode(project.getChild());
  }
Removes projection nodes that only perform non-renaming identity projections
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/planner/iterative/rule/RemoveRedundantIdentityProjections.java