private boolean canPushIntoScan(Expression pushDownPredicate) {
    return pushDownPredicate == null || PredicateUtils.predicateCanPushIntoScan(pushDownPredicate);
  }
This Visitor is responsible for transferring PlanNode Tree to Operator Tree.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/OperatorTreeGenerator.java