public static List<EquiJoinClause> flipBatch(List<EquiJoinClause> input) {
      ImmutableList.Builder<EquiJoinClause> builder = ImmutableList.builder();
      input.forEach(clause -> builder.add(clause.flip()));
      return builder.build();
    }
@return a new JoinNode with the flipped attributes
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/planner/node/JoinNode.java