@Override
  public void validate(PipeParameterValidator validator) throws Exception {
    // Do nothing by default
  }
{@link AbstractOperatorProcessor} is the formal processor defining the operators adoptable for
{@link AggregateProcessor}.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/pipe/processor/aggregate/operator/processor/AbstractOperatorProcessor.java