@Override
  public void close() throws Exception {
    super.close();
    tableAggregators.forEach(TableAggregator::close);
  }
Append a row of aggregation results to the result tsBlock.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/operator/source/relational/AbstractAggTableScanOperator.java