@Override
  public void initQueryDataSource(IQueryDataSource dataSource) {
    this.queryDataSource = (QueryDataSource) dataSource;
    this.seriesScanUtil.initQueryDataSource(queryDataSource);
    this.resultTsBlockBuilder = new TsBlockBuilder(getResultDataTypes());
  }
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