private QueryDataSourceType getQueryDataSourceType(DataDriverContext dataDriverContext) {
    return dataDriverContext.getQueryDataSourceType().orElse(QueryDataSourceType.SERIES_SCAN);
  }
Used to plan a fragment instance. One fragment instance could be split into multiple pipelines so
that a fragment instance could be run in parallel, and thus we can take full advantages of
multi-cores.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/LocalExecutionPlanner.java