@Override
  public String getParametersString() {
    if (parametersString == null) {
      StringBuilder builder;
      if (TAggregationType.COUNT_IF.equals(aggregationType)) {
        builder = new StringBuilder(outputExpressions.get(0).getExpressionString());
        for (int i = 1; i < expressionNumOfOneInput; i++) {
          builder.append(", ").append(inputExpressions.get(i).getExpressionString());
        }
        appendAttributes(builder);
      } else {
        builder = getOutputExpressionsAsBuilder();
      }
      parametersString = builder.toString();
    }
    return parametersString;
  }
Generates the parameter part of the output column name.

<p>Example:

<p>Full output column name -> count_if(root.*.*.s1, 3)

<p>The parameter part -> root.*.*.s1, 3
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/plan/parameter/CrossSeriesAggregationDescriptor.java