public String getParametersString() {
    if (parametersString == null) {
      StringBuilder builder = new StringBuilder();
      if (!inputExpressions.isEmpty()) {
        builder.append(inputExpressions.get(0).getExpressionString());
        for (int i = 1; i < inputExpressions.size(); ++i) {
          builder.append(", ").append(inputExpressions.get(i).getExpressionString());
        }
      }
      appendAttributes(builder);
      parametersString = builder.toString();
    }
    return parametersString;
  }
Generates the parameter part of the function column name.

<p>Example:

<p>Full column name -> udf(root.sg.d.s1, sin(root.sg.d.s1))

<p>The parameter part -> root.sg.d.s1, sin(root.sg.d.s1)
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/plan/parameter/AggregationDescriptor.java