如何使用primeNg p-datatable生成'RowSpan‘

import { DataTableModule } from 'primeng/datatable';
import 'primeng/resources/themes/nova-light/theme.css';
import 'primeng/resources/primeng.min.css';

<p-dataTable [value]="data">
  <p-column field="column1" header="Column 1"></p-column>
  <p-column field="column2" header="Column 2"></p-column>
  ...
</p-dataTable>

<p-dataTable [value]="data">
  <p-column field="column1" header="Column 1" rowspan="getRowspan"></p-column>
  <p-column field="column2" header="Column 2"></p-column>
  ...
</p-dataTable>

getRowspan(rowData: any): number {
  if (this.previousRowData && this.previousRowData.column1 === rowData.column1) {
    return 0; // 不显示该行
  } else {
    this.previousRowData = rowData;
    return 1;
  }
}