PivotGroup constructor
      
      PivotGroup({ 
    
    
- DataSourceColumnReference? dataSourceColumnReference,
- PivotGroupLimit? groupLimit,
- PivotGroupRule? groupRule,
- String? label,
- bool? repeatHeadings,
- bool? showTotals,
- String? sortOrder,
- int? sourceColumnOffset,
- PivotGroupSortValueBucket? valueBucket,
- List<PivotGroupValueMetadata> ? valueMetadata,
Implementation
PivotGroup({
  this.dataSourceColumnReference,
  this.groupLimit,
  this.groupRule,
  this.label,
  this.repeatHeadings,
  this.showTotals,
  this.sortOrder,
  this.sourceColumnOffset,
  this.valueBucket,
  this.valueMetadata,
});