While using ag-grid dataSurce, how can I know if the getRows function being called due to scrolling or filtering

Question

As we know, in infinite rowModelType, we have to set dataSource for the ag-grid.

const dataSource = {
  rowCount: count
  getRows: (params: IGetRowsParams) => this.getRows(params, [])
};
this.gridApi.setDatasource(dataSource);

Now, dataSource.getRows method is called whenever there is need to fetch the rows in the grid (due to scrolling) OR the filter is changed.

I need to decide how many ajax calls need to be made depending on this reason. Below code blocks explains this.

private getRows(params: IGetRowsParams, data: any) {
    // two ajax calls can be made from here
    // 1. getCount
    // 2. getData

    //  if this getRows function is called due to scrolling in the grid,
    //     I just want to call getData - no need to call getCount as I already know it
    //  if this is called due to change in filter,
    //     I need to call getCount as well as the no of rows will be different

    // How can I know here due to which above mentioned reasons, getRows is getting called?
}

Is there anyway to know it within getRows function?