RestSharp JSON Array deserialization

Try this:

var response = restClient.Execute<List<ReportResult>>(request);

EDIT

You should also change ReportResult to:

public class ReportResult
{
  public List<ColumnField> Columns { get; set; }
  public List<List<string>>   Rows { get; set; }
}

and you can get rid of Report and RowResult.

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