/// <summary>根据聚合条件获取统计信息</summary>
public virtual async Task <SearchStatisticsResult> StatisticsAsync(SearchStatisticsRequest request)
{
var provider = new SearchProvider <Metadata>();
SearchGroupRules groups = new SearchGroupRules();
groups.Top = int.MaxValue / 2;
groups.Fields = request.Groups;
var aggs = provider.BuildAggs(groups);
var searchresponse = await _esAccess.PagingQueryAsync(null, null, null, aggs, 0, 0);
SearchStatisticsResult result = new SearchStatisticsResult();
var groupResult = new Dictionary <string, Dictionary <string, long?> >();
foreach (var agg in searchresponse.Aggregations)
{
var aggregates = agg.Value.As <BucketAggregate>().Items;
Dictionary <string, long?> dic = new Dictionary <string, long?>();
foreach (var aggregate in aggregates)
{
var keyedBucket = aggregate as Nest.KeyedBucket <object>;
if (keyedBucket != null)
{
dic.Add(keyedBucket.Key.ToString(), keyedBucket.DocCount);
}
}
groupResult.Add(agg.Key, dic);
}
result.Groups = groupResult;
return(result);
}
///// <summary>
///// 获得排序脚本
///// </summary>
///// <param name="sort">排序规则</param>
///// <param name="field">排序字段</param>
///// <returns></returns>
//private static string GetOrderScript(Sort sort, string field)
//{
// var value = sort.Promotion;
// var sb = new StringBuilder();
// for (int i = 0; i < value.Count + 1; i++)
// {
// string scriptText;
// string itemValue;
// if (i == 0)
// {
// itemValue = value[i].Trim();
// // scriptText = $"if('{itemValue}' == doc['{field.KeyWord()}'].value)return 0;";
// scriptText = $"'{itemValue}'==doc['{field.KeyWord()}'].value?0";
// }
// else if (i == value.Count)
// {
// // scriptText = $"else return {value.Count}";
// scriptText = $":{i}";
// for (var j = 0; j < value.Count - 1; j++)
// {
// scriptText += ")";
// }
// }
// else
// {
// itemValue = value[i];
// //scriptText = $"else if('{itemValue}' == doc['{field.KeyWord()}'].value)return {i};";
// scriptText = $":('{itemValue}'==doc['{field.KeyWord()}'].value?{i}";
// }
// sb.Append(scriptText);
// }
// return sb.ToString();
//}
/// <summary>
/// 根据聚合条件构建聚合器
/// </summary>
/// <param name="groups">聚合条件</param>
/// <returns></returns>
public AggregationContainerDescriptor <T> BuildAggs(SearchGroupRules groups)
{
if (groups == null || groups.Fields.Count == 0)
{
return(null);
}
var aggsDesc = new AggregationContainerDescriptor <T>();
foreach (var gfield in groups.Fields)
{
aggsDesc.Terms(gfield, s => s.Field(KeyWord(gfield)).Size(groups.Top).OrderDescending("_count"));
}
return(aggsDesc);
}
