Java 钻取错误：不支持的\u操作错误：VarChar类型仅支持COUNT、MIN和MAX聚合函数

下面是csv文件

csv文件：

STATE,place,populationmales,populationfemales,literatemales,literatefemales
JAMMU & KASHMIR,Urban,1855942,1558164,1386708,960337
Kupwara,Rural,418370,357952,245342,148633
Kupwara,Urban,56756,42486,39055,21046

查询：

select `state`,sum(`populationmales`) from dfs.`/Users/ks1162/Documents/pmv.csv` GROUP BY `state`;

当我查询不是varchar类型的“PopulationMeans”的总和时，仍然会出现错误

错误：

UNSUPPORTED_OPERATION ERROR: Only COUNT, MIN and MAX aggregate functions supported for VarChar type

以下是存储插件中csv文件的配置：

"csv": {
  "type": "text",
  "extensions": [
    "csv"
  ],
  "extractHeader": true,
  "delimiter": ","
},

---

默认情况下，Drill以VARCHAR的形式从CSV文件中读取数据。您应该将所需列强制转换为BIGINT：

select `state`,sum(cast(`populationmales` as BIGINT)) from dfs.`/Users/ks1162/Documents/pmv.csv` GROUP BY `state`;

或使用架构配置功能（有关更多详细信息，请参阅）