Cannot apply [＞] operation to types [ScriptDocValues.Doubles] and [java.lang.Integer]

原创已于 2024-01-30 15:44:56 修改 · 907 阅读

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文章标签：

#ScriptDocValues #Cannot apply #elasticsearch #operation #painless #script #scripted_metric

于 2024-01-30 15:42:52 首次发布

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文章讲述了在使用Elasticsearch的脚本指标统计时遇到的类型转换异常，原因是balance字段的ScriptDocValues.Doubles类型不支持直接比较。解决方法是通过getValue()获取原始值进行比较。

在使用elasticsearch脚本指标统计时，出现了异常：
脚本：

POST account_test/_search?size=0
{
  "query": {
    "match_all": {}
  },
  "aggs": {
    "balance_positive_sum": {
      "scripted_metric": {
        "init_script": "state.balances=[]",
        "map_script": "if(doc.balance > 0){state.balances.add( doc.balance)}",
        "combine_script": "double balanceSum=0;for(num in state.balances){balanceSum+=num} return balanceSum ",
        "reduce_script": "double balanceSum=0;for(num in states){balanceSum+=num} return balanceSum"
      }
    }
  }
}

异常：

{
  "error": {
    "root_cause": [
      {
        "type": "class_cast_exception",
        "reason": "class_cast_exception: Cannot apply [>] operation to types [org.elasticsearch.index.fielddata.ScriptDocValues.Doubles] and [java.lang.Integer]."
      }
    ],
    "type": "search_phase_execution_exception",
    "reason": "all shards failed",
    "phase": "query",
    "grouped": true,
    "failed_shards": [
      {
        "shard": 0,
        "index": "account_test",
        "node": "cdYh0ptNTP6kMXlVSE8dqA",
        "reason": {
          "type": "script_exception",
          "reason": "runtime error",
          "script_stack": [
            "if(doc.balance > 0){",
            "      ^---- HERE"
          ],
          "script": "if(doc.balance > 0){state.balances.add( doc.balance)}",
          "lang": "painless",
          "caused_by": {
            "type": "class_cast_exception",
            "reason": "class_cast_exception: Cannot apply [>] operation to types [org.elasticsearch.index.fielddata.ScriptDocValues.Doubles] and [java.lang.Integer]."
          }
        }
      }
    ],
    "caused_by": {
      "type": "class_cast_exception",
      "reason": "class_cast_exception: Cannot apply [>] operation to types [org.elasticsearch.index.fielddata.ScriptDocValues.Doubles] and [java.lang.Integer]."
    }
  },
  "status": 400
}

原因是在脚本中balance对应的类型是ScriptDocValues.Doubles，也就是封装类型，能直接执行>、<、=等操作，需要转原始类型。

解决办法：
调用getValue() 方法或者原始值。

POST account_test/_search?size=0
{
  "query": {
    "match_all": {}
  },
  "aggs": {
    "balance_positive_sum": {
      "scripted_metric": {
        "init_script": "state.balances=[]",
        "map_script": "if(doc.balance.getValue() > 0){state.balances.add( doc.balance.getValue())}",
        "combine_script": "double balanceSum=0;for(num in state.balances){balanceSum+=num} return balanceSum ",
        "reduce_script": "double balanceSum=0;for(num in states){balanceSum+=num} return balanceSum"
      }
    }
  }
}