您可以使用以下规范

[// Preparation for the next spec for assigning default "null" for null values of which the attributes won't vanish
  {
    "operation": "default",
    "spec": {
      "*": {
        "*": "null"
      }
    }
  },
  {// Exchange key-value pairs
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "$": "&2.&1.@(0)"
        }
      }
    }
  },
  {// Split values by underscores in order to convert them to independent arrays for each attribute
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": {
        "*": {
          "*": "=split('_',@(1,&))"
        }
      }
    }
  },
  {// Convert all values to lowercase letters
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": {
        "*": {
          "*": {
            "*": "=toLower"
          }
        }
      }
    }
  },
  {// Enumerate each components of the arrays
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "*": {
            "*": "&3.&2.&1.&"
          }
        }
      }
    }
  },
  {// Split those components letterwise
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": {
        "*": {
          "*": {
            "*": "=split('',@(1,&))"
          }
        }
      }
    }
  },
  {// Enumerate each components of the arrays
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "*": {
            "*": {
              "*": "&4.&3.&2.&1.&"
            }
          }
        }
      }
    }
  },
  {
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": {// Convert only the first letters of the derived pieces to uppercase letters by use of 0th(zeroth) index
        "*": {
          "*": {
            "*": {
              "0": "=toUpper"
            }
          }
        }
      }
    }
  },
  {// Rearrange the elements to prepare to combine the pieces
    "operation": "shift",
    "spec": {
      "*": {
        "*": {
          "*": {
            "*": {
              "*": "&4.&3.&2"
            }
          }
        }
      }
    }
  },
  {// Combine the pieces in order to get new values
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": {
        "*": {
          "*": "=join('',@(1,&))"
        }
      }
    }
  },
  {
    "operation": "shift",
    "spec": {// Make values keys, while keys to values
      "*": {
        "*": {
          "*": {
            "$": "[&3].@(0)"
          }
        }
      }
    }
  },
  {
    "operation": "shift",
    "spec": {
      "*": {// get back again the real null values
        "*": {
          "null": "[&2].&1",
          "*": {
            "@1": "[&3].&2"
          }
        }
      }
    }
  }
]

有两个直接的障碍：
1.在键-值交换过程中消失null值。使用第一个和最后一个规范来处理这个问题。
1.相同的值会在应用键-值交换后阻止键的分离。为了处理这个问题，在规范中增加了一个额外的深度。

可以使用此等级库：

[
  {
    "operation": "shift",
    "spec": {
      "*": {
        "LAST_UPDT_TS": "[&1].lastUpdtTs",
        "RTRV_TS": "[&1].rtrvTs",
        "DOC_ID": "[&1].docId",
        "PARENT_ASSET_DOC_ID": "[&1].ParentAssetDocId",
        "ASSET_STATUS": "[&1].AssetStatus",
        "CAGE_NUM": "[&1].CageNum"
      }
    }
  }
]