{
  "chain": [
    {
      "mapped": 0,
      "method": "BBG TICKER",
      "note": "no remaining rows"
    },
    {
      "mapped": 0,
      "method": "ISIN_OPERATING_MIC",
      "note": "no remaining rows"
    },
    {
      "mapped": 0,
      "method": "JUST ISIN",
      "note": "no remaining rows"
    }
  ],
  "drop_unmapped": 1,
  "dropped_unmapped": 0,
  "mapped_non_null": 0
}

{}