{
  "distinct": false,
  "targets": [
    {
      "child": {
        "name": "dt",
        "type": "Column"
      },
      "type": "Target"
    },
    {
      "child": {
        "function": {
          "distinct": false,
          "signature": "sum",
          "params": [
            {
              "name": "xy",
              "type": "Column"
            }
          ],
          "type": "GeneralSetFunction"
        },
        "windowSpec": {
          "sortSpecs": [
            {
              "key": {
                "name": "dt",
                "type": "Column"
              },
              "asc": true,
              "nullFirst": false
            }
          ],
          "type": "WindowSpec"
        },
        "type": "WindowFunction"
      },
      "type": "Target"
    }
  ],
  "child": {
    "relations": [
      {
        "tableName": "sum_example",
        "type": "Relation"
      }
    ],
    "type": "RelationList"
  },
  "type": "Projection"
}