[
  {
    "Plan": {
      "Node Type": "Union",
      "Plans": [
        {
          "Node Type": "Expression",
          "Plans": [
            {
              "Node Type": "ReadFromStorage"
            }
          ]
        },
        {
          "Node Type": "Expression",
          "Plans": [
            {
              "Node Type": "ReadFromStorage"
            }
          ]
        }
      ]
    }
  }
]
--------
      "Header": [
        {
          "Name": "1",
          "Type": "UInt8"
        },
        {
          "Name": "plus(2, dummy)",
          "Type": "UInt16"
        }
--------
          "Node Type": "Aggregating",
          "Header": [
            {
              "Name": "number",
              "Type": "UInt64"
            },
            {
              "Name": "plus(number, 1)",
              "Type": "UInt64"
            },
            {
              "Name": "quantile(0.2)(number)",
              "Type": "Float64"
            },
            {
              "Name": "sumIf(number, greater(number, 0))",
              "Type": "UInt64"
            }
          ],
          "Keys": ["number", "plus(number, 1)"],
          "Aggregates": [
            {
              "Name": "quantile(0.2)(number)",
              "Function": {
                "Name": "quantile",
                "Parameters": ["0.2"],
                "Argument Types": ["UInt64"],
                "Result Type": "Float64"
              },
              "Arguments": ["number"]
            },
            {
              "Name": "sumIf(number, greater(number, 0))",
              "Function": {
                "Name": "sumIf",
                "Argument Types": ["UInt64", "UInt8"],
                "Result Type": "UInt64"
              },
              "Arguments": ["number", "greater(number, 0)"]
            }
          ],
--------
          "Node Type": "ArrayJoin",
          "Left": false,
          "Columns": ["x", "y"],
--------
          "Node Type": "Distinct",
          "Columns": ["intDiv(number, 3)", "intDiv(number, 2)"],
--
              "Node Type": "Distinct",
              "Columns": ["intDiv(number, 3)", "intDiv(number, 2)"],
--------
              "Sort Description": [
                {
                  "Column": "number",
                  "Ascending": false,
                  "With Fill": false
                },
                {
                  "Column": "plus(number, 1)",
                  "Ascending": true,
                  "With Fill": false
                }
              ],
              "Limit": 3,