[
  {
    "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": "__table1.number",
              "Type": "UInt64"
            },
            {
              "Name": "quantile(0.2_Float64)(__table1.number)",
              "Type": "Float64"
            },
            {
              "Name": "sumIf(__table1.number, greater(__table1.number, 0_UInt8))",
              "Type": "UInt64"
            }
          ],
          "Keys": ["__table1.number"],
          "Aggregates": [
            {
              "Name": "quantile(0.2_Float64)(__table1.number)",
              "Function": {
                "Name": "quantile",
                "Parameters": ["0.2"],
                "Argument Types": ["UInt64"],
                "Result Type": "Float64"
              },
              "Arguments": ["__table1.number"]
            },
            {
              "Name": "sumIf(__table1.number, greater(__table1.number, 0_UInt8))",
              "Function": {
                "Name": "sumIf",
                "Argument Types": ["UInt64", "UInt8"],
                "Result Type": "UInt64"
              },
              "Arguments": ["__table1.number", "greater(__table1.number, 0_UInt8)"]
            }
          ],
--------
          "Node Type": "ArrayJoin",
          "Left": false,
          "Columns": ["__table1.x", "__table1.y"],
--------
          "Node Type": "Distinct",
          "Columns": ["intDiv(__table1.number, 2_UInt8)", "intDiv(__table1.number, 3_UInt8)"],
--
              "Node Type": "Distinct",
              "Columns": ["intDiv(__table1.number, 2_UInt8)", "intDiv(__table1.number, 3_UInt8)"],
--------
              "Sort Description": [
                {
                  "Column": "__table1.number",
                  "Ascending": false,
                  "With Fill": false
                },
                {
                  "Column": "plus(__table1.number, 1_UInt8)",
                  "Ascending": true,
                  "With Fill": false
                }
              ],
              "Limit": 3,