robin-sparkless 4.4.0

PySpark-like DataFrame API in Rust on Polars; no JVM.
Documentation 
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{
  "test_id": "summary",
  "pyspark_version": "3.5",
  "generated_at": "2025-10-27T14:26:14.955365",
  "input_data": [
    {
      "id": 1,
      "name": "Alice",
      "age": 25,
      "salary": 50000.0,
      "department": "IT"
    },
    {
      "id": 2,
      "name": "Bob",
      "age": 30,
      "salary": 60000.0,
      "department": "HR"
    },
    {
      "id": 3,
      "name": "Charlie",
      "age": 35,
      "salary": 70000.0,
      "department": "IT"
    },
    {
      "id": 4,
      "name": "David",
      "age": 40,
      "salary": 80000.0,
      "department": "Finance"
    }
  ],
  "operation": "DataFrame operation: summary",
  "expected_output": {
    "schema": {
      "field_count": 6,
      "field_names": [
        "summary",
        "age",
        "department",
        "id",
        "name",
        "salary"
      ],
      "field_types": [
        "string",
        "string",
        "string",
        "string",
        "string",
        "string"
      ],
      "fields": [
        {
          "name": "summary",
          "type": "string",
          "nullable": true
        },
        {
          "name": "age",
          "type": "string",
          "nullable": true
        },
        {
          "name": "department",
          "type": "string",
          "nullable": true
        },
        {
          "name": "id",
          "type": "string",
          "nullable": true
        },
        {
          "name": "name",
          "type": "string",
          "nullable": true
        },
        {
          "name": "salary",
          "type": "string",
          "nullable": true
        }
      ]
    },
    "data": [
      {
        "summary": "count",
        "age": "4",
        "department": "4",
        "id": "4",
        "name": "4",
        "salary": "4"
      },
      {
        "summary": "mean",
        "age": "32.5",
        "department": null,
        "id": "2.5",
        "name": null,
        "salary": "65000.0"
      },
      {
        "summary": "stddev",
        "age": "6.454972243679028",
        "department": null,
        "id": "1.2909944487358056",
        "name": null,
        "salary": "12909.944487358056"
      },
      {
        "summary": "min",
        "age": "25",
        "department": "Finance",
        "id": "1",
        "name": "Alice",
        "salary": "50000.0"
      },
      {
        "summary": "25%",
        "age": "25",
        "department": null,
        "id": "1",
        "name": null,
        "salary": "50000.0"
      },
      {
        "summary": "50%",
        "age": "30",
        "department": null,
        "id": "2",
        "name": null,
        "salary": "60000.0"
      },
      {
        "summary": "75%",
        "age": "35",
        "department": null,
        "id": "3",
        "name": null,
        "salary": "70000.0"
      },
      {
        "summary": "max",
        "age": "40",
        "department": "IT",
        "id": "4",
        "name": "David",
        "salary": "80000.0"
      }
    ],
    "row_count": 8
  }
}