robin-sparkless 4.4.0

PySpark-like DataFrame API in Rust on Polars; no JVM.
Documentation 
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{
  "test_id": "string_substring",
  "pyspark_version": "3.5",
  "generated_at": "2025-10-27T14:13:11.929439",
  "input_data": [
    {
      "id": 1,
      "name": "Alice",
      "age": 25,
      "salary": 50000.0,
      "active": true,
      "email": "alice@example.com"
    },
    {
      "id": 2,
      "name": "Bob",
      "age": 30,
      "salary": 60000.0,
      "active": false,
      "email": "bob@test.com"
    },
    {
      "id": 3,
      "name": "Charlie",
      "age": 35,
      "salary": 70000.0,
      "active": true,
      "email": "charlie@company.org"
    }
  ],
  "operation": "DataFrame operation: string_substring",
  "expected_output": {
    "schema": {
      "field_count": 1,
      "field_names": [
        "substring(name, 1, 3)"
      ],
      "field_types": [
        "string"
      ],
      "fields": [
        {
          "name": "substring(name, 1, 3)",
          "type": "string",
          "nullable": true
        }
      ]
    },
    "data": [
      {
        "substring(name, 1, 3)": "Ali"
      },
      {
        "substring(name, 1, 3)": "Bob"
      },
      {
        "substring(name, 1, 3)": "Cha"
      }
    ],
    "row_count": 3
  }
}