robin-sparkless 4.4.0

PySpark-like DataFrame API in Rust on Polars; no JVM.
Documentation 
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{
  "test_id": "map_keys",
  "pyspark_version": "3.5",
  "generated_at": "2025-10-27T14:13:24.823198",
  "input_data": [
    {
      "id": 1,
      "map1": {
        "a": 1,
        "b": 2
      },
      "map2": {
        "c": 3,
        "d": 4
      },
      "key": "a"
    },
    {
      "id": 2,
      "map1": {
        "x": 10,
        "y": 20
      },
      "map2": {
        "z": 30
      },
      "key": "x"
    },
    {
      "id": 3,
      "map1": {
        "p": 100,
        "q": 200
      },
      "map2": {
        "r": 300
      },
      "key": "p"
    }
  ],
  "operation": "DataFrame operation: map_keys",
  "expected_output": {
    "schema": {
      "field_count": 1,
      "field_names": [
        "map_keys(map1)"
      ],
      "field_types": [
        "array"
      ],
      "fields": [
        {
          "name": "map_keys(map1)",
          "type": "array",
          "nullable": true
        }
      ]
    },
    "data": [
      {
        "map_keys(map1)": [
          "a",
          "b"
        ]
      },
      {
        "map_keys(map1)": [
          "x",
          "y"
        ]
      },
      {
        "map_keys(map1)": [
          "p",
          "q"
        ]
      }
    ],
    "row_count": 3
  }
}