plan.json

{
    "relations": [
        {
            "root": {
                "input": {
                    "project": {
                        "input": {
                            "read": {
                                "baseSchema": {
                                    "names": [
                                        "species",
                                        "island",
                                        "bill_length_mm",
                                        "bill_depth_mm",
                                        "flipper_length_mm",
                                        "body_mass_g",
                                        "sex",
                                        "year"
                                    ],
                                    "struct": {
                                        "types": [
                                            {
                                                "string": {
                                                    "nullability": "NULLABILITY_NULLABLE"
                                                }
                                            },
                                            {
                                                "string": {
                                                    "nullability": "NULLABILITY_NULLABLE"
                                                }
                                            },
                                            {
                                                "fp64": {
                                                    "nullability": "NULLABILITY_NULLABLE"
                                                }
                                            },
                                            {
                                                "fp64": {
                                                    "nullability": "NULLABILITY_NULLABLE"
                                                }
                                            },
                                            {
                                                "i32": {
                                                    "nullability": "NULLABILITY_NULLABLE"
                                                }
                                            },
                                            {
                                                "i32": {
                                                    "nullability": "NULLABILITY_NULLABLE"
                                                }
                                            },
                                            {
                                                "string": {
                                                    "nullability": "NULLABILITY_NULLABLE"
                                                }
                                            },
                                            {
                                                "i32": {
                                                    "nullability": "NULLABILITY_NULLABLE"
                                                }
                                            }
                                        ],
                                        "nullability": "NULLABILITY_REQUIRED"
                                    }
                                },
                                "projection": {
                                    "select": {
                                        "structItems": [
                                            {
                                                "field": 0
                                            }
                                        ]
                                    },
                                    "maintainSingularStruct": true
                                },
                                "namedTable": {
                                    "names": [
                                        "penguins"
                                    ]
                                }
                            }
                        },
                        "expressions": [
                            {
                                "selection": {
                                    "directReference": {
                                        "structField": {}
                                    },
                                    "rootReference": {}
                                }
                            }
                        ]
                    }
                },
                "names": [
                    "island"
                ]
            }
        }
    ],
    "version": {
        "minorNumber": 53,
        "producer": "DuckDB"
    }
}