import org.jetbrains.kotlinx.dataframe.*
import org.jetbrains.kotlinx.dataframe.annotations.*
import org.jetbrains.kotlinx.dataframe.api.*
import org.jetbrains.kotlinx.dataframe.api.toDataFrame
import org.jetbrains.kotlinx.dataframe.io.*

data class Name(val firstName: String, val lastName: String)

data class Score(val subject: String, val value: Int)

data class Student(val name: Name, val age: Int, val scores: List<Score>)

fun box(): String {
    val students = listOf(
        Student(Name("Alice", "Cooper"), 15, listOf(Score("math", 4), Score("biology", 3))),
        Student(Name("Bob", "Marley"), 20, listOf(Score("music", 5))),
    )

    val df = students.toDataFrame().groupBy { expr { name.firstName} }
        .aggregate {
            remove { age } into "a"
        }

    df.compareSchemas(strict = true)
    return "OK"
}