plugins/kotlin-dataframe/testData/box/splitWithTransformIntoRows.kt

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

fun box(): String {
    val df = dataFrameOf("timestamps" to columnOf(listOf(100, 113, 140), listOf(400, 410, 453)))
    val df1 = df.split { timestamps }.by { it.map { it.toString() } }.intoRows()
    val timestamps: DataColumn<String> = df1.timestamps
    timestamps.print()


    val df2 = dataFrameOf("a", "b")(listOf(100, 113, 140), listOf(400, 410))
    val df3 = df2.split { a and b }.by { it.map { it.toString() } }.intoRows()
    // exploding multiple columns will introduce nulls
    df3.print()
    // plugin needs to play safe and make both selected columns nullable
    df3.compileTimeSchema().columns.let {
        assert(it["a"]!!.nullable)
        assert(it["b"]!!.nullable)
    }
    // compile time schema is still compatible with runtime
    df3.compareSchemas()
    return "OK"
}