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

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

interface MyEmptyDeclaration

class MyEmptyDeclarationImpl : MyEmptyDeclaration

class Test(
    val name: String,
    val containingDeclaration: MyEmptyDeclaration
)

fun box(): String {
    val row = dataFrameOf("col" to columnOf(123)).first()
    val df = dataFrameOf(
        "name" to columnOf("A"),
        "containingDeclaration" to columnOf<AnyRow>(row)
    )
    val df1 = df.remove { name }
    val group: ColumnGroup<*> = df1.containingDeclaration
    df1.compileTimeSchema().print()
    df1.schema().print()
    df1.compareSchemas(strict = false)
    return "OK"
}