Order properties which are present in class primary constructor

[ileasile]

We cannot infer the properties order in RT for this class:

class A {
    val x: Int
    val b: String
}

But we can do it for this class:

data class B(val x: Int, val b: String)

To achieve this, we may list primary constructor arguments names and map they to properties names:

KClass<*>.primaryConstructor?.parameters?.map { it.name }

[buckler4]

@ileasile - agreed this enhancement would be great for toDataFrameByProperties. Additionally, I couldn't find a simple move method to order all the columns at once.

This works but not very elegant:

    var df= dataFrameRows.toDataFrameByProperties() as DataFrame<BKSamRecord>
    val colList: Array<String> = BKSamRecord::class.primaryConstructor?.parameters?.mapNotNull { it.name }!!.toTypedArray()
    val ordDf=df.move(*colList).toLeft()