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Comments (2)

nikitinas avatar nikitinas commented on July 30, 2024

Better design.

DataFrame API:

interface DataRowSchema

inline fun <reified T:DataRowSchema> dataFrameOf(vararg rows: T): DataFrame<T> = rows.asIterable().toDataFrame()

inline fun <reified T:DataRowSchema> DataFrame<T>.append(vararg rows: T): DataFrame<T> = concat(dataFrameOf(*rows))

User code:

@DataSchema
interface Record: DataRowSchema {
    val a: Int
    val b: Int

    companion object
}

// region Generated code

operator fun Record.Companion.invoke(a: Int, b: Int): Record =
    object: Record {
        override val a = a
        override val b = b
    }

// endregion

// usage:

dataFrameOf(Record(1,2), Record(3,4))
  .append(Record(5,6))
  .add("sum") { a + b }

from dataframe.

koperagen avatar koperagen commented on July 30, 2024

Can we somehow get rid of DataRowSchema?
In FIR, it's possible to add supertypes to annotated class, so at least it can disappear from user code.

And here is another example to be aware of

// User code:
@DataSchema
interface AnotherRecord: DataRowSchema {
    val a: Int
    val b: Int

    companion object
}

@DataSchema
interface Record: DataRowSchema {
    val a: List<AnotherRecord> // same as DataFrame<AnotherRecord>
    val b: AnotherRecord // same as DataRow<AnotherRecord>

    companion object
}

// usage:
dataFrameOf(Record(listOf(AnotherRecord(5,6)), AnotherRecord(5,6)))

from dataframe.

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