K2

[mgroth0]

Is there any branch or PR working on a K2 update? I started working on this and it seems like a heavy task so I'm wondering if anyone else has started.

[koperagen]

We'll update KSP plugin and it should be enough for library users to use dataframe in their K2 builds as a dependency. As for updating to K2 compiler in our project itself, no one has started working on it yet.

[Jolanrensen]

There's also the Jupyter dependency. Atm Jupyter tests don't run if we compile the integration classes with Kotlin 2.0. I hope this will work once it is not in preview anymore, but I'm not sure.

Edit: From Kotlin 2.0.0-RC1 upwards, in theory, Jupyter tests work :)

[Jolanrensen]

It's important to note that DataFrame will likely work fine as a library in your Kotlin 2.0+ project btw, as Kotlin is inherently backwards compatible.

[jsjeon]

I'd like to point out: https://youtrack.jetbrains.com/issue/KT-65676/K2-type-checking-has-run-into-a-recursive-problem-for-property-with-same-name-as-class-on-classpath#focus=Comments-27-9726934.0-0

[Jolanrensen]

A small fix regarding this was merged here.
More fixes are on the way here: #708

[Jolanrensen]

One final thing that currently stops us to update is our outdated linter:
#364
It officially only supports Kotlin up to 1.4 or something... Well it finally broke at 2.0.

[Kantis]

It seems possible to use K2 and Dataframe 0.13 together. Documenting it here in case anyone else is interested in trying it out.

You need to force KSP to a K2 compatible version and apply the KSP gradle plugin yourself.

// in build.gradle.kts
plugins {
   id("org.jetbrains.kotlinx.dataframe") version "0.13.1"
   id("com.google.devtools.ksp") version "2.0.0-1.0.21"
}

// in /settings.gradle.kts
buildscript {
   configurations.all {
      resolutionStrategy {
         force("com.google.devtools.ksp:symbol-processing-api:2.0.0-1.0.21")
         force("com.google.devtools.ksp:symbol-processing-gradle-plugin:2.0.0-1.0.21")
      }
   }
}

Disclaimer: Not sure if this might cause unexpected issues. My builds are passing though.

[Jolanrensen]

@Kantis Nice! You could probably even skip the force() with setting kotlin.dataframe.add.ksp=false, like here.