Apache Arrow
Kotlin DataFrame supports reading from and writing to Apache Arrow files.
Requires the dataframe-arrow module, which is included by default in the general dataframe artifact and in %use dataframe for Kotlin Notebook.
Read
DataFrame supports both the Arrow interprocess streaming format and the Arrow random access format.
You can read a DataFrame from Apache Arrow data sources (via a file path, URL, or stream) using the readArrowFeather() method:
val df = DataFrame.readArrowFeather("example.feather")
val df = DataFrame.readArrowFeather("https://kotlin.github.io/dataframe/resources/example.feather")
Write
A DataFrame can be written to Arrow format using the interprocess streaming or random access format. Output targets include WritableByteChannel, OutputStream, File, or ByteArray.
See Writing to Apache Arrow formats for more details.
22 August 2025