[ARROW-10623] [R] Version 1.0.1 breaks data.frame attributes when reading file written by 2.0.0

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0.1, 2.0.0
• Fix Version/s: 3.0.0
• Component/s: R
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/26579
• Assignee: Jonathan Keane
• Reporter: Fleur Kelpin
• Created: 16/Nov/20 20:40
• Updated: 11/Jan/23 08:14
• Resolved: 11/Jan/21 19:32

Description

How to reproduce

• Create a data frame:

  df <- data.frame(col1 = 1:100)

• Write it to parquet file using apache 2.0.0. The demo uses R 3.6 but same happens if you use R 4.0
• Read the parquet file using apache 1.0.1. I only tried that in R 3.6

Expected

The data frame is the same as it was before:

structure(list(col1 = 1:100), row.names = c(NA, 100L), class = "data.frame")

Actual

The data frame has lost some information:

structure(list(1:100), class = "data.frame")

Demo

I'm not sure what the easiest way is to put up a demo project for this, since you need to switch between arrow installations. But I've created this docker based demo:

https://github.com/fdlk/arrow2/

Issue Links

• links to: GitHub Pull Request #9107
• links to: GitHub Pull Request #9118