[ARROW-7662] [R] Support creating ListArray from R list

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.17.0
• Component/s: R
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/23908
• Assignee: Francois Saint-Jacques
• Reporter: Michael Chirico
• Created: 23/Jan/20 11:28
• Updated: 11/Jan/23 07:55
• Resolved: 09/Feb/20 16:59

Description

DF = data.frame(a = 1:10)
DF$b = as.list(DF$a)
arrow::write_parquet(DF, 'test.parquet')
# Error in Table__from_dots(dots, schema) : cannot infer type from data

This appears to be supported naturally already in Python:

import pandas as pd
pd.DataFrame({'a': [1, 2, 3], 'b': [[1, 2], [3, 4], [5, 6]]}).to_parquet('test.parquet')

Issue Links

• relates to: ARROW-7798 [R] Refactor R <-> Array conversion
• links to: GitHub Pull Request #6275