[ARROW-13661] [R] Objects Written to Feather Not Restored Exactly

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 5.0.0
• Component/s: R
• Labels: arrow feather
• Environment: R4.1.1, Ubuntu 20.04
• External issue URL: https://github.com/apache/arrow/issues/29298

Language

English

• Assignee: Unassigned
• Reporter: Charlie Gao
• Created: 18/Aug/21 14:28
• Updated: 11/Jan/23 08:34

Description

Rather simple - write the standard 'iris' dataset to feather, then read it back.

At first glance everything looks the same, but setting 'attrib.as.set = FALSE' to identical() will return FALSE.

Using Waldo to compare, you can see that the order of attributes is different on the restored object. "class" should be the second attribute after "names" but before "row.names".

This should be a simple fix to the 'read_feather' function to set the correct order of attributes.

—

iris <- iris
arrow::write_feather(iris, file <- tempfile())
iris2 <- arrow::read_feather(file)
unlink(file)
identical(iris, iris2)
#> [1] TRUE
identical(iris, iris2, attrib.as.set = FALSE)
#> [1] FALSE
waldo::compare(attributes(iris), attributes(iris2))
#> `names(old)`: "names" "class" "row.names"
#> `names(new)`: "names" "row.names" "class"