R - readRDS() & load() fail to give identical data.tables as the original

Question

Background

I tried to replace some CSV output files with rds files to improve efficiency. These are intermediate files that wi

Answer 1

Probably, this has to do with pointers:

 attributes(aDT)
$names
[1] "a" "b"

$row.names
 [1]  1  2  3  4  5  6  7  8  9 10

$class
[1] "data.table" "data.frame"

$.internal.selfref


> attributes(bDT)
$names
[1] "a" "b"

$row.names
 [1]  1  2  3  4  5  6  7  8  9 10

$class
[1] "data.table" "data.frame"

$.internal.selfref


> attributes(bDF)
$names
[1] "a" "b"

$row.names
 [1]  1  2  3  4  5  6  7  8  9 10

$class
[1] "data.frame"

> attributes(aDF)
$names
[1] "a" "b"

$row.names
 [1]  1  2  3  4  5  6  7  8  9 10

$class
[1] "data.frame"

You can closely look at what's going using .Internal(inspect(.)) command:

.Internal(inspect(aDT))

 .Internal(inspect(bDT))