`disjoint_union()` and vertex attributes

[krlmlr]

Needs same treatment as #761.

options(conflicts.policy = list(warn = FALSE))
library(igraph)

# create two graphs
g1 <- make_graph(~ B - -C, C - -D)
g2 <- make_graph(~ A - -G, E - -F)

# add an edge attribute of class POSIXct to each graph
g1 <- set_vertex_attr(g1, "date", value = as.POSIXct(c("2021-01-01 01:01:01", "2022-02-02 02:02:02", "2023-03-03 03:03:03")))
g2 <- set_vertex_attr(g2, "date", value = as.POSIXct(c("2021-03-03 03:03:03", "2022-04-04 04:04:04", "2023-05-05 05:05:05", "2024-06-06 06:06:06")))

# create the union of the two graphs
u <- disjoint_union(g1, g2)

# now print the structure of g1, g2, and u
vertex_attr(u, "date")
#> [1] 1609459261 1643763722 1677808983 1614736983 1649037844 1683255905 1717646766

^{Created on 2024-12-20 with reprex v2.1.1}

CC @bockthom @maxloeffler.

[bockthom]

I'd suggest to rename this issue, as it actually is about vertex attributes, not edge attributes (edge attributes have been addressed already in #761 and #1587).

[krlmlr]

Good catch, thanks!

[bockthom]

Are there any news on fixing this inconsistency?

Should be easy to fix, as the changes of PR https://github.com/igraph/rigraph/pull/1375 carried out in what now appear to be lines 271-285 of R/operators.R regarding edge attributes just need to be applied to similar code for vertex attributes in the same file a few lines above (now lines 246-254), which had been missed in PR https://github.com/igraph/rigraph/pull/1375.

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[schochastics]

just needs merging https://github.com/igraph/rigraph/pull/1909