R Under development (unstable) (2023-08-09 r84924 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> # Create 'stars' object
> set.seed(1331)
> suppressPackageStartupMessages(library(stars))
> volcano = rbind(volcano, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA) # add NA rows
> d = st_dimensions(x = 1:ncol(volcano), y = 1:nrow(volcano))
> (r = st_as_stars(t(volcano)))
stars object with 2 dimensions and 1 attribute
attribute(s):
    Min. 1st Qu. Median     Mean 3rd Qu. Max. NA's
A1    94     108    124 130.1879     150  195  732
dimension(s):
   from to offset delta point x/y
X1    1 61      0     1 FALSE [x]
X2    1 99      0     1 FALSE [y]
> r = st_set_dimensions(r, 1, offset = 0, delta = 1)
> r = st_set_dimensions(r, 2, offset = nrow(volcano), delta = -1)
> 
> # Create points
> pnt = st_sample(st_as_sfc(st_bbox(r)), 100)
> pnt = st_as_sf(pnt)
> 
> # Extract - 'st_join'
> x = st_join(pnt, st_as_sf(r))
> 
> # Extract - 'st_extract'
> y = st_extract(r, pnt)
> 
> # check there are NA's:
> any(is.na(x))
[1] TRUE
> # Compare
> all.equal(x$A1, y[[1]])
[1] TRUE
> 
> ################################################
> if (FALSE) {
+ 
+ ## tic: segfaults
+ # check equal results with stars_proxy:
+ #x = st_extract(stars:::st_as_stars_proxy(r), pnt)
+ #all.equal(x$A1, y[[1]])
+ #all.equal(x, y)
+ 
+ r = c(r, 2*r, 10*r)
+ x = st_join(pnt, st_as_sf(r))
+ y = st_as_sf(st_extract(r, pnt))
+ all.equal(x, y)
+ 
+ ## tic: segfaults
+ #x = st_extract(stars:::st_as_stars_proxy(merge(r)), pnt)
+ #all.equal(st_as_sf(x), y)
+ 
+ tif = system.file("tif/L7_ETMs.tif", package = "stars")
+ xp = read_stars(tif, proxy = TRUE)
+ xm = read_stars(tif, proxy = FALSE)
+ pts = st_sample(st_as_sfc(st_bbox(xp)), 10)
+ pts = c(pts, st_as_sfc("POINT(0 0)"), pts)
+ em = st_extract(xm, pts)
+ if (utils::packageVersion("sf") >= "0.9-7") {
+ 	ep = st_extract(xp, pts)
+ 	print(all.equal(ep, em, check.attributes = TRUE))
+ }
+ 
+ # two-attribute objects:
+ library(stars)
+ tif = system.file("tif/L7_ETMs.tif", package = "stars")
+ xp = read_stars(c(tif, tif), proxy = TRUE)
+ xm = read_stars(c(tif, tif), proxy = FALSE)
+ pts = st_sample(st_as_sfc(st_bbox(xp)), 10)
+ pts = c(pts, st_as_sfc("POINT(0 0)"), pts)
+ em = st_extract(xm, pts)
+ if (utils::packageVersion("sf") >= "0.9-7") {
+ 	ep = st_extract(xp, pts)
+ 	print(all.equal(ep, em, check.attributes = TRUE))
+ }
+ 
+ # single-attribute, single raster objects:
+ tif1 = paste0(tempfile(), ".tif")
+ write_stars(xm[1,,,1], "x.tif")
+ xp = read_stars("x.tif", proxy = TRUE)
+ xm = read_stars("x.tif", proxy = FALSE)
+ em = st_extract(xm, pts)
+ if (utils::packageVersion("sf") >= "0.9-7") {
+ 	ep = st_extract(xp, pts)
+ 	print(all.equal(ep, em, check.attributes = TRUE))
+ }
+ 
+ # multiple-file attributes:
+ x = c(
+   "avhrr-only-v2.19810901.nc",
+   "avhrr-only-v2.19810902.nc",
+   "avhrr-only-v2.19810903.nc",
+   "avhrr-only-v2.19810904.nc",
+   "avhrr-only-v2.19810905.nc",
+   "avhrr-only-v2.19810906.nc",
+   "avhrr-only-v2.19810907.nc",
+   "avhrr-only-v2.19810908.nc",
+   "avhrr-only-v2.19810909.nc"
+ )
+ file_list = system.file(paste0("netcdf/", x), package = "starsdata")
+ if (!identical(file_list, "")) {
+   y = read_stars(file_list, quiet = TRUE)
+   print(y)
+   st_crs(y) = "OGC:CRS84"
+   pts = st_sample(st_as_sfc(st_bbox(y)), 10)
+   em = st_extract(y, pts)
+ 
+   (y = read_stars(file_list, quiet = TRUE, proxy = TRUE))
+   print(y)
+   st_crs(y) = "OGC:CRS84"
+   if (utils::packageVersion("sf") >= "0.9-7") {
+ 	  ep = st_extract(y, pts)
+ 	  print(all.equal(em, ep))
+   }
+ }
+ 
+ # nearest & bilinear comparison:
+ if (utils::packageVersion("sf") >= "0.9-7") {
+   set.seed(12331)
+   s = st_as_stars(matrix(rnorm(16), 4))
+   pts = st_sample(st_as_sfc(st_bbox(s)), 10000, type = "regular")
+   s1 = st_extract(s, pts, bilinear = FALSE)
+   s2 = st_extract(s, pts, bilinear = TRUE)
+   s1$s2 = s2[[1]]
+   names(s1)[c(1,3)] = c("nearest", "bilinear")
+   print(s1[sample(10000, 5),])
+ }
+ }
> 
> proc.time()
   user  system elapsed 
   0.85    0.15    1.01