wjones127 commented on a change in pull request #11956:
URL: https://github.com/apache/arrow/pull/11956#discussion_r794653813
##########
File path: r/tests/testthat/test-Array.R
##########
@@ -572,6 +572,29 @@ test_that("Array$create() handles vector -> list arrays
(ARROW-7662)", {
expect_error(Array$create(list(df)))
})
+test_that("Array$create() handles list of dataframes -> map arrays", {
+ # Should be able to create an empty map with a type hint.
+ expect_r6_class(Array$create(list(), type = map_of(utf8(), boolean())),
"MapArray")
+
+ # MapType is alias for List<Struct<keys, values>>
+ data <- list(data.frame(key = c("a", "b"), value = c(1, 2), stringsAsFactors
= FALSE),
+ data.frame(key = c("a", "c"), value = c(4, 7), stringsAsFactors
= FALSE))
+ arr <- Array$create(data, type = map_of(utf8(), int32()))
+
+ expect_r6_class(arr, "MapArray")
+ expect_as_vector(arr, data, ignore_attr = TRUE)
Review comment:
@jonkeane Actually there is a test here, which tests the round trip.
Maps are lists of dataframes with `key` and `value` columns.
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