feat(r): Allow opt-out of warning for unregistered extension types

r/R/convert-array.R

@@ -24,6 +24,10 @@
 #' dispatching on `to`: developers may implement their own S3 methods for
 #' custom vector types.
 #'
+#' Note that unregistered extension types will by default issue a warning.
+#' Use `options(nanoarrow.warn_unregistered_extension = FALSE)` to disable
+#' this behaviour.
+#'
 #' @param array A [nanoarrow_array][as_nanoarrow_array].
 #' @param to A target prototype object describing the type to which `array`
 #'   should be converted, or `NULL` to use the default conversion as

r/R/extension.R

@@ -164,6 +164,12 @@ nanoarrow_extension_array <- function(storage_array, extension_name,
 }
 
 warn_unregistered_extension_type <- function(x) {
+  # Allow an opt-out of this warning for consumers that don't have
+  # control over their source and want to drop unknown extensions
+  if (!getOption("nanoarrow.warn_unregistered_extension", TRUE)) {
+    return()
+  }
+
   # Warn that we're about to ignore an extension type
   if (!is.null(x$name) && !identical(x$name, "")) {
     warning(

r/tests/testthat/test-extension.R

@@ -126,6 +126,20 @@ test_that("as_nanoarrow_array() dispatches on registered extension spec", {
   )
 })
 
+test_that("inferring the type of an unregistered extension warns", {
+  expect_warning(
+    infer_nanoarrow_ptype(na_extension(na_int32(), "definitely not registered")),
+    "Converting unknown extension"
+  )
+
+  previous_opts <- options(nanoarrow.warn_unregistered_extension = FALSE)
+  on.exit(options(previous_opts))
+  expect_warning(
+    infer_nanoarrow_ptype(na_extension(na_int32(), "definitely not registered")),
+    NA
+  )
+})
+
 test_that("extensions can infer a schema of a nanoarrow_vctr() subclass", {
   register_nanoarrow_extension(
     "some_ext",