rok commented on code in PR #46180:
URL: https://github.com/apache/arrow/pull/46180#discussion_r2054083538


##########
docs/source/cpp/arrays.rst:
##########
@@ -223,3 +227,53 @@ to some logical subsequence of the data.  This is done by 
calling the
 :func:`arrow::Array::Slice` and :func:`arrow::ChunkedArray::Slice` methods,
 respectively.
 
+.. _fromjson_helpers:
+
+FromJSON Helpers
+================
+
+A set of helper functions is provided for concisely creating Arrays and Scalars
+from JSON_ text. These helpers are intended to be used in examples, tests, or
+for quick prototyping and are not intended to be used where performance 
matters.

Review Comment:
   Perhaps add a comment here that Arrow has a performant JSON reader that 
should be used in performance-sensitive cases? Perhaps adding a link too: 
https://arrow.apache.org/docs/cpp/json.html



##########
cpp/src/arrow/c/bridge_test.cc:
##########
@@ -1004,15 +1006,16 @@ TEST_F(TestArrayExport, List) {
 TEST_F(TestArrayExport, ListSliced) {
   {
     auto factory = []() {
-      return ArrayFromJSON(list(int8()), "[[1, 2], [3, null], [4, 5, 6], 
null]")
+      return arrow::ArrayFromJSON(list(int8()), "[[1, 2], [3, null], [4, 5, 
6], null]")

Review Comment:
   Adding a `using` would be nicer here, e.g.:
   ```cpp
   using arrow::ArrayFromJSON;
   ```



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