kou commented on code in PR #47041:
URL: https://github.com/apache/arrow/pull/47041#discussion_r2275248409


##########
cpp/subprojects/rapidjson.wrap:
##########
@@ -16,15 +16,12 @@
 # under the License.
 
 [wrap-file]
-directory = rapidjson-1.1.0
-source_url = https://github.com/Tencent/rapidjson/archive/v1.1.0.tar.gz
-source_filename = rapidjson-1.1.0.tar.gz
-source_hash = bf7ced29704a1e696fbccf2a2b4ea068e7774fa37f6d7dd4039d0787f8bed98e
-patch_filename = rapidjson_1.1.0-2_patch.zip
-patch_url = https://wrapdb.mesonbuild.com/v2/rapidjson_1.1.0-2/get_patch
-patch_hash = c1480d0ecef09dbaa4b4d85d86090205386fb2c7e87f4f158b20dbbda14c9afc
-source_fallback_url = 
https://github.com/mesonbuild/wrapdb/releases/download/rapidjson_1.1.0-2/rapidjson-1.1.0.tar.gz
-wrapdb_version = 1.1.0-2
+directory = rapidjson-232389d4f1012dddec4ef84861face2d2ba85709
+source_url = 
https://github.com/miloyip/rapidjson/archive/232389d4f1012dddec4ef84861face2d2ba85709.tar.gz

Review Comment:
   ```suggestion
   source_url = 
https://github.com/Tencent/rapidjson/archive/232389d4f1012dddec4ef84861face2d2ba85709.tar.gz
   ```



##########
cpp/src/arrow/meson.build:
##########
@@ -293,7 +293,8 @@ if needs_csv
 endif
 
 if needs_json or needs_integration
-    rapidjson_dep = dependency('rapidjson', include_type: 'system')
+    rapidjson_proj = subproject('rapidjson')
+    rapidjson_dep = rapidjson_proj.get_variable('rapidjson_dep')

Review Comment:
   Hmm. I think that most distributions such as Debian, Ubuntu, AlmaLinux and 
conda ships patched RapidJSON. So we can use system RapidJSON in most 
distributions.
   
   I think that it's a problem that the current Meson configuration doesn't 
detect system RapidJSON: 
https://github.com/apache/arrow/pull/47318#issuecomment-3186600418
   
   Anyway, let's use this approach. Because this will be removed sooner or 
later. We'll migrate to simdjson: https://github.com/apache/arrow/issues/35460



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