AdamGS commented on code in PR #334:
URL: 
https://github.com/apache/arrow-rs-object-store/pull/334#discussion_r2046482455


##########
src/client/builder.rs:
##########
@@ -252,12 +252,18 @@ where
 
     let mut out = match parts.path_and_query {
         Some(p) => match p.query() {
-            Some(x) => format!("{}?{}", p.path(), x),
+            Some(query) => format!("{}?{}", p.path(), query),
             None => format!("{}?", p.path()),
         },
         None => "/?".to_string(),
     };
-    let mut serializer = form_urlencoded::Serializer::new(&mut out);
+    let mut serializer = if out.ends_with('?') {
+        let start_position = out.len();
+        form_urlencoded::Serializer::for_suffix(&mut out, start_position)
+    } else {
+        form_urlencoded::Serializer::new(&mut out)
+    };

Review Comment:
   This code path had the same kind of "bug", modified the relevant test to 
catch it.



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