NobiGo commented on code in PR #3896:
URL: https://github.com/apache/calcite/pull/3896#discussion_r1699959854


##########
mongodb/src/main/java/org/apache/calcite/adapter/mongodb/MongoRules.java:
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@@ -114,10 +114,14 @@ static String quote(String s) {
   }
 
   private static boolean needsQuote(String s) {
-    for (int i = 0, n = s.length(); i < n; i++) {
+    if (!s.isEmpty()

Review Comment:
   The field name can contain '$' ? The new code doesn't cover when '$' is in 
the middle of the field like 'te$st'.



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