goutamadwant commented on code in PR #19202:
URL: https://github.com/apache/pinot/pull/19202#discussion_r3763798851


##########
pinot-spi/src/main/java/org/apache/pinot/spi/config/ConfigUtils.java:
##########
@@ -92,6 +93,9 @@ private static JsonNode 
applyConfigWithEnvVariablesAndSystemProperties(Map<Strin
         break;
       case STRING:
         final String field = jsonNode.asText();
+        if (field.startsWith("$${") && field.endsWith("}")) {
+          return JsonNodeFactory.instance.textNode(field.substring(1));

Review Comment:
   Documented in the companion docs branch at 63ca1f2e97. The escape is now 
explicitly described as whole-value only and non-recursive/non-composable. 
Embedded provider-shaped substrings do not have a literal escape.



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