yuxiqian commented on code in PR #4261:
URL: https://github.com/apache/flink-cdc/pull/4261#discussion_r2772135771


##########
flink-cdc-runtime/src/main/java/org/apache/flink/cdc/runtime/parser/JaninoCompiler.java:
##########
@@ -174,7 +174,10 @@ private static Java.Rvalue translateSqlSqlLiteral(Context 
context, SqlLiteral sq
         Object value = sqlLiteral.getValue();
         if (sqlLiteral instanceof SqlCharStringLiteral) {
             // Double quotation marks represent strings in Janino.
-            value = "\"" + sqlLiteral.getValueAs(NlsString.class).getValue() + 
"\"";
+            // Escape backslashes first, then double quotes for proper Janino 
string literals.
+            String stringValue = 
sqlLiteral.getValueAs(NlsString.class).getValue();
+            stringValue = stringValue.replace("\\", "\\\\").replace("\"", 
"\\\"");
+            value = "\"" + stringValue + "\"";

Review Comment:
   Nice catch! I confirmed the implementation is the same as Apache common's 
`StringEscapeUtils#escapeJava`.
   
   <img width="1097" height="125" alt="Image" 
src="https://github.com/user-attachments/assets/86cb20c9-4c53-46b3-b4d5-f6b87174e132";
 />



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