(fix):remove parantheses in generated sql (#532)

chat/core/src/main/java/com/tencent/supersonic/chat/parser/sql/llm/SqlPromptGenerator.java

@@ -57,7 +57,7 @@ public class SqlPromptGenerator {
         String instruction = "# Use the the schema links to generate the SQL queries for each of the questions.";
         List<String> exampleKeys = Arrays.asList("questionAugmented", "dbSchema", "generatedSchemaLinkings", "sql");
         String exampleTemplate = "dbSchema\nQ: questionAugmented\n" + "Schema_links: generatedSchemaLinkings\n"
-                + "SQL: {sql}";
+                + "SQL: sql";
 
         String schemaLinkingPrompt = InputFormat.format(exampleTemplate, exampleKeys, fewshotExampleList);
         Pair<String, String> questionPrompt = transformQuestionPrompt(llmReq);