Merge pull request #7760 from dataease/pr@dev-v2@refactor_sql

refactor: 增加SQL片段预览执行SQL查看

core/core-backend/src/main/java/io/dataease/dataset/manage/DatasetDataManage.java

@@ -311,6 +311,7 @@ public class DatasetDataManage {
         Map<String, Object> previewData = buildPreviewData(data, fields, new HashMap<>());
         Map<String, Object> map = new LinkedHashMap<>();
         map.put("data", previewData);
+        map.put("sql", Base64.getEncoder().encodeToString(sql.getBytes()));
         return map;
     }