(improvement)(chat) support nested query sql (#210)

common/src/main/java/com/tencent/supersonic/common/util/jsqlparser/SqlParserSelectHelper.java

@@ -139,8 +139,16 @@ public class SqlParserSelectHelper {
     }
 
     public static List<String> getAllFields(String sql) {
+        List<PlainSelect> plainSelects = getPlainSelects(getPlainSelect(sql));
+        Set<String> results = new HashSet<>();
+        for (PlainSelect plainSelect : plainSelects) {
+            List<String> fields = getFieldsByPlainSelect(plainSelect);
+            results.addAll(fields);
+        }
+        return new ArrayList<>(results);
+    }
 
-        PlainSelect plainSelect = getPlainSelect(sql);
+    private static ArrayList<String> getFieldsByPlainSelect(PlainSelect plainSelect) {
         if (Objects.isNull(plainSelect)) {
             return new ArrayList<>();
         }

common/src/test/java/com/tencent/supersonic/common/util/jsqlparser/SqlParserSelectHelperTest.java

@@ -126,6 +126,13 @@ class SqlParserSelectHelperTest {
                         + "= '2023-08-08' ORDER BY pv DESC LIMIT 1");
 
         Assert.assertEquals(allFields.size(), 6);
+
+        allFields = SqlParserSelectHelper.getAllFields(
+                "SELECT * FROM CSpider  WHERE (评分 < (SELECT min(评分) FROM CSpider WHERE 语种 = '英文' ))"
+                        + " AND 数据日期 = '2023-10-12'");
+
+        Assert.assertEquals(allFields.size(), 3);
+
     }