SQL: clear the cursor if nested inner hits are enough to fulfill the query required limits

x-pack/plugin/sql/qa/single-node/src/test/java/org/elasticsearch/xpack/sql/qa/single_node/JdbcCsvSpecIT.java

@@ -8,25 +8,18 @@
 import org.elasticsearch.xpack.sql.qa.jdbc.CsvSpecTestCase;
 import org.elasticsearch.xpack.sql.qa.jdbc.CsvTestUtils.CsvTestCase;
 
-import java.sql.Connection;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-import java.sql.Statement;
-
 public class JdbcCsvSpecIT extends CsvSpecTestCase {
     public JdbcCsvSpecIT(String fileName, String groupName, String testName, Integer lineNumber, CsvTestCase testCase) {
         super(fileName, groupName, testName, lineNumber, testCase);
     }
 
     @Override
-    protected ResultSet executeJdbcQuery(Connection con, String query) throws SQLException {
+    protected int fetchSize() {
         // using a smaller fetchSize for nested documents' tests to uncover bugs
         // similar with https://github.com/elastic/elasticsearch/issues/35176 quicker
         if (fileName.startsWith("nested")) {
-            Statement statement = con.createStatement();
-            statement.setFetchSize(randomBoolean() ? fetchSize() : randomIntBetween(1, 5));
-            return statement.executeQuery(query);
+            return randomBoolean() ? super.fetchSize() : randomIntBetween(1, 5);
         }
-        return super.executeJdbcQuery(con, query);
+        return super.fetchSize();
     }
 }

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/execution/search/SearchHitRowSet.java

@@ -90,7 +90,7 @@ class SearchHitRowSet extends AbstractRowSet {
         }
     }
 
-    public boolean isLimitReached() {
+    protected boolean isLimitReached() {
         return cursor == Cursor.EMPTY;
     }