nit

Author: Neenu1995

java-bigquery/google-cloud-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryJsonResultSet.java

@@ -197,6 +197,7 @@ private boolean nextImpl() throws SQLException {
 
   @Override
   public Object getObject(int columnIndex) throws SQLException {
+    // columnIndex is SQL index starting at 1
     checkClosed();
     try {
       return getObjectImpl(columnIndex);