Retry JdbcClient::execute method

So far we were doing a retry only when the connection opening had
intermittent failure.

Notice this is a best effort retrying. There is another execute method
in BaseJdbcClient, however it is not a trivial thing to retry on
statement execution there as it is not safe to retry it without opening
a new connection.

Author: kokosing

plugin/trino-base-jdbc/src/main/java/io/trino/plugin/jdbc/RetryingJdbcClient.java

@@ -205,7 +205,8 @@ public Connection getConnection(ConnectorSession session, JdbcSplit split, JdbcP
     @Override
     public void execute(ConnectorSession session, String query)
     {
-        delegate.execute(session, query);
+        // we do a nested retry as opening a connection is already retried, however it is better to retry on intermittent issue than fail
+        retry(policy, () -> delegate.execute(session, query));
     }
 
     @Override