Session lastUsed parameter not updated correctly for a Transaction

[asthamohta]

Each pooled session has a parameter lastUsed which indicates the timestamp when the session was last used. If we make successive RPC calls within a transaction, this parameter only gets updated at the start of the transaction (when we begin transaction) and does not get updated with subsequent RPC calls. This is becuase this time is set when a session is assigned to a transaction.

    database.getSnapshot(async (err, transaction) => {
    const queryOne = 'SELECT SingerId, AlbumId, AlbumTitle FROM Albums';

    try {
      // first RPC
      const [qOneRows] = await transaction.run(queryOne);

      const queryTwo = {
        columns: ['SingerId', 'AlbumId', 'AlbumTitle'],
      };

      // second RPC
      const [qTwoRows] = await transaction.read('Albums', queryTwo);
    } catch (err) {
      console.error('ERROR:', err);
    } 

Bug : In the above example we would expect the timestamp to get updated for each query but is only updated before the first RPC.