Incremental insert from Oracle

[One4EV3r]

Hi,
I think i have found bug, or i have been using flume ng sql wrong way.
Ive tested flume ng sql for streaming update from Oracle table. Tracking column was timestamp, incremental. It was used on 2 modes: custom query, and on scaning jsut one table, by providing incremental column name and table name.
Streaming doesnt work, it simply goes into error. Ive lost a lot of time to make it working but unsuccesfully. eventually, I found out, that it works on versions <=1.5.0, on later ones ther is this bug present.
Flume ng sql - 1.5.2
Flume 1.8
Attached agent config file, and debug log with error.
flume_debug_timestamp.log
flume.txt