conflict handling for COPY FROM

When Who What
2019-06-28 11:00:44 Surafel Temesgen (surafel) Closed in commitfest 2019-03 with status: Returned with feedback
2019-06-28 10:58:16 Surafel Temesgen (surafel) New status: Needs review
2019-04-03 20:04:17 Andres Freund (andresfreund) Closed in commitfest 2019-03 with status: Returned with feedback
2019-03-25 08:48:21 David Steele (dsteele) New status: Waiting on Author
2019-02-19 11:37:27 Surafel Temesgen (surafel) New status: Needs review
2019-02-04 06:06:45 Michael Paquier (michael-kun) New status: Waiting on Author
2019-02-04 06:06:40 Michael Paquier (michael-kun) Closed in commitfest 2019-01 with status: Moved to next CF
2018-12-19 12:05:55 Surafel Temesgen (surafel) New status: Needs review
2018-11-29 12:15:23 Dmitry Dolgov (erthalion) New status: Waiting on Author
2018-11-29 12:15:02 Dmitry Dolgov (erthalion) Closed in commitfest 2018-11 with status: Moved to next CF
2018-10-02 06:45:01 Michael Paquier (michael-kun) Closed in commitfest 2018-09 with status: Moved to next CF
2018-08-20 06:37:05 Surafel Temesgen (surafel) Posted comment with messageid <153474702574.1410.1544274037026819695.pgcf@coridan.postgresql.org>
2018-08-18 05:17:20 Karen Huddleston (khuddlefish) Posted comment with messageid <153456944015.1410.12495599902221553748.pgcf@coridan.postgresql.org>
2018-08-16 04:05:17 Andrew McElroy (andrew.mcelroy.punchh.com) Added andrew.mcelroy.punchh.com as reviewer
2018-08-16 02:31:09 Karen Huddleston (khuddlefish) Added khuddlefish as reviewer
2018-08-04 13:14:17 Surafel Temesgen (surafel) Changed authors to Surafel Temesgen (surafel)
2018-08-04 13:12:16 Surafel Temesgen (surafel) Attached mail thread CALAY4q8PcAcTUVgjvKkNxenoAcydiwUuYhwNwad4kcZQ9Ewdbw@mail.gmail.com
2018-08-04 13:12:16 Surafel Temesgen (surafel) Created patch record