Cleaning up orphaned files using undo logs

    Attachment (v2-0001-New-undo-request-manager-now-with-UndoRequestMana.patch) at 2019-08-21 02:56:35 from Robert Haas <robertmhaas at gmail.com> (Patch: Yes)
    Attachment (undo-20190820.tgz) at 2019-08-20 09:02:18 from Thomas Munro <thomas.munro at gmail.com> (Patch: No)
    Attachment (undo_13_08_2019.tar.gz) at 2019-08-13 04:01:45 from Dilip Kumar <dilipbalaut at gmail.com> (Patch: No)
    Attachment (0001-Move-some-md.c-specific-logic-from-smgr.c-to-md.c.patch) at 2019-08-09 08:21:04 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (0001-Draft-of-new-undo-request-manager.patch) at 2019-08-08 20:27:16 from Robert Haas <robertmhaas at gmail.com> (Patch: Yes)
    Attachment (test_undo_worker_load_balancing.py) at 2019-08-07 11:35:38 from Thomas Munro <thomas.munro at gmail.com> (Patch: No)
    Attachment (0001-Move-some-md.c-specific-logic-from-smgr.c-to-md.c.patch) at 2019-07-31 13:14:00 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (0001-pg_upgrade-failure-fix.patch) at 2019-07-25 11:26:09 from vignesh C <vignesh21 at gmail.com> (Patch: Yes)
    Attachment (undolog_20190716.tar.gz) at 2019-07-16 08:50:11 from Dilip Kumar <dilipbalaut at gmail.com> (Patch: No)
    Attachment (undo_20190709.tar.gz) at 2019-07-09 10:28:22 from Dilip Kumar <dilipbalaut at gmail.com> (Patch: No)
    Attachment (undo_20190706.tar.gz) at 2019-07-06 14:56:29 from Dilip Kumar <dilipbalaut at gmail.com> (Patch: No)
    Attachment (lookahead-failure-chance.pl) at 2019-07-05 20:16:51 from Robert Haas <robertmhaas at gmail.com> (Patch: No)
    Attachment (undo-20190701.tgz) at 2019-07-01 07:53:26 from Thomas Munro <thomas.munro at gmail.com> (Patch: No)
    Attachment (0001-Add-SmgrId-to-smgropen-and-BufferTag.patch) at 2019-06-25 19:59:57 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: No)
    Attachment (0005-Add-prefetch-support-for-the-undo-log.patch) at 2019-06-18 11:30:48 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (undo-20190614.tgz) at 2019-06-14 02:55:52 from Thomas Munro <thomas.munro at gmail.com> (Patch: No)
    Attachment (0001-Extend-binary-heap-functionality.patch) at 2019-05-27 09:58:58 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (0001-Provide-interfaces-to-store-and-fetch-undo-records_v7.patch) at 2019-05-15 14:44:18 from Dilip Kumar <dilipbalaut at gmail.com> (Patch: Yes)
    Attachment (0002-Provide-interfaces-to-store-and-fetch-undo-records_v6.patch) at 2019-05-12 06:15:03 from Dilip Kumar <dilipbalaut at gmail.com> (Patch: Yes)
    Attachment (undo-2019-05-11.tgz) at 2019-05-11 09:49:49 from Thomas Munro <thomas.munro at gmail.com> (Patch: No)
    Attachment (0001-Add-missing-file-in-pg_buffercache.patch) at 2019-05-10 10:46:09 from Kuntal Ghosh <kuntalghosh.2007 at gmail.com> (Patch: Yes)
    Attachment (undo-2019-05-10.tgz) at 2019-05-10 06:18:16 from Thomas Munro <thomas.munro at gmail.com> (Patch: No)
    Attachment (0001-Update-oldest_data-on-startup_v5.patch) at 2019-05-09 06:34:16 from Dilip Kumar <dilipbalaut at gmail.com> (Patch: Yes)
    Attachment (0005-undo-page-consistency-checker_v4_WIP.patch) at 2019-05-06 12:13:22 from Dilip Kumar <dilipbalaut at gmail.com> (Patch: Yes)
    Attachment (0001-Allow-undo-actions-to-be-applied-on-rollbacks-and-di.v2.patch) at 2019-05-05 04:58:21 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: No)
    Attachment (0005-undo-page-consistency-checker_WIP_v3.patch) at 2019-05-02 04:00:23 from Dilip Kumar <dilipbalaut at gmail.com> (Patch: Yes)
    Attachment (undoprocessing_1.patch) at 2019-05-01 04:38:14 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (0001-Enhance-multi-log-handling-in-undo-log.patch) at 2019-04-25 11:15:44 from Dilip Kumar <dilipbalaut at gmail.com> (Patch: Yes)
    Attachment (0001-Enhance-multi-log-handling-in-undo-log.patch) at 2019-04-19 10:15:43 from Dilip Kumar <dilipbalaut at gmail.com> (Patch: Yes)
    Attachment (undo-smgr-v2.tgz) at 2019-03-12 13:20:29 from Thomas Munro <thomas.munro at gmail.com> (Patch: No)
    Attachment (0001-Fix-shared-memory-size-for-rollback-hash-table.patch) at 2018-11-05 11:42:40 from Kuntal Ghosh <kuntalghosh.2007 at gmail.com> (Patch: Yes)
    Attachment (undo-smgr-v1.tgz) at 2018-11-01 03:22:51 from Thomas Munro <thomas.munro at enterprisedb.com> (Patch: No)