Adjust the cost of Gather for target evaluation

    Attachment (regression.diffs) at 2018-03-29 04:55:38 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (0003-Rewrite-the-code-that-applies-scan-join-targets-to-p.patch) at 2018-03-28 21:01:20 from Robert Haas <robertmhaas at gmail.com> (Patch: Yes)
    Attachment (0004-Rewrite-the-code-that-applies-scan-join-targets-to-p.patch) at 2018-03-27 17:29:48 from Robert Haas <robertmhaas at gmail.com> (Patch: Yes)
    Attachment (0004-Rewrite-the-code-that-applies-scan-join-targets-to-p.patch) at 2018-03-26 21:38:44 from Robert Haas <robertmhaas at gmail.com> (Patch: Yes)
    Attachment (0007-Use-NULL-relids-set.patch) at 2018-03-24 03:11:09 from Robert Haas <robertmhaas at gmail.com> (Patch: Yes)
    Attachment (test_impact_additional_projection.txt) at 2018-03-17 05:16:35 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: No)
    Attachment (0005-Remove-explicit-path-construction-logic-in-create_or.patch) at 2018-03-13 18:31:40 from Robert Haas <robertmhaas at gmail.com> (Patch: Yes)
    Attachment (parallel_paths_include_tlist_cost_v9.patch) at 2018-03-11 12:19:08 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (parallel_paths_include_tlist_cost_v8.patch) at 2018-02-14 10:37:20 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (parallel-paths-tlist-cost-rmh-v2.patch) at 2018-02-01 18:45:47 from Robert Haas <robertmhaas at gmail.com> (Patch: Yes)
    Attachment (parallel-paths-tlist-cost-rmh.patch) at 2018-01-29 22:00:39 from Robert Haas <robertmhaas at gmail.com> (Patch: Yes)
    Attachment (parallel_paths_include_tlist_cost_v7.patch) at 2018-01-02 11:38:55 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (parallel_paths_include_tlist_cost_v6.patch) at 2017-11-09 08:47:48 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (parallel_paths_include_tlist_cost_v5.patch) at 2017-11-05 04:57:56 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (parallel_paths_include_tlist_cost_v4.patch) at 2017-09-19 21:35:56 from Jeff Janes <jeff.janes at gmail.com> (Patch: Yes)
    Attachment (parallel_paths_include_tlist_cost_v3.patch) at 2017-09-14 03:19:18 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (parallel_paths_include_tlist_cost_v2.patch) at 2017-09-05 08:34:31 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (parallel_paths_include_tlist_cost_v1.patch) at 2017-08-21 09:08:04 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (subpath_projection_cost.2.patch) at 2017-07-12 05:25:27 from Amit Kapila <amit.kapila16 at gmail.com> (Patch: Yes)
    Attachment (subpath_projection_cost.patch) at 2017-07-11 20:20:21 from Jeff Janes <jeff.janes at gmail.com> (Patch: Yes)