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| author | Robert Haas <rhaas@postgresql.org> | 2017-03-14 14:33:14 -0400 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2017-03-14 14:33:14 -0400 |
| commit | 2609e91fcf9dcf36af40cd0c5b755dccf6057df6 (patch) | |
| tree | aca849f07776f6f31a1ea06ef4c90497d27883d1 /contrib/postgres_fdw/postgres_fdw.c | |
| parent | c11453ce0aeaa377cbbcc9a3fc418acb94629330 (diff) | |
| download | postgresql-2609e91fcf9dcf36af40cd0c5b755dccf6057df6.tar.gz postgresql-2609e91fcf9dcf36af40cd0c5b755dccf6057df6.zip | |
Fix regression in parallel planning against inheritance tables.
Commit 51ee6f3160d2e1515ed6197594bda67eb99dc2cc accidentally changed
the behavior around inheritance hierarchies; before, we always
considered parallel paths even for very small inheritance children,
because otherwise an inheritance hierarchy with even one small child
wouldn't be eligible for parallelism. That exception was inadverently
removed; put it back.
In passing, also adjust the degree-of-parallelism comptuation for
index-only scans not to consider the number of heap pages fetched.
Otherwise, we'll avoid parallel index-only scans on tables that are
mostly all-visible, which isn't especially logical.
Robert Haas and Amit Kapila, per a report from Ashutosh Sharma.
Discussion: http://postgr.es/m/CAE9k0PmgSoOHRd60SHu09aRVTHRSs8s6pmyhJKWHxWw9C_x+XA@mail.gmail.com
Diffstat (limited to 'contrib/postgres_fdw/postgres_fdw.c')
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