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| author | Peter Geoghegan <pg@bowt.ie> | 2019-11-12 13:08:41 -0800 |
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| committer | Peter Geoghegan <pg@bowt.ie> | 2019-11-12 13:08:41 -0800 |
| commit | 1f55ebae27225111d0a5c4d89d7e77d917357ff4 (patch) | |
| tree | 2baf8563185a75129b01d773eca7123a64523fd4 /src/backend/commands/dbcommands.c | |
| parent | dcb7d3cafa3197c5425c129ba0dc5eddd23c0532 (diff) | |
| download | postgresql-1f55ebae27225111d0a5c4d89d7e77d917357ff4.tar.gz postgresql-1f55ebae27225111d0a5c4d89d7e77d917357ff4.zip | |
Make _bt_keep_natts_fast() use datum_image_eq().
An upcoming patch that adds deduplication to the nbtree AM will rely on
_bt_keep_natts_fast() understanding that differences in TOAST input
state can never affect its answer. In particular, two opclass-equal
datums (with opclasses deemed safe for deduplication) should never be
treated as unequal by _bt_keep_natts_fast() due to TOAST input
differences.
This also seems like a good idea on general principle. nbtsplitloc.c
will now occasionally make better decisions about where to split a leaf
page. The behavior of _bt_keep_natts_fast() is now somewhat closer to
the behavior of _bt_keep_natts().
Discussion: https://postgr.es/m/CAH2-Wzn3Ee49Gmxb7V1VJ3-AC8fWn-Fr8pfWQebHe8rYRxt5OQ@mail.gmail.com
Diffstat (limited to 'src/backend/commands/dbcommands.c')
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