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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2018-04-07 12:01:11 -0300 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2018-04-07 17:54:39 -0300 |
| commit | 5c0675215e153ba1297fd494b34af2fdebd645d1 (patch) | |
| tree | 516d918faddc7cf5d45ea109bae464d60572593a /src/include/optimizer | |
| parent | f16241bef7cc271bff60e23de2f827a10e50dde8 (diff) | |
| download | postgresql-5c0675215e153ba1297fd494b34af2fdebd645d1.tar.gz | |
Add bms_prev_member function
This works very much like the existing bms_last_member function, only it
traverses through the Bitmapset in the opposite direction from the most
significant bit down to the least significant bit. A special prevbit value of
-1 may be used to have the function determine the most significant bit. This
is useful for starting a loop. When there are no members less than prevbit,
the function returns -2 to indicate there are no more members.
Author: David Rowley
Discussion: https://postgr.es/m/CAKJS1f-K=3d5MDASNYFJpUpc20xcBnAwNC1-AOeunhn0OtkWbQ@mail.gmail.com
Diffstat (limited to 'src/include/optimizer')
0 files changed, 0 insertions, 0 deletions