From: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
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To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
Subject: | pgsql: Add bms_prev_member function |
Date: | 2018-04-07 21:02:18 |
Message-ID: | E1f4uyY-0005jD-MV@gemulon.postgresql.org |
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Thread: | |
Lists: | pgsql-committers |
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
Branch
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master
Details
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https://git.postgresql.org/pg/commitdiff/5c0675215e153ba1297fd494b34af2fdebd645d1
Modified Files
--------------
src/backend/nodes/bitmapset.c | 95 +++++++++++++++++++++++++++++++++++++++++++
src/include/nodes/bitmapset.h | 1 +
2 files changed, 96 insertions(+)
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