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Commitb181062

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Fix incorrect return value for pg_size_pretty(bigint)
pg_size_pretty(bigint) would return the value in bytes rather than PBfor the smallest-most bigint value. This happened due to an incorrectassumption that the absolute value of -9223372036854775808 could bestored inside a signed 64-bit type.Here we fix that by instead storing that value in an unsigned 64-bit type.This bug does exist in versions prior to 15 but the code there issufficiently different and the bug seems sufficiently non-critical thatit does not seem worth risking backpatching further.Author: Joseph Koshakow <koshy44@gmail.com>Discussion:https://postgr.es/m/CAAvxfHdTsMZPWEHUrZ=h3cky9Ccc3Mtx2whUHygY+ABP-mCmUw@mail.gmail.comBackpatch-through: 15
1 parent1e666fd commitb181062

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3 files changed

+18
-2
lines changed

3 files changed

+18
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lines changed

‎src/backend/utils/adt/dbsize.c

Lines changed: 6 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -575,9 +575,13 @@ pg_size_pretty(PG_FUNCTION_ARGS)
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for (unit=size_pretty_units;unit->name!=NULL;unit++)
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{
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uint8bits;
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uint64abs_size=size<0 ?0- (uint64)size : (uint64)size;
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/* use this unit if there are no more units or we're below the limit */
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if (unit[1].name==NULL||i64abs(size)<unit->limit)
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/*
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* Use this unit if there are no more units or the absolute size is
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* below the limit for the current unit.
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*/
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if (unit[1].name==NULL||abs_size<unit->limit)
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{
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if (unit->round)
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size=half_rounded(size);

‎src/test/regress/expected/dbsize.out

Lines changed: 8 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -79,6 +79,14 @@ SELECT size, pg_size_pretty(size), pg_size_pretty(-1 * size) FROM
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11528652096115048448 | 10240 PB | -10240 PB
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(12 rows)
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-- Ensure we get the expected results when passing the extremities of bigint
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SELECT pg_size_pretty('-9223372036854775808'::bigint),
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pg_size_pretty('9223372036854775807'::bigint);
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pg_size_pretty | pg_size_pretty
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----------------+----------------
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-8192 PB | 8192 PB
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(1 row)
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-- pg_size_bytes() tests
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SELECT size, pg_size_bytes(size) FROM
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(VALUES ('1'), ('123bytes'), ('256 B'), ('1kB'), ('1MB'), (' 1 GB'), ('1.5 GB '),

‎src/test/regress/sql/dbsize.sql

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -27,6 +27,10 @@ SELECT size, pg_size_pretty(size), pg_size_pretty(-1 * size) FROM
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(11258449312612351::numeric), (11258449312612352::numeric),
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(11528652096115048447::numeric), (11528652096115048448::numeric)) x(size);
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-- Ensure we get the expected results when passing the extremities of bigint
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SELECT pg_size_pretty('-9223372036854775808'::bigint),
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pg_size_pretty('9223372036854775807'::bigint);
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-- pg_size_bytes() tests
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SELECT size, pg_size_bytes(size)FROM
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(VALUES ('1'), ('123bytes'), ('256 B'), ('1kB'), ('1MB'), (' 1 GB'), ('1.5 GB'),

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