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Add pg_size_bytes() to parse human-readable size strings.

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This will parse strings in the format produced by pg_size_pretty() and
return sizes in bytes. This allows queries to be written with clauses
like "pg_total_relation_size(oid) > pg_size_bytes('10 GB')".

Author: Pavel Stehule with various improvements by Vitaly Burovoy
Discussion: http://www.postgresql.org/message-id/CAFj8pRD-tGoDKnxdYgECzA4On01_uRqPrwF-8LdkSE-6bDHp0w@mail.gmail.com
Reviewed-by: Vitaly Burovoy, Oleksandr Shulgin, Kyotaro Horiguchi,
    Michael Paquier and Robert Haas
This commit is contained in:
Dean Rasheed
2016-02-20 09:57:27 +00:00
parent 091b6055e3
commit 53874c5228
7 changed files with 331 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

109
src/test/regress/expected/dbsize.out
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@ -35,3 +35,112 @@ SELECT size, pg_size_pretty(size), pg_size_pretty(-1 * size) FROM
1000000000000000.5 | 909 TB | -909 TB
(12 rows)
SELECT size, pg_size_bytes(size) FROM
(VALUES ('1'), ('123bytes'), ('1kB'), ('1MB'), (' 1 GB'), ('1.5 GB '),
('1TB'), ('3000 TB'), ('1e6 MB')) x(size);
size | pg_size_bytes
----------+------------------
1 | 1
123bytes | 123
1kB | 1024
1MB | 1048576
1 GB | 1073741824
1.5 GB | 1610612736
1TB | 1099511627776
3000 TB | 3298534883328000
1e6 MB | 1048576000000
(9 rows)
-- case-insensitive units are supported
SELECT size, pg_size_bytes(size) FROM
(VALUES ('1'), ('123bYteS'), ('1kb'), ('1mb'), (' 1 Gb'), ('1.5 gB '),
('1tb'), ('3000 tb'), ('1e6 mb')) x(size);
size | pg_size_bytes
----------+------------------
1 | 1
123bYteS | 123
1kb | 1024
1mb | 1048576
1 Gb | 1073741824
1.5 gB | 1610612736
1tb | 1099511627776
3000 tb | 3298534883328000
1e6 mb | 1048576000000
(9 rows)
-- negative numbers are supported
SELECT size, pg_size_bytes(size) FROM
(VALUES ('-1'), ('-123bytes'), ('-1kb'), ('-1mb'), (' -1 Gb'), ('-1.5 gB '),
('-1tb'), ('-3000 TB'), ('-10e-1 MB')) x(size);
size | pg_size_bytes
-----------+-------------------
-1 | -1
-123bytes | -123
-1kb | -1024
-1mb | -1048576
-1 Gb | -1073741824
-1.5 gB | -1610612736
-1tb | -1099511627776
-3000 TB | -3298534883328000
-10e-1 MB | -1048576
(9 rows)
-- different cases with allowed points
SELECT size, pg_size_bytes(size) FROM
(VALUES ('-1.'), ('-1.kb'), ('-1. kb'), ('-0. gb'),
('-.1'), ('-.1kb'), ('-.1 kb'), ('-.0 gb')) x(size);
size | pg_size_bytes
--------+---------------
-1. | -1
-1.kb | -1024
-1. kb | -1024
-0. gb | 0
-.1 | 0
-.1kb | -102
-.1 kb | -102
-.0 gb | 0
(8 rows)
-- invalid inputs
SELECT pg_size_bytes('1 AB');
ERROR: invalid size: "1 AB"
DETAIL: Invalid size unit: "AB".
HINT: Valid units are "bytes", "kB", "MB", "GB", and "TB".
SELECT pg_size_bytes('1 AB A');
ERROR: invalid size: "1 AB A"
DETAIL: Invalid size unit: "AB A".
HINT: Valid units are "bytes", "kB", "MB", "GB", and "TB".
SELECT pg_size_bytes('1 AB A ');
ERROR: invalid size: "1 AB A "
DETAIL: Invalid size unit: "AB A".
HINT: Valid units are "bytes", "kB", "MB", "GB", and "TB".
SELECT pg_size_bytes('9223372036854775807.9');
ERROR: bigint out of range
SELECT pg_size_bytes('1e100');
ERROR: bigint out of range
SELECT pg_size_bytes('1e1000000000000000000');
ERROR: invalid size: "1e1000000000000000000"
SELECT pg_size_bytes('1 byte'); -- the singular "byte" is not supported
ERROR: invalid size: "1 byte"
DETAIL: Invalid size unit: "byte".
HINT: Valid units are "bytes", "kB", "MB", "GB", and "TB".
SELECT pg_size_bytes('');
ERROR: invalid size: ""
SELECT pg_size_bytes('kb');
ERROR: invalid size: "kb"
SELECT pg_size_bytes('..');
ERROR: invalid size: ".."
SELECT pg_size_bytes('-.');
ERROR: invalid size: "-."
SELECT pg_size_bytes('-.kb');
ERROR: invalid size: "-.kb"
SELECT pg_size_bytes('-. kb');
ERROR: invalid size: "-. kb"
SELECT pg_size_bytes('.+912');
ERROR: invalid size: ".+912"
SELECT pg_size_bytes('+912+ kB');
ERROR: invalid size: "+912+ kB"
DETAIL: Invalid size unit: "+ kB".
HINT: Valid units are "bytes", "kB", "MB", "GB", and "TB".
SELECT pg_size_bytes('++123 kB');
ERROR: invalid size: "++123 kB"

39
src/test/regress/sql/dbsize.sql
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@ -10,3 +10,42 @@ SELECT size, pg_size_pretty(size), pg_size_pretty(-1 * size) FROM
(10.5::numeric), (1000.5::numeric), (1000000.5::numeric),
(1000000000.5::numeric), (1000000000000.5::numeric),
(1000000000000000.5::numeric)) x(size);
SELECT size, pg_size_bytes(size) FROM
(VALUES ('1'), ('123bytes'), ('1kB'), ('1MB'), (' 1 GB'), ('1.5 GB '),
('1TB'), ('3000 TB'), ('1e6 MB')) x(size);
-- case-insensitive units are supported
SELECT size, pg_size_bytes(size) FROM
(VALUES ('1'), ('123bYteS'), ('1kb'), ('1mb'), (' 1 Gb'), ('1.5 gB '),
('1tb'), ('3000 tb'), ('1e6 mb')) x(size);
-- negative numbers are supported
SELECT size, pg_size_bytes(size) FROM
(VALUES ('-1'), ('-123bytes'), ('-1kb'), ('-1mb'), (' -1 Gb'), ('-1.5 gB '),
('-1tb'), ('-3000 TB'), ('-10e-1 MB')) x(size);
-- different cases with allowed points
SELECT size, pg_size_bytes(size) FROM
(VALUES ('-1.'), ('-1.kb'), ('-1. kb'), ('-0. gb'),
('-.1'), ('-.1kb'), ('-.1 kb'), ('-.0 gb')) x(size);
-- invalid inputs
SELECT pg_size_bytes('1 AB');
SELECT pg_size_bytes('1 AB A');
SELECT pg_size_bytes('1 AB A ');
SELECT pg_size_bytes('9223372036854775807.9');
SELECT pg_size_bytes('1e100');
SELECT pg_size_bytes('1e1000000000000000000');
SELECT pg_size_bytes('1 byte'); -- the singular "byte" is not supported
SELECT pg_size_bytes('');
SELECT pg_size_bytes('kb');
SELECT pg_size_bytes('..');
SELECT pg_size_bytes('-.');
SELECT pg_size_bytes('-.kb');
SELECT pg_size_bytes('-. kb');
SELECT pg_size_bytes('.+912');
SELECT pg_size_bytes('+912+ kB');
SELECT pg_size_bytes('++123 kB');