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53874c5228
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
51 lines
2 KiB
SQL
51 lines
2 KiB
SQL
SELECT size, pg_size_pretty(size), pg_size_pretty(-1 * size) FROM
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(VALUES (10::bigint), (1000::bigint), (1000000::bigint),
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(1000000000::bigint), (1000000000000::bigint),
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(1000000000000000::bigint)) x(size);
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SELECT size, pg_size_pretty(size), pg_size_pretty(-1 * size) FROM
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(VALUES (10::numeric), (1000::numeric), (1000000::numeric),
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(1000000000::numeric), (1000000000000::numeric),
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(1000000000000000::numeric),
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(10.5::numeric), (1000.5::numeric), (1000000.5::numeric),
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(1000000000.5::numeric), (1000000000000.5::numeric),
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(1000000000000000.5::numeric)) x(size);
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SELECT size, pg_size_bytes(size) FROM
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(VALUES ('1'), ('123bytes'), ('1kB'), ('1MB'), (' 1 GB'), ('1.5 GB '),
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('1TB'), ('3000 TB'), ('1e6 MB')) x(size);
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-- case-insensitive units are supported
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SELECT size, pg_size_bytes(size) FROM
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(VALUES ('1'), ('123bYteS'), ('1kb'), ('1mb'), (' 1 Gb'), ('1.5 gB '),
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('1tb'), ('3000 tb'), ('1e6 mb')) x(size);
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-- negative numbers are supported
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SELECT size, pg_size_bytes(size) FROM
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(VALUES ('-1'), ('-123bytes'), ('-1kb'), ('-1mb'), (' -1 Gb'), ('-1.5 gB '),
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('-1tb'), ('-3000 TB'), ('-10e-1 MB')) x(size);
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-- different cases with allowed points
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SELECT size, pg_size_bytes(size) FROM
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(VALUES ('-1.'), ('-1.kb'), ('-1. kb'), ('-0. gb'),
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('-.1'), ('-.1kb'), ('-.1 kb'), ('-.0 gb')) x(size);
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-- invalid inputs
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SELECT pg_size_bytes('1 AB');
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SELECT pg_size_bytes('1 AB A');
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SELECT pg_size_bytes('1 AB A ');
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SELECT pg_size_bytes('9223372036854775807.9');
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SELECT pg_size_bytes('1e100');
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SELECT pg_size_bytes('1e1000000000000000000');
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SELECT pg_size_bytes('1 byte'); -- the singular "byte" is not supported
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SELECT pg_size_bytes('');
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SELECT pg_size_bytes('kb');
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SELECT pg_size_bytes('..');
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SELECT pg_size_bytes('-.');
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SELECT pg_size_bytes('-.kb');
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SELECT pg_size_bytes('-. kb');
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SELECT pg_size_bytes('.+912');
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SELECT pg_size_bytes('+912+ kB');
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SELECT pg_size_bytes('++123 kB');
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