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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
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src/include/utils/builtins.h
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@@ -473,6 +473,7 @@ extern Datum pg_relation_size(PG_FUNCTION_ARGS);
extern Datum pg_total_relation_size(PG_FUNCTION_ARGS);
extern Datum pg_size_pretty(PG_FUNCTION_ARGS);
extern Datum pg_size_pretty_numeric(PG_FUNCTION_ARGS);
extern Datum pg_size_bytes(PG_FUNCTION_ARGS);
extern Datum pg_table_size(PG_FUNCTION_ARGS);
extern Datum pg_indexes_size(PG_FUNCTION_ARGS);
extern Datum pg_relation_filenode(PG_FUNCTION_ARGS);