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/* contrib/pg_freespacemap/pg_freespacemap--1.1.sql */
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION pg_freespacemap" to load this file. \quit
-- Register the C function.
CREATE FUNCTION pg_freespace(regclass, bigint)
RETURNS int2
AS 'MODULE_PATHNAME', 'pg_freespace'
LANGUAGE C STRICT PARALLEL SAFE;
-- pg_freespace shows the recorded space avail at each block in a relation
CREATE FUNCTION
pg_freespace(rel regclass, blkno OUT bigint, avail OUT int2)
RETURNS SETOF RECORD
AS $$
SELECT blkno, pg_freespace($1, blkno) AS avail
FROM generate_series(0, pg_relation_size($1) / current_setting('block_size')::bigint - 1) AS blkno;
$$
LANGUAGE SQL PARALLEL SAFE;
-- Don't want these to be available to public.
REVOKE ALL ON FUNCTION pg_freespace(regclass, bigint) FROM PUBLIC;
REVOKE ALL ON FUNCTION pg_freespace(regclass) FROM PUBLIC;