Adding upstream version 15.4.upstream/15.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/contrib/pg_freespacemap/pg_freespacemap--1.1.sql b/contrib/pg_freespacemap/pg_freespacemap--1.1.sql
new file mode 100644
index 0000000..e1b8242
--- /dev/null
+++ b/contrib/pg_freespacemap/pg_freespacemap--1.1.sql
@@ -0,0 +1,25 @@
+/* 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;