/usr/share/postgresql/10/extension/pg_prewarm--1.1.sql is in postgresql-10 10.6-0ubuntu0.18.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | /* contrib/pg_prewarm/pg_prewarm--1.1.sql */
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION pg_prewarm" to load this file. \quit
-- Register the function.
CREATE FUNCTION pg_prewarm(regclass,
mode text default 'buffer',
fork text default 'main',
first_block int8 default null,
last_block int8 default null)
RETURNS int8
AS 'MODULE_PATHNAME', 'pg_prewarm'
LANGUAGE C PARALLEL SAFE;
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