/usr/share/postgresql/9.3/contrib/pgc_checksum.sql is in postgresql-comparator 2.2.2-1.
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 15 16 17 18 19 20 21 | -- $Id: pgc_checksum.sql.in 1022 2010-08-06 07:28:07Z fabien $
LOAD '$libdir/pgc_checksum';
CREATE OR REPLACE FUNCTION cksum2(TEXT)
RETURNS INT2
LANGUAGE C
CALLED ON NULL INPUT
AS '$libdir/pgc_checksum', 'text_checksum2';
CREATE OR REPLACE FUNCTION cksum4(TEXT)
RETURNS INT4
LANGUAGE C
CALLED ON NULL INPUT
AS '$libdir/pgc_checksum', 'text_checksum4';
CREATE OR REPLACE FUNCTION cksum8(TEXT)
RETURNS INT8
LANGUAGE C
CALLED ON NULL INPUT
AS '$libdir/pgc_checksum', 'text_checksum8';
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