/usr/share/postgresql/9.6/contrib/pgc_casts.sql is in postgresql-comparator 2.2.6-3.
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 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | -- $Id: pgc_casts.sql.in 1022 2010-08-06 07:28:07Z fabien $
LOAD '$libdir/pgc_casts';
CREATE OR REPLACE FUNCTION varbit(BYTEA, INT, BOOL)
RETURNS VARBIT
LANGUAGE C
IMMUTABLE STRICT
AS '$libdir/pgc_casts', 'varbitfrombytea';
-- bit and varbit are binary compatible...
CREATE OR REPLACE FUNCTION tobit(BYTEA, INT, BOOL)
RETURNS BIT
LANGUAGE C
IMMUTABLE STRICT
AS '$libdir/pgc_casts', 'varbitfrombytea';
CREATE OR REPLACE FUNCTION bytea(VARBIT, INT, BOOL)
RETURNS BYTEA
LANGUAGE C
IMMUTABLE STRICT
AS '$libdir/pgc_casts', 'varbittobytea';
CREATE OR REPLACE FUNCTION bytea(BIT, INT, BOOL)
RETURNS BYTEA
LANGUAGE C
IMMUTABLE STRICT
AS '$libdir/pgc_casts', 'varbittobytea';
CREATE OR REPLACE FUNCTION varbit2int2(VARBIT, INT, BOOL)
RETURNS INT2
LANGUAGE C
IMMUTABLE STRICT
AS '$libdir/pgc_casts', 'varbittoint2';
CREATE OR REPLACE FUNCTION bit2int2(BIT, INT, BOOL)
RETURNS INT2
LANGUAGE C
IMMUTABLE STRICT
AS '$libdir/pgc_casts', 'varbittoint2';
-- no data loss, very similar types
-- AS IMPLICIT?
DROP CAST IF EXISTS (BYTEA AS VARBIT);
CREATE CAST (BYTEA AS VARBIT)
WITH FUNCTION varbit(BYTEA, INT, BOOL);
DROP CAST IF EXISTS (BYTEA AS BIT);
CREATE CAST (BYTEA AS BIT)
WITH FUNCTION tobit(BYTEA, INT, BOOL);
-- data loss: the bit length is rounded up
-- AS ASSIGNMENT?
DROP CAST IF EXISTS (VARBIT AS BYTEA);
CREATE CAST (VARBIT AS BYTEA)
WITH FUNCTION bytea(VARBIT, INT, BOOL);
DROP CAST IF EXISTS (BIT AS BYTEA);
CREATE CAST (BIT AS BYTEA)
WITH FUNCTION bytea(BIT, INT, BOOL);
DROP CAST IF EXISTS (VARBIT AS INT2);
CREATE CAST (VARBIT AS INT2)
WITH FUNCTION varbit2int2(VARBIT, INT, BOOL);
DROP CAST IF EXISTS (BIT AS INT2);
CREATE CAST (BIT AS INT2)
WITH FUNCTION bit2int2(BIT, INT, BOOL);
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