CREATE FUNCTION sql_const() RETURNS double precision
    AS $$SELECT '6378168'::float8$$
    LANGUAGE sql IMMUTABLE;

CREATE DOMAIN sql_domain AS double precision
	CONSTRAINT on_surface CHECK (((abs((VALUE / sql_const())) - (1)::double precision) < (0.00000099999999999999995)::double precision));

CREATE TABLE sql_table(
	val  sql_domain
);

COPY sql_table (val) FROM stdin;
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\.