CREATE OR REPLACE FUNCTION datamart.f_test (
  p_text text
)
RETURNS tsquery AS
$body$
SELECT plainto_tsquery('')
$body$
LANGUAGE 'sql'
IMMUTABLE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 100;

SELECT datamart.f_test('')::TEXT
FROM (VALUES ('aa'),('dd')) AS t

CREATE OR REPLACE FUNCTION datamart.function (
  p1 text
)
RETURNS TABLE (
  f1 text
) AS
$body$
SELECT datamart.f_test($1)::TEXT
FROM (VALUES ('aa'),('dd')) AS t
$body$
LANGUAGE 'sql'
STABLE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 100 ROWS 1000;

SELECT * FROM datamart.function ('')

CREATE OR REPLACE FUNCTION datamart.function (
  p1 text
)
RETURNS TABLE (
  f1 text
) AS
$body$
SELECT datamart.f_test($1)::TEXT
FROM (VALUES ('aa'),('dd')) AS t
$body$
LANGUAGE 'sql'
VOLATILE
CALLED ON NULL INPUT
SECURITY INVOKER
COST 100 ROWS 1000;

CREATE OR REPLACE FUNCTION datamart.function (
  p1 text
)
RETURNS TABLE (
  f1 text
) AS
$body$
SELECT datamart.f_test($1)::TEXT
FROM (VALUES ('aa'),('dd')) AS t
$body$
LANGUAGE 'sql'
STABLE
CALLED ON NULL INPUT
SECURITY DEFINER
COST 100 ROWS 1000;