notes/postgres/jsonb_array_add_distinct.sql

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CREATE OR REPLACE FUNCTION public.jsonb_array_add_distinct(_arr jsonb, _add text) RETURNS jsonb AS
$$
DECLARE
_ret jsonb;
BEGIN
SELECT
jsonb_agg(DISTINCT x.ae)
INTO
_ret
FROM
(
SELECT jsonb_array_elements_text(_arr) ae
UNION ALL
SELECT _add ae
) x;
RETURN _ret;
END;
$$
language plpgsql