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CREATE OR REPLACE FUNCTION fun(j json) RETURNS text LANGUAGE sql IMMUTABLE PARALLEL SAFE AS $func$ SELECT string_agg(elem ->> 'insert', ' ') FROM json_array_elements(j -> 'ops') elem WHERE json_typeof(elem->'insert') <> 'object'; $func$;
SELECT fun('{ "ops": [ { "insert": "Text 1" }, { "insert": {"video":"..."} }, { "insert": "Text 2" }, { "insert": {"image":"data:image/jpeg;base64,..."} }] }')
fun
Text 1 Text 2