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select json_arrayagg(json_object(t.*)) from ( select 'qwe' a from dual ) t
ORA-01747: invalid user.table.column, table.column, or column specification
with function f_serialize_json ( query varchar2 ) return clob as ret clob; begin execute immediate ' select json_arrayagg(json_object(t.*)) from (' || query || ' ) t' into ret; return ret; end; select f_serialize_json( q'$select 'qwe' a from dual$' ) as res from dual