LightDB-A 兼容oracle支持mod操作符

LightDB-A 为了兼容oracle，从23.3版本开始支持mod操作符，其语义同 ‘%’ 操作符，使用案例如下：

select 5 mod 2;?column? 
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(1 row)select 0 % 0;
ERROR:  division by zeroselect 5 % 0;
ERROR:  division by zeroselect -1 % 0;
ERROR:  division by zeroselect -1 % 2;?column? 
-----------1
(1 row)select -1 % 3;?column? 
-----------1
(1 row)select -2 % 3;?column? 
-----------2
(1 row)do $$
DECLARE
id int;
beginid := 7 mod 4;RAISE NOTICE 'id = %', id;
end;
$$;NOTICE:  id = 3
DO