假设我有这张表：
Table "public.orders"
Column | Type | Collation | Nullable | Default
-----------------+---------------+-----------+----------+---------
o_orderkey | integer | | not null |
o_custkey | integer | | |
o_orderstatus | character(1) | | |
o_totalprice | numeric(12,2) | | |
o_orderdate | date | | |
o_orderpriority | character(15) | | |
o_clerk | character(15) | | |
o_shippriority | integer | | |
o_comment | character(79) | | |
如果我有涉及o_orderstatus、o_orderpriority或列的查询，我可以将数据类型更改为 以改进它们吗o_clerk？o_commentchar(n)text