Re: why provide cross type arithmetic operators

for example,

postgres=# select int2'1' + int8'1';
ERROR: operator is not unique: smallint + bigint
LINE 1: select int2'1' + int8'1';
^
HINT: Could not choose a best candidate operator. You may need to add
explicit
type casts.

there are int4 + int8 and int8 + int8, but no int2 + int8, so two operators
available, they are int4 + int8 and int8 + int8,
system can't choose a best candidate operator.

"ykhuang" <hyk(at)ruc(dot)edu(dot)cn> :fn3n3o$1g5r$1(at)news(dot)hub(dot)org(dot)(dot)(dot)
> there are many cross type arithmetic operators, like int2 + int4, int8 +
> int4, I think these can be deleted. Here are the reasons, after deleted,
> int2 + int4 will choose the operator int4 + int4, int8 + int4 choose int8
> + int8, Is that ok? Thanks.
>