On Wed, Jul 12, 2017 at 2:30 PM, Mark Rofail <markm.rof...@gmail.com> wrote:

> On Wed, Jul 12, 2017 at 12:53 AM, Alvaro Herrera <alvhe...@2ndquadrant.com
> > wrote:
>> We have one opclass for each type combination -- int4 to int2, int4 to
>> int4, int4 to int8, etc.  You just need to add the new strategy to all
>> the opclasses.
> Can you clarify this solution ? I think another solution would be external
> casting
>> If external casting is to be used. If for example the two types in
question are smallint and integer. Would a function get_common_type(Oid
leftopr, Oid rightopr) be useful ?, that given the two types return the
"common" type between the two in this case integer.

Best Regards,
 Mark Rofail

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