Thread: table inheritance and polymorphic functions

Hello,

Is there any way to set up overloaded functions whose parameters are
composite types (i.e., row types) within a table inheritance hierarchy, so
that postgresql dispatches to the correct function depending on the actual
type of its argument, in an "object-oriented" fashion?  What I mean is this.
Suppose I create a table for CITIES and another table for CAPITALS which
inherits from CITIES.  Can I create same-named overloaded functions on
CITIES and CAPITALS in such a way that the "correct" function is called
depending on the actual type of the row?

Cheers,
David A. Ventimiglia
DSSG
Wells Fargo Bank

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 <<Ventimiglia, David.vcf>>

David.Ventimiglia@wellsfargo.com writes:
> Is there any way to set up overloaded functions whose parameters are
> composite types (i.e., row types) within a table inheritance hierarchy, so
> that postgresql dispatches to the correct function depending on the actual
> type of its argument, in an "object-oriented" fashion?

AFAIK this has always worked: functions on parent tables can be called
on rows of child tables.  What problem are you hitting exactly (and
which PG version are you trying it in)?

            regards, tom lane