On Mon, Jan 23, 2017 at 2:07 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> Can we arrange to do that differently?  I'd prefer something in which the
> argument and result types are visibly connected to the actual datatypes
> at hand, for instance
>           array_subscript(anyarray, internal) returns anyelement
>           array_assign(anyarray, internal, anyelement) returns anyarray

What about having no internal arguments here at all?  Like if you want
to support foo[4] define a subscript function that takes (mytype, int)
and returns whatever.  You might have to allow for multiple
subscripting functions with different argument types for this to
really work, though.

/me ducks

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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