> My question is, do those types have an internal framing format with an outer
> length and an inner opaque structure, or does each one have a "length"
> accessor to which an opaque structure is passed? In the former case, we'll
> be burning more space on a length indicator even though the address family
> and prefix length are in the opaque part of the structure. In the latter
> case, there's no big deal at all since given the address family and prefix
> length, an accessor can tell the type system the size of a particular datum.
The length is on every field. atttypmod is a fixed value stored in the
attribute table, and is used to modify the handling of all value in that
column. We currently only use it for char(3)/varchar(30), etc.
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