On 2/22/17 9:12 AM, Andres Freund wrote:
That would allow an in-place upgrade of
a really large cluster. A user would still need to modify their code to use
the new type.

Put another way: add ability for pg_upgrade to change the type of a field.
There might be other uses for that as well.
Type oids are unfortunately embedded into composite and array type data
- we can do such changes for columns themselves, but it doesn't work if
there's any array/composite members containing the to-be-changed type
that are used as columns.

Only in the catalog though, not the datums, right? I would think you could just change the oid in the catalog the same as you would for a table column.
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
855-TREBLE2 (855-873-2532)

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