| From: | Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com> |
|---|---|
| To: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | ALTER TABLE ADD COLUMN fast default |
| Date: | 2017-12-06 14:36:23 |
| Message-ID: | 31e2e921-7002-4c27-59f5-51f08404c858@2ndQuadrant.com |
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| Lists: | pgsql-hackers |
Attached is a patch for $subject. It's based on Serge Reilau's patch of
about a year ago, taking into account comments made at the time. with
bitrot removed and other enhancements such as documentation.
Essentially it stores a value in pg_attribute that is used when the
stored tuple is missing the attribute. This works unless the default
expression is volatile, in which case a table rewrite is forced as
happens now.
Comments welcome.
cheers
andrew
--
Andrew Dunstan https://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
| Attachment | Content-Type | Size |
|---|---|---|
| fast_default-v2.patch | text/x-patch | 102.8 KB |
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