Three patches for you today, all committed by Robert Hass:
- On 7th of February, patch:
Add a transform function for numeric typmod coercisions.
This enables ALTER TABLE to skip table and index rebuilds when a column
is changed to an unconstrained numeric, or when the scale is unchanged
and the precision does not decrease.
Noah Misch, with a few stylistic changes and a fix for an OID
collision by me.
- also on 7th, patch:
Add a transform function for varbit typmod coercisions.
This enables ALTER TABLE to skip table and index rebuilds when the
new type is unconstraint varbit, or when the allowable number of bits
is not decreasing.
Noah Misch, with review and a fix for an OID collision by me.
- and a day later final patch:
Add transform functions for various temporal typmod coercisions.
This enables ALTER TABLE to skip table and index rebuilds in some cases.
Noah Misch, with trivial changes by me.
Continue reading Waiting for 9.2 – More rewrite-less ALTER TABLE ALTER TYPEs
On 18th of July, Robert Haas committed patch:
Avoid index rebuild for no-rewrite ALTER TABLE .. ALTER TYPE.
Noah Misch. Review and minor cosmetic changes by me.
Continue reading Waiting for 9.2 – Avoiding reindexing on alter type of indexed column
Finally, on 25th of October, Tom Lane committed patch which does:
Allow new values to be added to an existing enum type.
After much expenditure of effort, we've got this to the point where the
performance penalty is pretty minimal in typical cases.
Andrew Dunstan, reviewed by Brendan Jurd, Dean Rasheed, and Tom Lane
Continue reading Waiting for 9.1 – adding values to enums
On 26th of September, Peter Eisentraut committed patch which adds:
Add ALTER TYPE ... ADD/DROP/ALTER/RENAME ATTRIBUTE
Like with tables, this also requires allowing the existence of
composite types with zero attributes.
reviewed by KaiGai Kohei
Continue reading Waiting for 9.1 – ALTER TYPE