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 ...

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.

On 12th of February, Robert Haas committed patch: Teach ALTER TABLE .. SET DATA TYPE to avoid some table rewrites.   When the old type is binary coercible to the new type and the using clause does not change ...

On 28th of July, Simon Riggs committed patch which: Log Message: ----------- Reduce lock levels of CREATE TRIGGER and some ALTER TABLE, CREATE RULE actions. Avoid hard-coding lockmode used for many altering DDL commands, allowing easier future changes of lock levels. Implementation of initial analysis ...