3 commits

Author	SHA1	Message	Date
Peter Eisentraut	fc946c39ae	Remove useless whitespace at end of lines	2010-11-23 22:34:55 +02:00
Tom Lane	2d1d96b1ce	Teach the system how to use hashing for UNION. (INTERSECT/EXCEPT will follow, ... but seem like a separate patch since most of the remaining work is on the executor side.) I took the opportunity to push selection of the grouping operators for set operations into the parser where it belongs. Otherwise this is just a small exercise in making prepunion.c consider both alternatives. As with the recent DISTINCT patch, this means we can UNION on datatypes that can hash but not sort, and it means that UNION without ORDER BY is no longer certain to produce sorted output.	2008-08-07 01:11:52 +00:00
Tom Lane	85188ab883	Extend COPY to support COPY (SELECT ...) TO ... ... Bernd Helmle	2006-08-30 23:34:22 +00:00