Merge 'grouped_prefetch' into 'trunk'

Merge 'grouped_prefetch' into 'trunk'

r6821@Thesaurus (orig r6820):  ribasushi | 2009-06-28 13:09:11 +0200
Branch for prefetch+group play
r6823@Thesaurus (orig r6822):  ribasushi | 2009-06-28 14:38:36 +0200
Normalize group_by
r6824@Thesaurus (orig r6823):  ribasushi | 2009-06-28 14:39:54 +0200
Proper prefetch+group test
r6826@Thesaurus (orig r6825):  ribasushi | 2009-06-28 14:42:48 +0200
Whoops
r6828@Thesaurus (orig r6827):  ribasushi | 2009-06-28 15:06:57 +0200
Lose the literal sql bits - castaway is right it's silly to support those
r6833@Thesaurus (orig r6832):  ribasushi | 2009-06-28 22:38:43 +0200
Rogue comments
r6837@Thesaurus (orig r6836):  ribasushi | 2009-06-29 09:44:25 +0200
A couple of test fixes
r6838@Thesaurus (orig r6837):  ribasushi | 2009-06-29 09:46:13 +0200
Support for -select/-as in SQLAHacks field selection
r6839@Thesaurus (orig r6838):  ribasushi | 2009-06-29 09:49:53 +0200
This is tested elsewhere
r6840@Thesaurus (orig r6839):  ribasushi | 2009-06-29 09:50:43 +0200
This is tested elsewhere (2)
r6841@Thesaurus (orig r6840):  ribasushi | 2009-06-29 10:07:09 +0200
Test cleanups
r6842@Thesaurus (orig r6841):  ribasushi | 2009-06-29 10:11:13 +0200
Most of the grouped prefetch solution
r6843@Thesaurus (orig r6842):  ribasushi | 2009-06-29 10:14:45 +0200
clearer
r6845@Thesaurus (orig r6844):  ribasushi | 2009-06-29 12:05:37 +0200
And score! (all works)
r6882@Thesaurus (orig r6881):  ribasushi | 2009-06-30 16:23:06 +0200
rs->get_column now properly recognizes prefetch and collapses if at all possible
r6886@Thesaurus (orig r6885):  ribasushi | 2009-06-30 17:39:58 +0200
Whoops