[Monetdb-developers] [Monetdb-checkins] MonetDB4/src/modules/plain aggr.mx, , 1.12, 1.13 ascii_io.mx, , 1.34, 1.35 bat.mx, , 1.37, 1.38 mkey.mx, , 1.17, 1.18 radix.mx, , 1.11, 1.12 xtables.mx, , 1.22, 1.23

Sjoerd Mullender sjoerd at acm.org
Mon Jan 4 16:33:41 CET 2010

I forgot to say, a full rebuild will be necessary (some essential macros
deep in gdk were changed).

Sjoerd Mullender wrote:
> Update of /cvsroot/monetdb/MonetDB4/src/modules/plain
> In directory sfp-cvsdas-1.v30.ch3.sourceforge.com:/tmp/cvs-serv28677/MonetDB4/src/modules/plain
> Modified Files:
> 	aggr.mx ascii_io.mx bat.mx mkey.mx radix.mx xtables.mx 
> Log Message:
> Changed the implementation of the offset heap for type string.
> Before, the offset heap would contain values of type var_t (typically
> equal in size to oid), so if there are lots of entries but not that
> many different strings, a lot of space was wasted, since only the
> lower few bytes of the values in the offset heap would be used, the
> rest being zero.
> In this version, the offset heap has a dynamic width.  It starts off
> as a single byte value, and when the offsets become too large to fit
> in a single byte, the heap is upgraded to a short, then an int, and
> finally (if the system uses 64 bit oids) to lng.
> There are tags to mark this change: 
> before_variable_string_offset and after_variable_string_offset.
> Only MonetDB* and pathfinder needed to be changes, so the tags are
> only added there.

Sjoerd Mullender

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