On Mon, Mar 22, 2010 at 11:45:21PM +0530, anshul gangwar wrote:
> hello,
>
> I want to know whether BAT ids are fixed.
BAT ids are fixed for the life-time of a BAT, i.e., on creation, a BAT is
assigned an ID, which is keeps unchanged and exclusively until the BAT is
destroyed, again.
> If fixed then what does that
> BAT_select_(b=tmpr_2322): BATslice(v=tmp_2403, low=0, high=1)
> means?
This means that a range (or point) selection on a tail-sorted BAT is
executed by looking up the positions of the lower and higher bound of the
range (using binary search) and then getting the complete result as a
positional slice of the BAT between these two positions.
See MonetDB/src/gdk/gdk_batop.(mx|c) for details.
Stefan
ps: Please note that the information you get about the runtime
algorithm/implementaion choice (using --debug=$[2*1024*1204]) is mainly
meant for core developers of MonetDB when analysing and debugging the
system; hence, it is (a) not guaranteed to be complete and (b) makes
only sense in case you know and understand the code in MonetDB/src/gdk/
quite well ...
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| Dr. Stefan Manegold | mailto:[email protected] |
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