This re-introduces expensive columns been disabled time ago and adds
even more to it. We are now showing last comment, last ack comment and
service problem count on hosts in list views.
It still costs performance, but seems that we can stand it. I'd like
to add more like this to the host view.
This is still experimental. We normalize a lot of columns, this allows
us to sort in a convenient way while having nice "showable" columns.
When used as filters (same goes for ordering) however, functions and
operations on table columns often hinder the db from using indexes.
The new filter implementation allows us to override query creating per
single column, that's what this first sample is trying to show. We still
need to fix alias handling, so unfortunately I have to deal with "real
columns" in the case construct.
Performance gain in large environments is impressive, more to come.
Different changes have been applied:
* Allow integer unix timestamps as parameters for timestamp columns
* Remove alias-rewriting from Url class
* Remove all traces of raw_timestamp
* Use new filters
This takes care of timestamp columns, modifies queries in a way not
depending on db functions, filters are passed through to subqueries
for better performance.
This was never thought to be used in frontends. Frontend code ALWAYS
needs to work with unix timestamps, raw timestamps are used internally
(e.g. between View and Query) to achieve better search and sort
performance.
I guess this needs some more investigation, desiredColumns are the
ones the user asked for ([alias => ]column), with column being once
again an alias in the "real" query. Alias resolution used to work
better long time ago, we should reflect on this.
IDO version is cached in a session namespace. This fails where you
are using multiple IDO backends with different versions. We still have
no backend-specific base class where we could handle this, so for now
I continue to do so in the IdoQuery.
This patch creates one namespace per Host/dbname combination.
We want to make use of new IDO features without breaking compatibility.
This is a quickfix as otherwise we would currently break everything
below 1.10. Code contains a few TODOs as this needs improvement.
BaseQuery should no longer be abstract but be usable as is as soon as
we stripped ResultSet-specific tasks. As "Base" suggests something that
must be extended, the name no longer fits. So this is SimpleQuery right
now.
Since the BaseQuery no longer allows passing the columns to select via
its the constructor, the columns are resolved when set by the
columns() function.
