Item12500: %QUERY's getField is highly inefficient

... when fetching a property of a non-topic revision.

Example:

%QUERY{"'%WEB%.%TOPIC%'/versions[1].info.author"}%

This checks out every single revision down to rev 1 resulting in a lot of sysCommands calling rcs. Instead it should just fetch the given revision.

Related: Item11983: prevent excessive calls into the revision system

Here's the problem in all of its beauty when viewing a topic with 139 revisions:

-- MichaelDaum - 16 May 2013

This is a known problem with the way old versions are queried. It may be possible to implement some sort of hoisting optimisation in the query engine. Anyone is welcome to try#.

-- CrawfordCurrie - 20 May 2013

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