--On Freitag, 21. November 2003 21:58 Uhr +0100 Dieter Maurer <dieter@handshake.de> wrote:
Small Business Services wrote at 2003-11-20 13:55 -0500:
... Is there any way/interest in having this '*term' type of wildcard searching > built into ZCTextIndex?
You can just remove the statement that raises the exception and see what happens (with respect to runtime).
The standard way to support so called "left truncation" is to build a mapping "R" "s.reverse() --> s" for each word "s" in your index. With this map, "left truncation" can be mapped to "right truncation" as you use your reversed pattern to scan through "R"s keys.
This still does not support truncation on both sides: to make this efficiently, you need sub-word indexes.
Truncation can be achived very easily by performing a range search on BTrees....very evil but it works!. -aj´