Re: Range queries

[Erik Hatcher]

Terry and Michael,

Thanks for the clarification. For some reason I though that date fields were represented more oddly than this format. I stand corrected!

Erik


On Wednesday, January 22, 2003, at 10:27 AM, Michael Barry wrote:

I utilize the earlier version and queries such as this work fine with QueryParser:

field:[ 20030120 - 20030125 ]

of course the back-end indexer canonocalizes all date fields to YYYYMMDD.
The front-end search code is responsible for canonocalizing the user inputed
dates to YYYYMMDD. I think the key here would be either to not allow users to
enter free-form dates (provide some type of UI element to enter year, month,
day seperately) or give some copy stating dates should be in YYYYMMDD format.

-Mike.

Erik Hatcher wrote:

Unfortunately I don't believe date field range queries work with QueryParser, or at least not human-readable dates.

Is that correct?

I think it supports date ranges if they are turned into a numeric format, but no human would type that kind of query in. I'm sure supporting true date range queries gets tricky with locale issues and such too.

Erik


On Wednesday, January 22, 2003, at 09:19 AM, Terry Steichen wrote:

Tatu,

I believe the range query syntax for the latest Lucene version is
"field:[lower TO upper]", or "field:[null TO upper]", or "field:[lower TO
null]". In earlier versions replace "TO" with a dash ("-").

I also believe that multiple wildcards ("?" and/or "*") work just fine (as
long as they aren't the first character of the term).

HTH,

Terry

----- Original Message -----
From: "Tatu Saloranta" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, January 22, 2003 11:48 PM
Subject: Range queries

My apologies if this is a FAQ (which is possible as I am new to Lucene,
however, I tried checking the web page for the answer).

I read through the "Query syntax" web page first, and then checked the
matching query classes. It seems like query syntax page is missing some
details; the one I was wondering about was the range query. Since query
parser seems to construct these queries, I guess they have been

implemented,

even though syntax page didn't explain them. Is that correct?

Looking at QueryParser, it seems that inclusive range query uses [ and ],

and

exclusive query { and }? Is this right? And does it expect exactly two
arguments?
Also, am I right in assuming that range uses lexiographic ordering, so

that it

basically includes all possible words (terms) between specified terms

(which

will work ok with numbers/dates as long as they have been padded with

zeroes

or such)?

Another question I have is regarding wildcard search. Page mentions that

there

is a restriction that search term can not start with a wild card (as that
would render index useless I guess... would need to full scan?). However,

it

doesn't mention if multiple wildcards are allowed? All the example cases

just

have single wild card?

Sorry for the newbie questions,

-+ Tatu +-

ps. Thanks for the developers for the neat indexing engine. I am currently
evaluating it for use in a large-scale enterprise content management

system.

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