Is it possible to search for the document that specified field doesn't exist
or such field value is null?
--
View this message in context:
http://www.nabble.com/Search-for-null-tf4130600.html#a11746864
Sent from the Lucene - Java Users mailing list archive at Nabbl
On Jul 23, 2007, at 11:32 AM, testn wrote:
Is it possible to search for the document that specified field
doesn't exist
or such field value is null?
This is from Solr, so I'm not sure off the top of my head if this
mojo applies by itself, but a search for -fieldname:[* TO *] will
result
Does this particular range query have any significant performance issues?
Les
Erik Hatcher wrote:
On Jul 23, 2007, at 11:32 AM, testn wrote:
Is it possible to search for the document that specified field
doesn't exist
or such field value is null?
This is from Solr, so I'm not sure off the
If you want performance, a better way might be to assign some special
string/value (if it's easy to create) to the missing field of docs and
index the field without tokenizing it. Then you may search for that
special value to find the docs.
Jay
Les Fletcher wrote:
Does this particular range
Perhaps you can use a filter in the following way.
-Create a filter (via QueryFilter) that would contain all document that
do not have null values for the field
-flip the bits of the filter so that it now contains documents that have
null values for a field
-Use the filter in conjunction with subs
ee only. It may contain
> privileged
> information. The contents are not to be disclosed to anyone other than the
> addressee.
> Unauthorised recipients are requested to preserve this confidentiality and
> to advise
> us of any errors in transmission. Thank you.
>
> hotonline ltd is registered in England &
On 7/24/07, daniel rosher <[EMAIL PROTECTED]> wrote:
Perhaps you can use a filter in the following way.
-Create a filter (via QueryFilter) that would contain all document that
do not have null values for the field
-flip the bits of the filter so that it now contains documents that have
null valu
isclosed to anyone other than
the
> addressee.
> Unauthorised recipients are requested to preserve this confidentiality
and
> to advise
> us of any errors in transmission. Thank you.
>
> hotonline ltd is registered in England
daniel rosher wrote:
Perhaps you can use a filter in the following way.
-Create a filter (via QueryFilter) that would contain all document that
do not have null values for the field
Interesting: what does the QueryFilter look like? Isn't it just as hard
as finding out what docs have the null
You will be unable to search for fields that do not exist which is what
you originally wanted to do, instead you can do something like:
-Establish the query that will select all non-null values
TermQuery tq1 = new TermQuery(new Term("field","value1"));
TermQuery tq2 = new TermQuery(new Term("fiel
what if I do not know all possible values of that field which is a
typical case in a free text search?
daniel rosher wrote:
You will be unable to search for fields that do not exist which is what
you originally wanted to do, instead you can do something like:
-Establish the query that will sel
In this case you should look at the source for RangeFilter.java.
Using this you could create your own filter using TermEnum and TermDocs
to find all documents that had some value for the field.
You would then flip this filter (perhaps write a FlipFilter.java, that
takes an existing filter in it
On Thursday 26 July 2007 03:12:20 daniel rosher wrote:
> In this case you should look at the source for RangeFilter.java.
>
> Using this you could create your own filter using TermEnum and TermDocs
> to find all documents that had some value for the field.
That's certainly the way to do it for spe
Hi,
I have some question regarding the search. In a document we can have
several fields but not all fields have the value in all documents i.e.
some fields in a document can have null or empty string. But how to
search for a null field value in a document using the IndexSearcher? Any
idea wil
Perhaps the most straight-forward way would be to index a known unique value
for each document that would have had a null entry. Conceptually, when a
field would be null, index the value "nothinghere". Then you can just search
on documents where the value is equal to "nothinghere".
Alternatively,
15 matches
Mail list logo
