Creating a Query that matches Documents without a specific Field set?

[Benjamin Pasero <be...@gmail.com>]

Hi,

is there any way I can search for Documents that have a specific Field not set?

The use case is obvious: Consider you introduce a new field to your
documents but dont want to migrate all other documents,
how would you be able to write a Query that covers both old and new documents?

I was hoping that a simple TermQuery where the term value was set to
be an empty String would help me out but I was prooven
wrong.

Thanks for helping,
Ben

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Re: Creating a Query that matches Documents without a specific Field set?

[Ahmet Arslan <io...@yahoo.com>]

> is there any way I can search for Documents that have a
> specific Field not set?

Yes. If you are using QueryParser  *:* -specificField:[* TO *]
 
> I was hoping that a simple TermQuery where the term value
> was set to be an empty String would help me out but I was prooven
> wrong.

org.apache.lucene.search.MatchAllDocsQuery combined with RangeQuery can do that if you are constructing your queries programmatically.


      

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