Mailing List Archive: Lucene: Java-User

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

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benjamin.pasero at gmail

Feb 9, 2010, 9:04 AM

Post #1 of 2 (542 views)
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Creating a Query that matches Documents without a specific Field set?

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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iorixxx at yahoo

Feb 9, 2010, 9:21 AM

Post #2 of 2 (502 views)
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Re: Creating a Query that matches Documents without a specific Field set? [In reply to]

> 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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