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How reliable is Lucene when counting hits/documents?

If a run a search: "+house +car" and returns 5,343,56开发者_如何学Python2 hits

Is that the exact number of documents I have, or it's an approximation.

If it's an approximation, is there a way to make it to return the extract number of documents that qualifies for a search query?


It's exact. What makes you think it's an approximation?

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