[jira] Resolved: (LUCENE-762) [PATCH] Efficiently retrieve sizes of field values

["Grant Ingersoll (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Grant Ingersoll resolved LUCENE-762.
------------------------------------

    Resolution: Fixed

I have committed the original patch.  All tests pass.  In the end, I could not find a way I felt comfortable with for getting rid of the if-then-else clause in FieldsReader.  I did add a TODO item there to remind us to go back and take a look at it again later.

Since the if clauses are ordered according to their most common usages (I think), I don't think there will be much of a performance issue w/ the current approach.

> [PATCH] Efficiently retrieve sizes of field values
> --------------------------------------------------
>
>                 Key: LUCENE-762
>                 URL: https://issues.apache.org/jira/browse/LUCENE-762
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Store
>    Affects Versions: 2.1
>            Reporter: Chuck Williams
>         Assigned To: Grant Ingersoll
>            Priority: Minor
>         Attachments: SizeFieldSelector.patch
>
>
> Sometimes an application would like to know how large a document is before retrieving it.  This can be important for memory management or choosing between algorithms, especially in cases where documents might be very large.
> This patch extends the existing FieldSelector mechanism with two new FieldSelectorResults:  SIZE and SIZE_AND_BREAK.  SIZE creates fields on the retrieved document that store field sizes instead of actual values.  SIZE_AND_BREAK is especially efficient if one field comprises the bulk of the document size (e.g., the body field) and can thus be used as a reasonable size approximation.

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