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From "Jonathan Mamou (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1001) Add Payload retrieval to Spans
Date Sun, 16 Nov 2008 13:16:56 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647965#action_12647965
] 

Jonathan Mamou commented on LUCENE-1001:
----------------------------------------

Hi,

I use getPayloadSpans to get the spans (PayloadSpans spans = sq.getPayloadSpans(this.getIndexReader());)
and for each span I extract the relevant payload using spans.getPayload() (after calling spans.next()).
 
I have tested it for a SpanNearQuery, I have stored the offset in the payload (for testing).


It seems to me that the payloads returned for the span (spans.getPayload()) does not match
the current span (given by span.next()). In fact, the offset returned by the payload are different
from the offset returned by span.start().
It occurs when they are multiple occurrences of the terms. 

Are you aware of this bug?

Thanks,

Jonathan 

> Add Payload retrieval to Spans
> ------------------------------
>
>                 Key: LUCENE-1001
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1001
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Search
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 2.4
>
>         Attachments: LUCENE-1001.patch, LUCENE-1001.patch, LUCENE-1001.patch, LUCENE-1001.patch,
LUCENE-1001.patch, LUCENE-1001.patch, LUCENE-1001.patch, LUCENE-1001.patch
>
>
> It will be nice to have access to payloads when doing SpanQuerys.
> See http://www.gossamer-threads.com/lists/lucene/java-dev/52270 and http://www.gossamer-threads.com/lists/lucene/java-dev/51134
> Current API, added to Spans.java is below.  I will try to post a patch as soon as I can
figure out how to make it work for unordered spans (I believe I have all the other cases working).
> {noformat}
>  /**
>    * Returns the payload data for the current span.
>    * This is invalid until {@link #next()} is called for
>    * the first time.
>    * This method must not be called more than once after each call
>    * of {@link #next()}. However, payloads are loaded lazily,
>    * so if the payload data for the current position is not needed,
>    * this method may not be called at all for performance reasons.<br>
>    * <br>
>    * <p><font color="#FF0000">
>    * WARNING: The status of the <b>Payloads</b> feature is experimental.
>    * The APIs introduced here might change in the future and will not be
>    * supported anymore in such a case.</font>
>    *
>    * @return a List of byte arrays containing the data of this payload
>    * @throws IOException
>    */
>   // TODO: Remove warning after API has been finalized
>   List/*<byte[]>*/ getPayload() throws IOException;
>   /**
>    * Checks if a payload can be loaded at this position.
>    * <p/>
>    * Payloads can only be loaded once per call to
>    * {@link #next()}.
>    * <p/>
>    * <p><font color="#FF0000">
>    * WARNING: The status of the <b>Payloads</b> feature is experimental.
>    * The APIs introduced here might change in the future and will not be
>    * supported anymore in such a case.</font>
>    *
>    * @return true if there is a payload available at this position that can be loaded
>    */
>   // TODO: Remove warning after API has been finalized
>   public boolean isPayloadAvailable();
> {noformat}

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