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From Adrien Grand <jpou...@gmail.com>
Subject Re: Read DocValue twice
Date Mon, 19 Feb 2018 13:54:33 GMT
If you want to read the values again, you need to call setDocument (Lucene
< 7.0) or advanceExact (Lucene >= 7.0) before calling nextValue().

Le lun. 19 févr. 2018 à 14:41, Vadim Gindin <vgindin@detectum.com> a écrit :

> Hi all
>
> I use DocValue for scoring function. I.e. I have some column with integers,
> that are used in scoring formula. So I have a scorer that calculates
> scoring function twice:
> - in score()
> - in explain()
>
> I got the following error in explain:
>
> Caused by: java.lang.IndexOutOfBoundsException
>         at java.nio.Buffer.checkIndex(Buffer.java:540) ~[?:1.8.0_161]
>         at java.nio.DirectByteBuffer.get(DirectByteBuffer.java:253)
> ~[?:1.8.0_161]
>         at
> org.apache.lucene.store.ByteBufferGuard.getByte(ByteBufferGuard.java:118)
> ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 -
> ubuntu - 2017-10-13 16:12:42]
>         at
>
> org.apache.lucene.store.ByteBufferIndexInput$SingleBufferImpl.readByte(ByteBufferIndexInput.java:385)
> ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 -
> ubuntu - 2017-10-13 16:12:42]
>         at
>
> org.apache.lucene.util.packed.DirectReader$DirectPackedReader8.get(DirectReader.java:145)
> ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 -
> ubuntu - 2017-10-13 16:12:42]
>         at
>
> org.apache.lucene.codecs.lucene70.Lucene70DocValuesProducer$3.longValue(Lucene70DocValuesProducer.java:481)
> ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 -
> ubuntu - 2017-10-13 16:12:42]
>         at
>
> org.apache.lucene.index.SingletonSortedNumericDocValues.nextValue(SingletonSortedNumericDocValues.java:73)
> ~[lucene-core-7.1.0.jar:7.1.0 84c90ad2c0218156c840e19a64d72b8a38550659 -
> ubuntu - 2017-10-13 16:12:42]
>
> I've found the following comment in the source code of
> SortedNumericDocValues.java:
>
> /**
>  * Iterates to the next value in the current document.  Do not call
> this more than {@link #docValueCount} times
>  * for the document.
>  */
>
> public abstract long nextValue() throws IOException;
>
>
> Questions:
> 1) Why I can't read the values twice?
> 2) How can I manage this situation?
> 3) Can it work for NumericDocValues?
>
> Regards,
> Vadim Gindin
>

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