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Posted to java-user@lucene.apache.org by Doug Cutting <cu...@lucene.com> on 2002/11/04 19:40:40 UTC
Re: Deleting fields from a Document
Kelvin Tan wrote:
> Document maintains a linked list of Fields. It would be not be
> difficult to delete a random Field, albeit a little inefficient.
That would delete it from the in-memory representation, but, once it has
been indexed, there is no easy way to remove a field value from a
document other than to delete the document and re-add it.
Doug
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Re: Deleting fields from a Document
Posted by Doug Cutting <cu...@lucene.com>.
Kelvin Tan wrote:
> Does an in-memory Field guarantee access to its name and value? Say I
> retrieve a Field from a Document A, and add it to a new Document B.
> Before writing B to the index, I delete A. Would B still contain the
> Field? If so, does it work for both String-based and Reader-based
> values?
Readers can only be consumed once and they are never stored. So a
retrieved document will never have a Reader-valued field, and if a
Document instance with a Reader-valued field is added to two indexes
then this field will in effect only be added to the first index.
Other than that, documents instances may be added to multiple indexes.
Deleting a document from an index does not alter a retrieved document
instance. Note however that retrieved document instances will not
contain unstored fields.
Doug
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Re: Deleting fields from a Document
Posted by Kelvin Tan <ke...@relevanz.com>.
This brings me to a related discussion: in-memory and index Field
representations.
Does an in-memory Field guarantee access to its name and value? Say I
retrieve a Field from a Document A, and add it to a new Document B.
Before writing B to the index, I delete A. Would B still contain the
Field? If so, does it work for both String-based and Reader-based
values?
Regards,
Kelvin
On Mon, 04 Nov 2002 10:40:40 -0800, Doug Cutting said:
>Kelvin Tan wrote:
>>Document maintains a linked list of Fields. It would be not be
>>difficult to delete a random Field, albeit a little inefficient.
>
>That would delete it from the in-memory representation, but, once it
>has been indexed, there is no easy way to remove a field value from
>a document other than to delete the document and re-add it.
>
>Doug
>
>
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