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https://issues.apache.org/jira/browse/LUCENE-4591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13527160#comment-13527160
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Adrien Grand commented on LUCENE-4591:
--------------------------------------
I had a look at CompressingStoredFieldsWriter and I think that having a
different encoding/compression strategy per field would deserve a different
StoredFieldsFormat impl (this is a discussion we had in LUCENE-4226, but in
that case I think we could open up CompressingStoredFieldsIndexWriter/Reader).
However I was thinking that if you don't mind adding one or two extra random
seeks, maybe you could reuse it without extending it, like
{code}
MyCustomStoredFieldsWriter {
StoredFieldsWriter defaultSfw; // the default Lucene 4.1 stored fields writer
writeField(FieldInfo info, StorableField field) {
if (isStandard(field)) {
defaultSfw.writeField(info, field);
} else {
// TODO: custom logic writing non-standard fields to another IndexOutput
}
}
}
{code}
and similarly for the reader
{code}
MyCustomStoredFieldsReader {
StoredFieldsReader defaultSfr; // the default Lucene 4.1 stored fields reader
void visitDocument(int n, StoredFieldVisitor visitor) {
// visit standard fields
defaultSfr.visitDocument(n, visitor);
// TODO then visit specific fields
}
}
{code}
Would it work for your use-case?
> Make StoredFieldsFormat more configurable
> -----------------------------------------
>
> Key: LUCENE-4591
> URL: https://issues.apache.org/jira/browse/LUCENE-4591
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs
> Affects Versions: 4.1
> Reporter: Renaud Delbru
> Fix For: 4.1
>
> Attachments: LUCENE-4591.patch
>
>
> The current StoredFieldsFormat are implemented with the assumption that only
> one type of StoredfieldsFormat is used by the index.
> We would like to be able to configure a StoredFieldsFormat per field,
> similarly to the PostingsFormat.
> There is a few issues that need to be solved for allowing that:
> 1) allowing to configure a segment suffix to the StoredFieldsFormat
> 2) implement SPI interface in StoredFieldsFormat
> 3) create a PerFieldStoredFieldsFormat
> We are proposing to start first with 1) by modifying the signature of
> StoredFieldsFormat#fieldsReader and StoredFieldsFormat#fieldsWriter so that
> they use SegmentReadState and SegmentWriteState instead of the current set of
> parameters.
> Let us know what you think about this idea. If this is of interest, we can
> contribute with a first path for 1).
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