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https://issues.apache.org/jira/browse/LUCENE-4591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13511352#comment-13511352
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Adrien Grand commented on LUCENE-4591:
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bq. We would like to store certain fields that requires a different type of
data structure than the one currently supported, i.e., a document is not a
simple list of fields, but a more complex data structure.
How would you do that? As far as I know, the only way to access stored fields
is through the StoredFieldVisitor API, which only supports sequences of fields
which are necessary numbers, strings or byte arrays.
bq. However, this is kind of hacky, and we will have to keep in synch our copy
with the original implementation.
I think writing a different StoredFieldsFormat impl would be a better option as
you could still require only one disk seek in the worst case. You could reuse
some components of CompressingStoredFieldsFormat such as CompressionMode, and
maybe we could expose other ones such as
CompressingStoredFieldsFormatIndexWriter,Reader (they write/read the stored
fields index in a memory-efficient way).
If you don't care about increasing the number of disk seeks and if you can
encode/decode your complex data structure into a small opaque binary blob,
maybe DocValues could be an option (Mike and Robert are adding per-field format
support to DocValues in LUCENE-4547).
> 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
>
>
> 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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