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https://issues.apache.org/jira/browse/LUCENE-6115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14248222#comment-14248222
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Adrien Grand commented on LUCENE-6115:
--------------------------------------
We already have testWriteReadMerge which tests merging across codecs, I'll add
another test with a filter reader.
> Add getMergeInstance to CompressingStoredFieldsReader
> -----------------------------------------------------
>
> Key: LUCENE-6115
> URL: https://issues.apache.org/jira/browse/LUCENE-6115
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-6115.patch
>
>
> CompressingStoredFieldsReader is currently terrible at merging with different
> codecs or wrapped readers since it does not keep state. So if you want to get
> 5 documents that come from the same block, it means that you will have to
> decode the block header and decompress 5 times. It has some optimizations so
> that if you want to get the 2nd doc of the block then it will stop
> decompressing soon after the 2nd document, but it doesn't help much with
> merging since we want all documents.
> We should implement getMergeInstance and have a different behaviour when
> merging by decompressing everything up-front and then reusing for all
> documents of the block.
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