Adrien Grand created LUCENE-6115:
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Summary: 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
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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