LuYunCheng created LUCENE-10661:
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Summary: Reduce memory copy in BytesStore
Key: LUCENE-10661
URL: https://issues.apache.org/jira/browse/LUCENE-10661
Project: Lucene - Core
Issue Type: Improvement
Reporter: LuYunCheng
This is derived from [LUCENE-10627](https://github.com/apache/lucene/pull/987)
AND [LUCENE-10657](https://github.com/apache/lucene/pull/1034)
The abstract method copyBytes in DataOutput have to copy from input to a
copyBuffer and then write into BytesStore.blocks, which is called in FST
initialization read from metaIn.
Although, this copy bytes only a few bytes (in the testscase only 3-10 bytes),
i think we can save this memory copy, just save the DataOutput.copyBytes to
create new copyBuffer with 16384 bytes
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