[Java] use varint for class id encoding to reduce space cost #945
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chaokunyang
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What do these changes do?
This PR use varint for class id encoding to reduce java class writing space cost.
Before this PR, class id will be written as 3 bytes:
With this PR, class id will be written as 1~3 bytes, and for most common used jdk types such as String, class id will be written using 1 bytes, which is much more efficient.
Related issue number
Closes #944
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