Hi All,

I am reading Java vector refactor code and come cross
readerIndex/writerIndex on ArrowBuf. This issue has been brought up by
Siddharth
Teotia earlier but I might have missed the discussion so what to clarify.

My understanding is that the current implementation in java refactor branch
ignore reader/writerIndex on ArrowBuf. None of the arrow code sets or uses
reader/writerIndex on ArrowBuf.

I'd like to get thoughts from people regarding this issue:
(1) Ignoring readerIndex/writerIndex is good because ...
(2) Ignoring readerIndex/writerIndex is bad because...

The before refactor code - it seems somewhat inconsistent with this matter
- there are code that uses reader/writerIndex but the "set" method doesn't
seem to advance writerIndex.

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