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Pindikura RavindraKorn, Uwe
a5d8ccc3fc7
Pindikura Ravindra authored and Korn, Uwe committed 61b2926fdbd
ARROW-4532: [Java] fix bug causing very large varchar value buffers

The varchar/varbinary vectors have a setSafe variant that takes an arrow buf and a start/end offsets. The method needs to expand the buffer to make space for 'end - start' bytes. but, due to a bug, it was expanding it to accommodate 'end' bytes, thereby making the value buffer much larger than required.

Author: Pindikura Ravindra <ravindra@dremio.com>

Closes #3613 from pravindra/varchar and squashes the following commits:

1b4f2243 <Pindikura Ravindra> ARROW-4532: fix review comments
8f88e3aa <Pindikura Ravindra> ARROW-4532:  fix a size compute bug