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adenecheJulien Le Dem
2f84493371b
adeneche authored and Julien Le Dem committed 3d2e4df219d
ARROW-337: UnionListWriter.list() is doing more than it should, this …

…can cause data corruption

The general idea is to use the "inner" writer's position to update the offset. This involves making sure various writers do indeed update their positions.

UnionListWriter.startList() should explicitly set the inner writer position in case setPosition() was called to move the union list writer's position

Author: adeneche <adeneche@dremio.com>

Closes #183 from adeneche/ARROW-337 and squashes the following commits:

1ae7e00 [adeneche] updated TestComplexWriter to ensure position is set properly by the various writers
7d5aefc [adeneche] ARROW-337: UnionListWriter.list() is doing more than it should, this can cause data corruption