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Bryan CutlerWes McKinney
ac997fb5cc1
Bryan Cutler authored and Wes McKinney committed 545496c8346
ARROW-1619: [Java] Set lastSet in JsonFileReader

When reading a vector in JsonFileReader, lastSet should be set in VariableWidthVectors after reading inner vectors or else subsequent operations could corrupt the offsets.  This also allows to simplify some of the related code.  Additionally, ListVector.lastSet should be explicitly initialized to 0, which is it's starting offset.

Author: Bryan Cutler <cutlerb@gmail.com>

Closes #1140 from BryanCutler/java-JsonReader-setLast-ARROW-1619 and squashes the following commits:

8f97a3db [Bryan Cutler] added test for VarBinaryVector that checks lastSet after reading
70df0cc4 [Bryan Cutler] set lastSet in JsonFileReader and initialize lastSet for ListVector