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ARROW-9554: [Java] FixedWidthInPlaceVectorSorter sometimes produces wrong result

See https://issues.apache.org/jira/browse/ARROW-9554

Closes #7837 from liyafan82/fly_0727_st

Authored-by: liyafan82 <fan_li_ya@foxmail.com>
Signed-off-by: liyafan82 <fan_li_ya@foxmail.com>