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Prudhvi PorandlaFrançois Saint-Jacques
f836c741b8e
Prudhvi Porandla authored and François Saint-Jacques committed 478c3963a1b
ARROW-7000: [C++][Gandiva] Handle empty inputs in string upper, lower functions

Closes #5737 from pprudhvi/lower and squashes the following commits:

2f36bca3d <Prudhvi Porandla> add unittest with utf8 chars
04eff6159 <Prudhvi Porandla> add lower

Authored-by: Prudhvi Porandla <prudhvi.porandla@icloud.com>
Signed-off-by: François Saint-Jacques <fsaintjacques@gmail.com>