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Prudhvi PorandlaBenjamin Kietzman
5b783fe3528
Prudhvi Porandla authored and Benjamin Kietzman committed 6a2a3de8c6f
ARROW-6344: [C++][Gandiva] Handle multibyte characters in substring function

Closes #5236 from pprudhvi/substr and squashes the following commits:

f6bf2e1b2 <Prudhvi Porandla> add utf8_length unittests for invalid inputs
61cec3906 <Prudhvi Porandla> compute in int64
6869ff572 <Prudhvi Porandla> O(1) space
6dda1c9d6 <Prudhvi Porandla> use malloc to create array
c3b3bc45e <Prudhvi Porandla> support multibyte chars in substring

Authored-by: Prudhvi Porandla <prudhvi.porandla@icloud.com>
Signed-off-by: Benjamin Kietzman <bengilgit@gmail.com>