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Prudhvi PorandlaPindikura Ravindra
8cdf567480c
Prudhvi Porandla authored and Pindikura Ravindra committed 9c147392514
ARROW-6034: [C++][Gandiva] Add string functions in Gandiva

Add following functions in Gandiva:
substr(str, offset, len), substr(str, offset), concat(str1, str2), castVARCHAR(timestamp, len), convert_fromUTF8(binary)

Closes #4942 from pprudhvi/utf8-funcs and squashes the following commits:

f88773ece <Prudhvi Porandla> add len 0 substr unittest
3900f8e8d <Prudhvi Porandla> static cast size_t to int32
208224119 <Prudhvi Porandla> add convert_fromUTF8 method
112c933cf <Prudhvi Porandla> add castVARCHAR(timestamp) method
77d3cdd0d <Prudhvi Porandla> add concatOperator
9e2623fa1 <Prudhvi Porandla> add unittests for substr
48c4d0823 <Prudhvi Porandla> add substr methods

Authored-by: Prudhvi Porandla <prudhvi.porandla@icloud.com>
Signed-off-by: Pindikura Ravindra <ravindra@dremio.com>