Hi,

Gandiva trusty job(https://travis-ci.org/ursa-labs/crossbow/builds/582833123) 
is failing with this commit (ARROW-6326: [C++] Nullable fields when converting 
std::tuple to Table  
<https://github.com/apache/arrow/commit/d6bc0b6f5975304367000e3090e09d4cf8af1fb9>).
The compilation is successful if the optional string column is removed from 
boost_optional_types_tuple(see line 36 of cpp/src/arrow/stl_test.cc).

Could someone help me understand this error?


Thanks,
Prudhvi


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