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
