apache / apache/arrow

[C++][Arrow Flight SQL ODBC] MoveSingleCell Improvements

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Component: C++ Component: FlightRPC Type: enhancement
Dominant language
C++
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Description

### Describe the enhancement requested

AC:
- create different versions of `MoveSingleCell` depending on if `str_len_buffer` is null. Relevant place in code:

https://github.com/apache/arrow/blob/bab558061696ddc1841148d6210424b12923d48e/cpp/src/arrow/flight/sql/odbc/odbc_impl/accessors/types.h#L98-L111

- The goal is that `MoveSingleCell` should handle the `throw NullWithoutIndicatorException();` logic

Parent issue: https://github.com/apache/arrow/issues/30622

### Component(s)

C++, FlightRPC

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