Thanks Rok!
Original question is to asking for a way to "verify if a cast if zero copy
by read source code / documentation", and not "verify a cast if zero copy
programmatically" but I noticed by reading the test file that int64 to
micro is indeed zero copy and I expect nanos to be the same
https:
For scalar casting tests we use CheckCastZeroCopy [1] which you could reuse.
[1]
https://github.com/apache/arrow/blob/e7d6c13d4ae3d8df0e9b668468b990f35c8a9556/cpp/src/arrow/compute/kernels/scalar_cast_test.cc#L128-L138
Rok
