Filtering a struct array with no fields returns incorrect length #7447
Description
Describe the bug
Calling arrow_select filter over a struct array with no fields always returns an array of length zero.
To Reproduce
As above.
Expected behavior
Length should be equal to true-count of the mask.
Additional context
This is yet another example of bugs caused from struct array defaulting length to zero. I strongly think we should change these APIs and absorb the disruption.
This function call is incorrect and should pass the length as true-count:
arrow-rs/arrow-select/src/filter.rs
Lines 837 to 839 in 07093a4