How many times does MaskedColumn need to be finalized? #6721
Description
I find this perplexing. I print a print statement in BaseColumn.__array_finalize__:
In [2]: c = Column([1,2], format='%d')
Finished array finalize (with copy attrs)
In [3]: c[:]
Finished array finalize (with copy attrs)
Out[3]:
<Column dtype='int64' format='%d' length=2>
1
2
In [4]: c = MaskedColumn([1,2], format='%d')
Finished array finalize (with copy attrs)
Finished array finalize (with copy attrs)
In [5]: c[:]
Finished array finalize (with copy attrs)
Finished array finalize (with copy attrs)
Finished array finalize (with copy attrs)
Out[5]: Finished array finalize (with copy attrs)
Finished array finalize (with copy attrs)
<MaskedColumn dtype='int64' format='%d' length=2>
1
2
This came up in working on #6720.