Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Investigate where column names are initialized and whether is it possible to 
get them NULLs. The array of column names is filled with NULLs when initialized 
and later it is filled with references to strings. I am wondering whether there 
is a gap between this which lefts some column names as NULLs.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43251>
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