Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/22784
Can I clarify the description?
> Because we are passing an array of size n*(n+1)/2 to the breeze library
and the size cannot be more than INT_MAX. so, the maximum column size we can
give is 65,500.
If n > 20726, `n*(n+1)/2` > 214783647 ( = INT_MAX)`. Where does `65,500`
come from?
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