Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14597
OK, makes sense @avulanov though I'm not sure why the model can't sort the
indices if it requires this as an internal detail. No big deal. After this
change it may not matter. Conceptually though, the output of chi-squared
feature selection does certainly imply an ordering because it computes a
p-value for each feature. It's useful info and there's a use for it here now.
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