Github user NarineK commented on the pull request:
https://github.com/apache/spark/pull/9680#issuecomment-156372445
in R the general formula for correlation is the following:
cor(x, y = NULL, use = "everything", method = c("pearson", "kendall",
"spearman"))
in #9366 is the special case when x = y, but in general x and y are 2
different dataframes with the same number of rows.
I did the pull request specifically for x = y, but the jira is more general.
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