Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/23184#discussion_r238055143
--- Diff: R/pkg/R/functions.R ---
@@ -2254,40 +2255,48 @@ setMethod("date_format", signature(y = "Column", x
= "character"),
column(jc)
})
+setClassUnion("characterOrstructTypeOrColumn", c("character",
"structType", "Column"))
--- End diff --
we should probably try to pull all the setClassUnion in one place. (to
avoid conflict or duplication)
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