Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6107#discussion_r30278058
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -330,6 +330,11 @@ object functions {
def coalesce(e: Column*): Column = Coalesce(e.map(_.expr))
/**
+ * Creates a new row for each element in the given array or map column.
--- End diff --
add @since tag
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