Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12373#discussion_r59813149
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -1015,6 +1015,33 @@ object functions {
def nanvl(col1: Column, col2: Column): Column = withExpr {
NaNvl(col1.expr, col2.expr) }
/**
+ * Returns null if col1 equals to col2, otherwise returns col1.
+ *
+ * @group normal_funcs
+ * @since 2.0.0
+ */
+ def nullif(col1: Column, col2: Column): Column = withExpr {
NullIf(col1.expr, col2.expr)}
+
+ /**
+ * Returns col2 if col1 equals is null, otherwise returns col1.
+ *
+ * @group normal_funcs
+ * @since 2.0.0
+ */
+ def nvl(col1: Column, col2: Column): Column = withExpr { Nvl(col1.expr,
col2.expr)}
+ def ifnull(col1: Column, col2: Column): Column = withExpr {
Nvl(col1.expr, col2.expr)}
--- End diff --
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