panbingkun commented on code in PR #41534:
URL: https://github.com/apache/spark/pull/41534#discussion_r1230509831
##########
sql/core/src/main/scala/org/apache/spark/sql/functions.scala:
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@@ -6229,6 +6229,71 @@ object functions {
Bucket(Literal(numBuckets), e.expr)
}
+
//////////////////////////////////////////////////////////////////////////////////////////////
+ // Predicates functions
+
//////////////////////////////////////////////////////////////////////////////////////////////
+
+ /**
+ * Returns `col2` if `col1` is null, or `col1` otherwise.
+ *
+ * @group predicates_funcs
+ * @since 3.5.0
+ */
+ def ifnull(col1: Column, col2: Column): Column = withExpr {
Review Comment:
According to my understanding, 'replacement: Expression' is only an internal
Spark mechanism that exists to cooperate with 'RuntimeReplaceable' and is
designed to reuse expressions. I guess it is actually not needed in our
function.
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