vinodkc commented on code in PR #39577:
URL: https://github.com/apache/spark/pull/39577#discussion_r1080534998
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/maskExpressions.scala:
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@@ -207,6 +204,37 @@ case class Mask(
s"transformInput($input, $upperChar, $lowerChar, $digitChar,
$otherChar);"
})
+ /**
+ * Short hand for generating quinary evaluation code. If either of the
sub-expressions is null,
+ * the result of this computation is assumed to be null.
+ *
+ * @param f
+ * function that accepts the 5 non-null evaluation result names of
children and returns Java
+ * code to compute the output.
+ */
+ override protected def nullSafeCodeGen(
Review Comment:
nullSafeCodeGen here is an overridden implementation to allow nulls value
the input parameters (not filtering null values), null will be check later in
mask method.
If we put this special implementation in QuinaryExpression, future classes
extending QuinaryExpression will have to override it to handle null check.
That is why overriding nullSafeCodeGen here
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