cloud-fan commented on code in PR #37483:
URL: https://github.com/apache/spark/pull/37483#discussion_r959122998
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathExpressions.scala:
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@@ -1120,28 +1120,58 @@ case class Hex(child: Expression)
""",
since = "1.5.0",
group = "math_funcs")
-case class Unhex(child: Expression)
+case class Unhex(child: Expression, failOnError: Boolean = false)
extends UnaryExpression with ImplicitCastInputTypes with NullIntolerant {
+ def this(expr: Expression) = this(expr, false)
+
override def inputTypes: Seq[AbstractDataType] = Seq(StringType)
override def nullable: Boolean = true
override def dataType: DataType = BinaryType
- protected override def nullSafeEval(num: Any): Any =
- Hex.unhex(num.asInstanceOf[UTF8String].getBytes)
+ protected override def nullSafeEval(num: Any): Any = {
+ val result = Hex.unhex(num.asInstanceOf[UTF8String].getBytes)
+ if (failOnError && result == null) {
+ // The failOnError is set only from `ToBinary` function - hence we might
safely set `hint`
+ // parameter to `try_to_binary`.
Review Comment:
why not set the hint parameter to `to_binary`?
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