Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/6843#discussion_r32714235
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -313,3 +313,131 @@ case class StringLength(child: Expression) extends
UnaryExpression with ExpectsI
defineCodeGen(ctx, ev, c => s"($c).length()")
}
}
+
+/**
+ * Returns the numeric value of the first character of str.
+ */
+case class Ascii(child: Expression) extends UnaryExpression with
ExpectsInputTypes {
+ override def dataType: DataType = IntegerType
+ override def expectedChildTypes: Seq[DataType] = Seq(StringType)
+
+ override def eval(input: InternalRow): Any = {
+ val string = child.eval(input)
+ if (string == null) {
+ null
+ } else {
+ val bytes = string.asInstanceOf[UTF8String].getBytes
+ if (bytes.length > 0) {
+ bytes(0).asInstanceOf[Int]
+ } else {
+ 0
+ }
+ }
+ }
+
+ override def toString: String = s"ascii($child)"
+}
+
+/**
+ * Converts the argument from binary to a base 64 string.
+ */
+case class Base64(child: Expression) extends UnaryExpression with
ExpectsInputTypes {
+ override def dataType: DataType = StringType
+ override def expectedChildTypes: Seq[DataType] = Seq(BinaryType)
--- End diff --
we should override `checkInputTypes` here, as `expectsInputType` won't
report type check error...
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