Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/6843#discussion_r32844594
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -307,9 +307,176 @@ case class StringLength(child: Expression) extends
UnaryExpression with ExpectsI
if (string == null) null else string.asInstanceOf[UTF8String].length
}
- override def toString: String = s"length($child)"
+ override def toString: String = s"LENGTH($child)"
override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
defineCodeGen(ctx, ev, c => s"($c).length()")
}
}
+
+/**
+ * Returns the numeric value of the first character of str.
+ */
+case class Ascii(child: Expression) extends UnaryExpression {
+ override def dataType: DataType = IntegerType
+ override def checkInputDataTypes(): TypeCheckResult = {
+ if (child.dataType != StringType) {
+ TypeCheckResult.TypeCheckFailure(
+ s"type of child expression in ASCII should be string, not
${child.dataType}")
+ } else {
+ TypeCheckResult.TypeCheckSuccess
+ }
+ }
+
+ override def eval(input: InternalRow): Any = {
+ val string = child.eval(input)
+ if (string == null) {
+ null
+ } else {
+ val bytes = string.asInstanceOf[UTF8String].getBytes
+ if (bytes.length > 0) {
+ bytes(0).asInstanceOf[Int]
+ } else {
+ 0
+ }
+ }
+ }
+
+ override def toString: String = s"ASCII($child)"
+}
+
+/**
+ * Converts the argument from binary to a base 64 string.
+ */
+case class Base64(child: Expression) extends UnaryExpression {
+ override def dataType: DataType = StringType
+ override def checkInputDataTypes(): TypeCheckResult = {
+ if (child.dataType != BinaryType) {
+ TypeCheckResult.TypeCheckFailure(
+ s"type of child expression in BASE64 should be binary, not
${child.dataType}")
+ } else {
+ TypeCheckResult.TypeCheckSuccess
+ }
+ }
+
+ override def eval(input: InternalRow): Any = {
+ val bytes = child.eval(input)
+ if (bytes == null) {
+ null
+ } else {
+ UTF8String.fromBytes(
+ org.apache.commons.codec.binary.Base64.encodeBase64(
+ bytes.asInstanceOf[Array[Byte]]))
+ }
+ }
+
+ override def toString: String = s"BASE64($child)"
+}
+
+/**
+ * Converts the argument from a base 64 string to BINARY.
+ */
+case class UnBase64(child: Expression) extends UnaryExpression {
+ override def dataType: DataType = BinaryType
+ override def checkInputDataTypes(): TypeCheckResult = {
+ if (child.dataType != StringType) {
+ TypeCheckResult.TypeCheckFailure(
+ s"type of child expression in UNBASE64 should be string, not
${child.dataType}")
--- End diff --
Maybe we should simplify type checking code for single type restrict like
this one. Create a new `ExpectsInputTypes` is a good idea for me.
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