Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/7709#discussion_r35614581
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -284,6 +284,66 @@ case class EndsWith(left: Expression, right:
Expression)
}
/**
+ * A function translate any character in the `srcExpr` by a character in
`replaceExpr`.
+ * The characters in `replaceExpr` is corresponding to the characters in
`matchingExpr`.
+ * The translate will happen when any character in the string matching
with the character
+ * in the `matchingExpr`.
+ */
+case class StringTranslate(srcExpr: Expression, matchingExpr: Expression,
replaceExpr: Expression)
+ extends Expression with ImplicitCastInputTypes {
+
+ override def foldable: Boolean = srcExpr.foldable &&
matchingExpr.foldable && replaceExpr.foldable
+ override def nullable: Boolean = srcExpr.nullable ||
matchingExpr.nullable || replaceExpr.nullable
+
+ override def dataType: DataType = StringType
+
+ override def inputTypes: Seq[DataType] = Seq(StringType, StringType,
StringType)
+
+ override def children: Seq[Expression] = srcExpr :: matchingExpr ::
replaceExpr :: Nil
+
+ override def eval(input: InternalRow): Any = {
+ val srcEval = srcExpr.eval(input)
+ if (srcEval != null) {
+ val matchingEval = matchingExpr.eval(input)
+ if (matchingEval != null) {
--- End diff --
you can use nullSafeEval
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