Github user tarekauel commented on a diff in the pull request:
https://github.com/apache/spark/pull/7186#discussion_r33917806
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -211,6 +211,77 @@ case class EndsWith(left: Expression, right:
Expression)
}
/**
+ * A function that returns the index (1-based) of the given string (left)
in the comma-
+ * delimited list (right). Returns -1, if the string wasn't found and 0 if
the given
+ * string (left) contains a comma.
+ */
+case class FindInSet(left: Expression, right: Expression) extends
BinaryExpression
+ with ExpectsInputTypes {
+
+ override def checkInputDataTypes(): TypeCheckResult = {
+ (left.dataType, right.dataType) match {
+ case (_, NullType) | (NullType, _) | (StringType, StringType) =>
+ TypeCheckResult.TypeCheckSuccess
+ case _ =>
+ TypeCheckResult.TypeCheckFailure(s"FindInSet expects two strings
as argument, not " +
+ s"(${left.dataType}, ${right.dataType})")
+ }
+ }
+
+ override def inputTypes: Seq[Any] = Seq(StringType, StringType)
+
+ override def eval(input: InternalRow): Any = {
+ val valueLeft = left.eval(input)
+ if (valueLeft != null) {
+ val strLeft = valueLeft.asInstanceOf[UTF8String]
+ if (!strLeft.contains(UTF8String.fromString(","))) {
+ val valueRight = right.eval(input)
+ if (valueRight != null) {
+ val splits =
valueRight.asInstanceOf[UTF8String].toString.split(",")
+ var i = 0
--- End diff --
That's a good comment. My feeling is that we should implement a `split` or
`splitByString` method as part of `UTF8String`. (Could be a subtask of
https://issues.apache.org/jira/browse/SPARK-8829). @rxin what do you think?
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