Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13990#discussion_r70431411
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
---
@@ -393,3 +394,84 @@ case class CreateNamedStructUnsafe(children:
Seq[Expression]) extends Expression
override def prettyName: String = "named_struct_unsafe"
}
+
+/**
+ * Creates a map after splitting the input text into key/value pairs using
delimeters
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(text[, pairDelim, keyValueDelim]) - Creates a map after
splitting the text " +
+ "into key/value pairs using delimiters. " +
+ "Default delimiters are ',' for pairDelim and ':' for keyValueDelim.",
+ extended = """ > SELECT _FUNC_('a:1,b:2,c:3',',',':');\n
map("a":"1","b":"2","c":"3") """)
+case class StringToMap(text: Expression, pairDelim: Expression,
keyValueDelim: Expression)
+ extends TernaryExpression {
+
+ def this(child: Expression, pairDelim: Expression) = {
+ this(child, pairDelim, Literal(":"))
+ }
+
+ def this(child: Expression) = {
+ this(child, Literal(","), Literal(":"))
+ }
+
+ override def children: Seq[Expression] = Seq(text, pairDelim,
keyValueDelim)
+
+ override def dataType: DataType = MapType(StringType, StringType,
valueContainsNull = false)
+
+ override def checkInputDataTypes(): TypeCheckResult = {
+ if (children.map(_.dataType).forall(_ == StringType)) {
+ TypeCheckResult.TypeCheckSuccess
+ } else {
+ TypeCheckResult.TypeCheckFailure(s"String To Map's all arguments
should be string literal.")
--- End diff --
we should also check the `foldable`
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