Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/13990#discussion_r69678271
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
---
@@ -393,3 +393,64 @@ 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 with ExpectsInputTypes {
+
+ def this(child: Expression) = {
+ this(child, Literal(","), Literal("="))
+ }
+
+ override def children: Seq[Expression] = Seq(text, pairDelim,
keyValueDelim)
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(StringType,
StringType, StringType)
+
+ override def dataType: DataType = MapType(StringType, StringType,
valueContainsNull = false)
+
+ override def nullSafeEval(str: Any, delim1: Any, delim2: Any): Any = {
+ val array = str.asInstanceOf[UTF8String]
+ .split(delim1.asInstanceOf[UTF8String], -1)
+ .map{_.split(delim2.asInstanceOf[UTF8String], 2)}
+
+ ArrayBasedMapData(array.map(_(0)), array.map(_(1)))
+ }
+
+ override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
+
+ nullSafeCodeGen(ctx, ev, (text, pairDelim, keyValueDelim) => {
+ val arrayClass = classOf[GenericArrayData].getName
+ val mapClass = classOf[ArrayBasedMapData].getName
+
+ val keyArray = ctx.freshName("keyArray")
+ val valueArray = ctx.freshName("valueArray")
+ val tempArray = ctx.freshName("tempArray")
+ val keyValue = ctx.freshName("keyValue")
+ val i = ctx.freshName("i")
+
+ s"""
+ UTF8String[] $tempArray = ($text).split($pairDelim, -1);
+
+ UTF8String[] $keyArray = new UTF8String[$tempArray.length];
+ UTF8String[] $valueArray = new UTF8String[$tempArray.length];
+
+ for (int $i = 0; $i < $tempArray.length; $i ++) {
--- End diff --
`$i++` ?
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