Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21258#discussion_r192536842
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
---
@@ -235,6 +235,86 @@ case class CreateMap(children: Seq[Expression])
extends Expression {
override def prettyName: String = "map"
}
+/**
+ * Returns a catalyst Map containing the two arrays in children
expressions as keys and values.
+ */
+@ExpressionDescription(
+ usage = """
+ _FUNC_(keys, values) - Creates a map with a pair of the given
key/value arrays. All elements
+ in keys should not be null""",
+ examples = """
+ Examples:
+ > SELECT _FUNC_([1.0, 3.0], ['2', '4']);
+ {1.0:"2",3.0:"4"}
+ """, since = "2.4.0")
+case class CreateMapFromArrays(left: Expression, right: Expression)
+ extends BinaryExpression with ExpectsInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(ArrayType,
ArrayType)
+
+ override def checkInputDataTypes(): TypeCheckResult = {
+ (left.dataType, right.dataType) match {
+ case (ArrayType(_, _), ArrayType(_, _)) =>
+ TypeCheckResult.TypeCheckSuccess
+ case _ =>
+ TypeCheckResult.TypeCheckFailure("The given two arguments should
be an array")
+ }
+ }
+
+ override def dataType: DataType = {
+ MapType(
+ keyType = left.dataType.asInstanceOf[ArrayType].elementType,
+ valueType = right.dataType.asInstanceOf[ArrayType].elementType,
+ valueContainsNull =
right.dataType.asInstanceOf[ArrayType].containsNull)
+ }
+
+ override def nullable: Boolean = left.nullable || right.nullable
+
+ override def nullSafeEval(keyArray: Any, valueArray: Any): Any = {
+ val keyArrayData = keyArray.asInstanceOf[ArrayData]
+ val valueArrayData = valueArray.asInstanceOf[ArrayData]
+ if (keyArrayData.numElements != valueArrayData.numElements) {
+ throw new RuntimeException("The given two arrays should have the
same length")
+ }
+ val leftArrayType = left.dataType.asInstanceOf[ArrayType]
+ if (leftArrayType.containsNull) {
+ if (keyArrayData.toArray(leftArrayType.elementType).contains(null)) {
+ throw new RuntimeException("Cannot use null as map key!")
+ }
--- End diff --
We can use loop to null-check without converting to object array?
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