Github user michalsenkyr commented on a diff in the pull request:
https://github.com/apache/spark/pull/16986#discussion_r120009967
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
---
@@ -652,6 +653,299 @@ case class MapObjects private(
}
}
+object CollectObjectsToMap {
+ private val curId = new java.util.concurrent.atomic.AtomicInteger()
+
+ /**
+ * Construct an instance of CollectObjects case class.
+ *
+ * @param keyFunction The function applied on the key collection
elements.
+ * @param keyInputData An expression that when evaluated returns a key
collection object.
+ * @param keyElementType The data type of key elements in the collection.
+ * @param valueFunction The function applied on the value collection
elements.
+ * @param valueInputData An expression that when evaluated returns a
value collection object.
+ * @param valueElementType The data type of value elements in the
collection.
+ * @param collClass The type of the resulting collection.
+ */
+ def apply(
+ keyFunction: Expression => Expression,
+ keyInputData: Expression,
+ keyElementType: DataType,
+ valueFunction: Expression => Expression,
+ valueInputData: Expression,
+ valueElementType: DataType,
+ collClass: Class[_]): CollectObjectsToMap = {
+ val id = curId.getAndIncrement()
+ val keyLoopValue = s"CollectObjectsToMap_keyLoopValue$id"
+ val keyLoopIsNull = s"CollectObjectsToMap_keyLoopIsNull$id"
--- End diff --
Yes. A key in `MapData` cannot be null. However, since the function takes
two `ArrayData`s as input, I figured that we shouldn't count on this
requirement being necessarily fulfilled. As `CollectObjectsToMap` is a class
separate from its usage in `ScalaReflection`, I tried to make it as generic and
as similar to `MapObjects` as possible, so it can be used elsewhere without
having to make sure additional preconditions are met.
It also produces a generic `Map` which has implementations that can support
null keys. Right now, the only check that prevents this is
[here](https://github.com/apache/spark/pull/16986/files/7af9b0625a245d34943b7192532c93f2aafac635#diff-e436c96ea839dfe446837ab2a3531f93R933).
If there is ever a need to support these kinds of `Map`s in the future, this
should make the job easier.
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