Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21028#discussion_r186354007
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -530,6 +560,155 @@ case class ArrayContains(left: Expression, right:
Expression)
override def prettyName: String = "array_contains"
}
+/**
+ * Checks if the two arrays contain at least one common element.
+ */
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = "_FUNC_(a1, a2) - Returns true if a1 contains at least an
element present also in a2. If the arrays have no common element and either of
them contains a null element null is returned, false otherwise.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array(1, 2, 3), array(3, 4, 5));
+ true
+ """, since = "2.4.0")
+// scalastyle:off line.size.limit
+case class ArraysOverlap(left: Expression, right: Expression)
+ extends BinaryArrayExpressionWithImplicitCast {
+
+ override def dataType: DataType = BooleanType
+
+ override def nullable: Boolean = {
+ left.nullable || right.nullable ||
left.dataType.asInstanceOf[ArrayType].containsNull ||
+ right.dataType.asInstanceOf[ArrayType].containsNull
+ }
+
+ override def nullSafeEval(a1: Any, a2: Any): Any = {
+ var hasNull = false
+ val arr1 = a1.asInstanceOf[ArrayData]
+ val arr2 = a2.asInstanceOf[ArrayData]
+ val (biggestArr, smallestArr) = if (arr1.numElements() >
arr2.numElements()) {
+ (arr1, arr2)
+ } else {
+ (arr2, arr1)
+ }
+ if (smallestArr.numElements() > 0) {
+ val smallestSet = new mutable.HashSet[Any]
+ smallestArr.foreach(elementType, (_, v) =>
+ if (v == null) {
+ hasNull = true
+ } else {
+ smallestSet += v
+ })
+ biggestArr.foreach(elementType, (_, v1) =>
+ if (v1 == null) {
+ hasNull = true
+ } else if (smallestSet.contains(v1)) {
+ return true
+ }
+ )
+ } else if (containsNull(biggestArr,
right.dataType.asInstanceOf[ArrayType])) {
+ hasNull = true
+ }
+ if (hasNull) {
+ null
+ } else {
+ false
+ }
+ }
+
+ def containsNull(arr: ArrayData, dt: ArrayType): Boolean = {
+ if (dt.containsNull) {
+ arr.foreach(elementType, (_, v) =>
--- End diff --
```
var i = 0
var hasNull = false
while (i < arr.numElements && !hasNull) {
hasNull = arr.isNullAt(i)
i += 1
}
hasNull
```
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