LuciferYang commented on code in PR #38874:
URL: https://github.com/apache/spark/pull/38874#discussion_r1041852572
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala:
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@@ -4600,3 +4600,44 @@ case class ArrayExcept(left: Expression, right:
Expression) extends ArrayBinaryL
override protected def withNewChildrenInternal(
newLeft: Expression, newRight: Expression): ArrayExcept = copy(left =
newLeft, right = newRight)
}
+
+@ExpressionDescription(
+ usage = "_FUNC_(array) - Removes null values from the array.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array(1, 2, 3, null));
+ [1,2,3]
+ """,
+ group = "array_funcs",
+ since = "3.4.0")
+case class ArrayCompact(child: Expression)
+ extends UnaryExpression with ExpectsInputTypes with NullIntolerant {
+ override def inputTypes: Seq[AbstractDataType] = Seq(ArrayType)
+ override def dataType: DataType = child.dataType
+
+ @transient private lazy val elementType: DataType =
dataType.asInstanceOf[ArrayType].elementType
+
+ override def nullSafeEval(array: Any): Any = {
+ val newArray = new Array[Any](array.asInstanceOf[ArrayData].numElements())
+ var pos = 0
+ array.asInstanceOf[ArrayData].foreach (elementType, (i, v) =>
+ if (v != null ) {
+ newArray(pos) = v
+ pos += 1
+ }
+ )
+ new GenericArrayData(newArray.slice(0, pos))
+ }
+ override def prettyName: String = "array_compact"
+
+ override protected def doGenCode(ctx: CodegenContext, ev: ExprCode):
ExprCode = {
+
+ nullSafeCodeGen(ctx, ev, (array) => {
Review Comment:
nit: `(array)` -> `array`
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