Github user kiszk commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21208#discussion_r187872304
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
 ---
    @@ -1468,3 +1468,149 @@ case class Flatten(child: Expression) extends 
UnaryExpression {
     
       override def prettyName: String = "flatten"
     }
    +
    +/**
    + * Returns the array containing the given input value (left) count (right) 
times.
    + */
    +@ExpressionDescription(
    +  usage = "_FUNC_(element, count) - Returns the array containing element 
count times.",
    +  examples = """
    +    Examples:
    +      > SELECT _FUNC_('123', 2);
    +       ['123', '123']
    +  """)
    +case class ArrayRepeat(left: Expression, right: Expression)
    +  extends BinaryExpression with ExpectsInputTypes {
    +
    +  private val MAX_ARRAY_LENGTH = ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH
    +
    +  override def dataType: ArrayType = ArrayType(left.dataType, 
left.nullable)
    +
    +  override def inputTypes: Seq[AbstractDataType] = Seq(AnyDataType, 
IntegerType)
    +
    +  override def nullable: Boolean = right.nullable
    +
    +  override def eval(input: InternalRow): Any = {
    +    val count = right.eval(input)
    +    if (count == null) {
    +      null
    +    } else {
    +      if (count.asInstanceOf[Int] > MAX_ARRAY_LENGTH) {
    +        throw new RuntimeException(s"Unsuccessful try to create array with 
$count elements" +
    +          s"due to exceeding the array size limit $MAX_ARRAY_LENGTH.");
    +      }
    +      val element = left.eval(input)
    +      new GenericArrayData(Array.fill(count.asInstanceOf[Int])(element))
    +    }
    +  }
    +
    +  override def prettyName: String = "array_repeat"
    +
    +  override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
    +
    +    val leftGen = left.genCode(ctx)
    +    val rightGen = right.genCode(ctx)
    +    val element = leftGen.value
    +    val count = rightGen.value
    +    val et = dataType.elementType
    +
    +    val coreLogic = if (CodeGenerator.isPrimitiveType(et)) {
    +      genCodeForPrimitiveElement(ctx, et, element, count, leftGen.isNull, 
ev.value)
    +    } else {
    +      genCodeForNonPrimitiveElement(ctx, element, count, leftGen.isNull, 
ev.value)
    +    }
    +    val resultCode = nullElementsProtection(ev, rightGen.isNull, coreLogic)
    +
    +    ev.copy(code =
    +      s"""
    +      |boolean ${ev.isNull} = false;
    +      |${leftGen.code}
    +      |${rightGen.code}
    +      |${CodeGenerator.javaType(dataType)} ${ev.value} = 
${CodeGenerator.defaultValue(dataType)};
    +      |$resultCode
    +      """.stripMargin)
    +  }
    +
    +  private def nullElementsProtection(ev: ExprCode,
    +                                     rightIsNull: String,
    --- End diff --
    
    nit: indents


---

---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org

Reply via email to