/** * Return a new RDD containing the distinct elements in this RDD. */defdistinct(numPartitions:Int)(implicit ord:Ordering[T]=null):RDD[T]=withScope{map(x=>(x,null)).reduceByKey((x,y)=>x,numPartitions).map(_._1)}//numPartitions:分区数 3.2 无参: 代码语言:javascript 代码运行次数...
ARRAY_DISTINCT,MaxCompute:Removes duplicate elements from Array a. array<T> array_distinct(array<T> )Parametersa: required. This parameter specifies an array. T in array<T> specifies the data type of...
// Scala program to print the // distinct elements of the array object Sample { def main(args: Array[String]) { var arr1 = Array(10, 23, 14, 16, 10, 14, 13, 60); var i: Int = 0; var arr2 = arr1.distinct; i = 0; println("Distinct elements of array: ") while (i <...
原因:distinct()依赖于equals() 查看distinct()的API,可以看到如下介绍: Returns a stream consisting of the distinct elements (according to {@link Object#equals(Object)}) of this stream. 显然,distinct()对对象进行去重时,是根据对象的equals()方法去处理的。如果我们的VideoInfo类不overrride超类Object的eq...
' Step through the elements in the array starting with the ' last element in the array. For i = UBound(TempArray) To 0 Step -1' Set MaxVal to the element in the array and save the ' index of this element as MaxIndex. MaxVal = TempArray(i) MaxIndex = i...
val line: RDD[Int] = sc.parallelize(array,2) line.distinct().foreach(x => println(x)) //输出的结果已经去重:1,2,3,4 } } 通过上面的代码可以看出,使用distinct以后,会对重复的元素进行去重。我们来看下源码 /** * Return a new RDD containing the distinct elements in this RDD. ...
Array<Generic> Unique elements in the Array.Examples Basic example fqlCopied! [1, 1, 2, 3, 3].distinct() [ 1, 2, 3 ] Enforce unique values in an Array field You can use array.distinct() in a check constraint with to enforce distinct values within a document’s Array field. For ...
An array of distinct elements. Note: In JavaScript, Integers return as Float instead of integers, for example 1 is 1.0.Examples The following example shows how to return an array of distinct elements from another array using IPL. MyArray = Distinct({"a", "a", "b", "b", "c"}); Lo...
2.0.x (branch REL2_0_STABLE) works on PostgreSQL 9.4+ and, in addition tocount_distinct, provides the following aggregate functions: count_distinct_elements(for counting distinct elements in arrays) array_agg_distinct(for aggregating distinct elements into an array) ...
ROUND(COUNT(view_50.amount_in)::NUMERIC/NULLIF(COUNT(view_50.amount_out)::NUMERIC,0),2)ASout_divide_in, 使用COLA / NULLIF(COLB,0)后, 如果 COLB 为0, 产生的输出就是NULL 空数组解析为默认值 使用jsonb_array_elements_text()可以将一个 JSONB 类型的列解析为多行 -- 这是一个和聚合背道而...