例子: sparkR.session()listColumns( 本文由纯净天空筛选整理自spark.apache.org大神的英文原创作品Returns a list of columns for the given table/view in the specified database。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。
getRowDatasList()) { if (eventType == EventType.DELETE) { printColumn(rowData.getBeforeColumnsList()); } else if (eventType == EventType.INSERT) { printColumn(rowData.getAfterColumnsList()); } else { System.out.println("---> before"); printColumn(rowData.getBeforeColumnsList()...
valspark:SparkSession=...spark.streams.active// get the list of currently active streaming queriesspark.streams.get(id)// get a query object by its unique idspark.streams.awaitAnyTermination()// block until any one of them terminates 监控Streaming Queries 有两个用于 monitoring and debugging act...
parallelize(list); private val rootDomain = conf def getResult(): Array[(String)] = { val result = rdd.filter(item => item.contains(rootDomain)) result.take(result.count().toInt) } } 注解是方法级别的,不是变量级别。 方法实现implements Serializable 例如: 代码语言:javascript 代码运行次数:...
print('Initializing the construction of heatmaps for every day.') ct = 0 for this_day in dates_list: # The conversion of the required columns into a Pandas df is necessary to perform the mapping day_df = df.filter(F.col('date') == this_day).select(["iso_code","total_cases"])...
columnName = alias.getName(); }if(!result.contains(columnName)) { result.add(columnName); } }elseif(selectItem instanceof AllTableColumns) { allTableColumns = (AllTableColumns) selectItemlist.get(i);if(!result.contains(allTableColumns.toString())) { ...
创建SparkSession val spark: SparkSession = SparkSession.builder().master("local[*]").appName("SparkSQL").getOrCreate() val sc: SparkContext = spark.sparkContext sc.setLogLevel("WARN") //2.读取文件 val fileRDD: RDD[String] = sc.textFile("D:\\data\\person.txt") val linesRDD: RDD...
checkpoint Not part of Spark Connect coalesce colRegex collect columns corr count cov createGlobalTempView createOrReplaceGlobalTempView createOrReplaceTempView createTempView crossJoin crosstab cube describe distinct drop dropDuplicatesWithinWatermark drop_duplicates dropna dtypes ...
StreamExecutionEnvironment.getExecutionEnvironment(); //设置并行度,为了方便测试,查看消息的顺序,这里设置为1,可以更改为多并行度 env.setParallelism(1); //checkpoint的设置 //每隔10s进行启动一个检查点【设置checkpoint的周期】 env.enableCheckpointing(30000); //设置模式为:exactly_one,仅一次语义 env.get...
When true, the ordinal numbers are treated as the position in the select list. When false, the ordinal numbers in order/sort by clause are ignored. spark.sql.parquet.binaryAsString FALSE Some other Parquet-producing systems, in particular Impala and older versions of Spark SQL, do not differe...