:- Filter isnotnull(name#1641) : +- Scan ExistingRDD[age#1640L,name#1641] +- BroadcastExchange HashedRelationBroadcastMode(List(input[1, string, false]),false), [plan_id=1946] +- Filter isnotnull(name#1645) +- Scan ExistingRDD[height#1644L,name#1645] intersect 获取交集(去重) df1 ...
以下代码片段是数据框的一个快速示例: # spark is an existing SparkSessiondf = spark.read.json("examples/src/main/resources/people.json")# Displays the content of the DataFrame to stdoutdf.show()#+---+---+#| age| name|#+---+---+#+null|Jackson|#| 30| Martin|#| 19| Melvin|#+-...
schema = StructType([ StructField("user_id", StringType(), True), StructField("name", StringType(), True), StructField("age", IntegerType(), True), StructField("score", FloatType(), True) ]) empty_dataframes = spark.createDataFrame(spark.sparkContext.emptyRDD(), schema) 1. 2. 3...
ZZHPC resolves to a loopback address: 127.0.1.1; using 192.168.1.16 instead (on interface wlo1) 25/02/03 17:54:37 WARN Utils: Set SPARK_LOCAL_IP if you need to bind to another address :: loading settings :: url = jar:file:/home...
To de-duplicate rows, use distinct, which returns only the unique rows.Python Копирај df_unique = df_customer.distinct() Handle null valuesTo handle null values, drop rows that contain null values using the na.drop method. This method lets you specify if you want to drop rows...
Array.empty, null) val sharedConf = broadcastedHadoopConf.value.value lazy val footerFileMetaData = ParquetFileReader.readFooter(sharedConf, filePath, SKIP_ROW_GROUPS).getFileMetaData // Try to push down filters when filter push-down is enabled. ...
df.toJSON().first() '{"age":2,"name":"Alice"}' #从第一个不为null的column中获取内容 df.select( col("site"), col("query"), coalesce(col("COL1"), col("COL2")).alias("cat")) DataFrames Operation 我们可以对两个或多个DataFrame进行操作。
数据类型仍然必须是拼花文件中的数组(只是不能为null值)。 json: { "a":[], "b":[1,2], "c": "a string" } Expected output: a | b | c ["-"] | [1,2] | "a string" Current script: sc = SparkContext() glueContext = GlueContext(sc) ...
别家工程师也不让改，导致本来想pyspark环境跑一个随机森林，用 《Comprehensive Introduction to Apache ...
17.isnan，isnull 检测是否为空 18.last指定列的最后一个值 19.max，mean，min最大值，最小值，...