我们在查看的时候,可以看另外一个属性:configuration.get("parquet.private.read.filter.predicate.human.readable") = "and(noteq(id1, null), eq(id1, 4))".参考代码: org.apache.parquet.hadoop.ParquetInputFormat 的setFilterPredicate()和
def distinct(numPartitions: Int)(implicit ord: Ordering[T] = null): RDD[T] = withScope { def removeDuplicatesInPartition(partition: Iterator[T]): Iterator[T] = { // Create an instance of external append only map which ignores values. val map = new ExternalAppendOnlyMap[T, Null, Null](...
If you are coming from SQL background, you must be familiar withlikeandrlike(regex like). PySpark also provides similar methods in the Column class to filter similar values using wildcard characters. You can use rlike() for case insensitive. # Prepare Data data2 = [(2,"Michael Rose"),(...
PySpark Erweiterungen PySpark transformiert GlueTransform ApplyMapping DropFields DropNullFields ErrorsAsDynamicFrame EvaluateDataQuality FillMissingValues Filter FindIncrementalMatches FindMatches FlatMap Join Zuordnung MapToCollection Relationalize RenameField ResolveChoice SelectFields SelectFromCollection simplify_DDB...
dataframe pyspark 多个action pyspark处理dataframe 文章目录1、--- 查 --- 1.1 行元素查询操作 ---**像SQL那样打印列表前20元素***以树的形式打印概要***获取头几行到本地:***查询总行数:**取别名**查询某列为null的行:***输出list类型,list中每个元素是Row类:**查询概况去重set操作随机抽样--- 1.2...