This function is used to return the length of a string. Similar function: lengthb. The lengthb function is used to return the length of string str in bytes and return a value of the STRING type. Syntax length(s
def main(args: Array[String]) { if (args.length != 3) { System.err.println("Usage: <filename> <port> <millisecond>") System.exit(1) } val fileName = args(0) val lines = Source.fromFile(fileName).getLines.toList val rowCount = lines.length val listener = new ServerSocket(args(...
SSparkSQLS parkSQ parkSQLS SSparkSQ 补足函数:lpad \ rpad lpad(str, len[, pad]) - Returns str, left-padded with pad to a length of len. If str is longer than len, the return value is shortened to len characters or bytes. If pad is not specified, str will be padded to the lef...
Dataset, Row, SparkSession} import org.apache.spark.{SparkConf, SparkContext} case class User(id:Int,name:String,age:Int) /** * @作者:袁哥 * @时间:2021/6/7 19:19 */ object TestSparkSQL { def main(args: Array[String]): Unit = { //创建上下文,配置环境变量 val ...
sql.{Encoder, Encoders, SparkSession} import org.apache.spark.sql.expressions.Aggregator case class Employee(name: String, salary: Long) case class Average(var sum: Long, var count: Long) object MyAverage extends Aggregator[Employee, Average, Double] { // A zero value for this aggregation. ...
--Spark Sql selectinitcap("spaRk sql");--SPARKSQLselectupper("sPark sql");--spark sql selectlower("Spark Sql"); 7. length 返回字符串的长度。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 --返回4selectlength("Hive"); 8. lpad / rpad ...
-- SPARK SQL select upper("sPark sql"); -- spark sql select lower("Spark Sql"); 7. length 返回字符串的长度。 -- 返回4 select length("Hive"); 8. lpad / rpad 返回固定长度的字符串,如果长度不够,用某种字符进行补全。 lpad(str, len, pad):左补全 ...
length(string1):返回字符串长度 concat(string1,string2):返回拼接string1及string2后的字符串 concat_ws(sep,string1,string2):返回按指定分隔符拼接的字符串 lower(string1):返回小写字符串,同lcase(string1)。upper()/ucase():返回大写字符串 trim(string1):去字符串左右空格,ltrim(string1):去字符串左空...
initcap(str) - Returnsstrwith the first letter of each word in uppercase. All other letters are in lowercase. Words are delimited by white space. Examples:> SELECT initcap('sPark sql');Spark Sql 7.length返回字符串的长度 Examples:> SELECT length('Spark SQL ');10 ...
keyvalue(string <str>,[string <split1>,string <split2>,] string <key>) STRING Splits str by split1, converts each group into a key-value pair by split2, and returns the value corresponding to the key. length length(string <str>) BIGINT Returns the length of a string. lengthb leng...