schema = "orderID INTEGER, customerID INTEGER, productID INTEGER, state STRING, 支付方式 STRING, totalAmt DOUBLE, invoiceTime TIMESTAMP" first_row_is_header = "True" delimiter = "," #将 CSV 文件读入 DataFrame df = spark.read.format(file_type) \ .schema(schema) \ .option("header", fi...
Let’s import thepyspark.sql.functions import splitand use thesplit()function with select() to split the string columnnameby comma delimiter and create an array. The select() method just returns the array column. # Import from pyspark.sql.functions import split, col # using split() df2 = ...
131 pyspark.sql.functions.split(str, pattern) 将模式分割(模式是正则表达式)。 注:pattern是一个字符串表示正则表达式。 >>> df = sqlContext.createDataFrame([('ab12cd',)], ['s',]) >>> df.select(split(df.s, '[0-9]+').alias('s')).collect() [Row(s=[u'ab', u'cd'])] 1. 2...
通过分析FileInputFormat里面的getSplits方法,可以得出,某一行记录同样也可能被划分到不同的InputSplit。 1. public List<InputSplit> getSplits(JobContext job) throws IOException { 2. long minSize = Math.max(getFormatMinSplitSize(), getMinSplitSize(job)); 3. long maxSize = getMaxSplitSize(job);...
# Give regex expression to split your string based on anticipated delimiters (this could be dangerous # if those delimiter occur as part of value. e.g.: 2021-12-31 is a single value in reality. # But this a price we have to pay for not having good data). ...
27.split对固定模式的字符串进行分割 28.substring指定起始位置，以及长度进行字符串截取 29.udf 自定义...
9.131 pyspark.sql.functions.split(str,pattern):New in version 1.5. 将模式分割(模式是正则表达式)。 注:pattern是一个字符串表示正则表达式。 >>> df=sqlContext.createDataFrame([('ab12cd',)],['s',]) >>> df.select(split(df.s,'[0-9]+').alias('s')).collect()[Row(s=[u'ab', u'cd...
sql_context=SQLContext(spark)gzfile=main_dir+'\\*.gz'%base_weeksc_file=spark.textFile(gzfile)csv=sc_file.map(lambdax:x.split("\t"))rows=csv.map(lambdap:Row(ID=p[0],Category=p[1],FIPS=p[2],date_idx=p[3]))All_device_list=sql_context.createDataFrame(rows) ...
OSEcur_account;END$delimiter$CREATEPROCEDUREmerge_a_to_b ()BEGIN--定义需要插入从a表插入b表的过程变量DECLARE_IDVARCHAR(16);DECLARE_NA MEVARCHAR(16);--游标遍历数据结束标志DECLAREdoneINTDEFAULTFALSE;--游 标指向a表结果集第一条-1位置DECLAREcur_accountCURSORFORSELECTID,NAMEFRO ...
PRIMARYKEY(id))PARTITIONBYRANGECOLUMNS(id)(PARTITIONp1VALUE SLESSTHAN(1000),PARTITIONp2VALUESLESSTHAN(2000),PARTITI ONp3VALUESLESSTHAN(3000));(接着创建存储过程,导入测试数据)DELIMITER//CREA TEPROCEDUREinsert_batch()beginDECLAREnumINT;SETnum=1;WHILEn ...