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From "Zhichao Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CARBONDATA-1625) Introduce new datatype of varchar(size) to store column length more than short limit.
Date Thu, 26 Oct 2017 09:55:00 GMT
Zhichao  Zhang created CARBONDATA-1625:
------------------------------------------

             Summary: Introduce new datatype of  varchar(size) to store column length more
than short limit.
                 Key: CARBONDATA-1625
                 URL: https://issues.apache.org/jira/browse/CARBONDATA-1625
             Project: CarbonData
          Issue Type: New Feature
          Components: file-format
            Reporter: Zhichao  Zhang
            Priority: Minor


I am using Spark 2.1 + CarbonData 1.2, and find that if 
enable.unsafe.sort=true, the length of bytes of column exceed 32768, it will 
load data unsuccessfully. 

My test code: 
    val longStr = sb.toString()  // the getBytes length of longStr exceeds 32768 
    println(longStr.length()) 
    println(longStr.getBytes("UTF-8").length) 
    
    import spark.implicits._ 
    val df1 = spark.sparkContext.parallelize(0 to 1000) 
      .map(x => ("a", x.toString(), longStr, x, x.toLong, x * 2)) 
      .toDF("stringField1", "stringField2", "stringField3", "intField", 
"longField", "int2Field") 
      
    val df2 = spark.sparkContext.parallelize(1001 to 2000) 
      .map(x => ("b", x.toString(), (x % 2).toString(), x, x.toLong, x * 2)) 
      .toDF("stringField1", "stringField2", "stringField3", "intField", 
"longField", "int2Field") 
      
    val df3 = df1.union(df2) 
    val tableName = "study_carbondata_test" 
    spark.sql(s"DROP TABLE IF EXISTS ${tableName} ").show() 
    val sortScope = "LOCAL_SORT"   // LOCAL_SORT   GLOBAL_SORT 
    spark.sql(s""" 
        |  CREATE TABLE IF NOT EXISTS ${tableName} ( 
        |    stringField1          string, 
        |    stringField2          string, 
        |    stringField3          string, 
        |    intField              int, 
        |    longField             bigint, 
        |    int2Field             int 
        |  ) 
        |  STORED BY 'carbondata' 
        |  TBLPROPERTIES('DICTIONARY_INCLUDE'='stringField1, stringField2', 
        |    'SORT_COLUMNS'='stringField1, stringField2, intField, 
longField', 
        |    'SORT_SCOPE'='${sortScope}', 
        |    'NO_INVERTED_INDEX'='stringField3, int2Field', 
        |    'TABLE_BLOCKSIZE'='64' 
        |  ) 
       """.stripMargin) 
    df3.write 
      .format("carbondata")   
      .option("tableName", "study_carbondata_test") 
      .option("compress", "true")  // just valid when tempCSV is true 
      .option("tempCSV", "false") 
      .option("single_pass", "true") 
      .mode(SaveMode.Append) 
      .save()

The error message: 
*java.lang.NegativeArraySizeException 
        at 
org.apache.carbondata.processing.newflow.sort.unsafe.UnsafeCarbonRowPage.getRow(UnsafeCarbonRowPage.java:182)

        at 
org.apache.carbondata.processing.newflow.sort.unsafe.holder.UnsafeInmemoryHolder.readRow(UnsafeInmemoryHolder.java:63)

        at 
org.apache.carbondata.processing.newflow.sort.unsafe.merger.UnsafeSingleThreadFinalSortFilesMerger.startSorting(UnsafeSingleThreadFinalSortFilesMerger.java:114)

        at 
org.apache.carbondata.processing.newflow.sort.unsafe.merger.UnsafeSingleThreadFinalSortFilesMerger.startFinalMerge(UnsafeSingleThreadFinalSortFilesMerger.java:81)

        at 
org.apache.carbondata.processing.newflow.sort.impl.UnsafeParallelReadMergeSorterImpl.sort(UnsafeParallelReadMergeSorterImpl.java:105)

        at 
org.apache.carbondata.processing.newflow.steps.SortProcessorStepImpl.execute(SortProcessorStepImpl.java:62)

        at 
org.apache.carbondata.processing.newflow.steps.DataWriterProcessorStepImpl.execute(DataWriterProcessorStepImpl.java:87)

        at 
org.apache.carbondata.processing.newflow.DataLoadExecutor.execute(DataLoadExecutor.java:51)

        at 
org.apache.carbondata.spark.rdd.NewDataFrameLoaderRDD$$anon$2.<init>(NewCarbonDataLoadRDD.scala:442)

        at 
org.apache.carbondata.spark.rdd.NewDataFrameLoaderRDD.internalCompute(NewCarbonDataLoadRDD.scala:405)

        at 
org.apache.carbondata.spark.rdd.CarbonRDD.compute(CarbonRDD.scala:62) 
        at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323) 
        at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)* 

Currently, the length of column was stored by short type.

Introduce new datatype of  varchar(size) to store column length more than short limit.



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