[jira] [Created] (CARBONDATA-1508) Fixed bug for maintaining compatibility of decimal type with older releases of Carbondata

[Akash R Nilugal (Jira)]

Manish Gupta created CARBONDATA-1508:
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             Summary: Fixed bug for maintaining compatibility of decimal type with older releases of Carbondata
                 Key: CARBONDATA-1508
                 URL: https://issues.apache.org/jira/browse/CARBONDATA-1508
             Project: CarbonData
          Issue Type: Bug
            Reporter: Manish Gupta
            Assignee: Manish Gupta
             Fix For: 1.2.0


In old Carbondata releases, precision and scale is not stored for decimal data type and both values are initialized to -1. In TableSpec.ColumnSpec  default values for precision and scale are initialized to 0 because of which exception is thrown while reading the old store with decimal column. Exception trace

Caused by: java.lang.ClassCastException: [B cannot be cast to java.lang.Long
        at org.apache.carbondata.core.metadata.datatype.DecimalConverterFactory$DecimalIntConverter.getDecimal(DecimalConverterFactory.java:98)
        at org.apache.carbondata.core.datastore.page.UnsafeDecimalColumnPage.getDecimal(UnsafeDecimalColumnPage.java:260)
        at org.apache.carbondata.core.datastore.page.LazyColumnPage.getDecimal(LazyColumnPage.java:111)
        at org.apache.carbondata.core.scan.result.vector.MeasureDataVectorProcessor$DecimalMeasureVectorFiller.fillMeasureVector(MeasureDataVectorProcessor.java:215)
        at org.apache.carbondata.core.scan.result.AbstractScannedResult.fillColumnarMeasureBatch(AbstractScannedResult.java:257)
        at org.apache.carbondata.core.scan.collector.impl.DictionaryBasedVectorResultCollector.scanAndFillResult(DictionaryBasedVectorResultCollector.java:164)
        at org.apache.carbondata.core.scan.collector.impl.DictionaryBasedVectorResultCollector.collectVectorBatch(DictionaryBasedVectorResultCollector.java:155)
        at org.apache.carbondata.core.scan.processor.impl.DataBlockIteratorImpl.processNextBatch(DataBlockIteratorImpl.java:65)
        at org.apache.carbondata.core.scan.result.iterator.VectorDetailQueryResultIterator.processNextBatch(VectorDetailQueryResultIterator.java:46)
        at org.apache.carbondata.spark.vectorreader.VectorizedCarbonRecordReader.nextBatch(VectorizedCarbonRecordReader.java:258)
        at org.apache.carbondata.spark.vectorreader.VectorizedCarbonRecordReader.nextKeyValue(VectorizedCarbonRecordReader.java:145)
        at org.apache.carbondata.spark.rdd.CarbonScanRDD$$anon$1.hasNext(CarbonScanRDD.scala:246)



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