[jira] [Created] (CARBONDATA-318) Implement an ExternalSorter that makes maximum usage of memory while sorting

["Jacky Li (JIRA)" <ji...@apache.org>]

Jacky Li created CARBONDATA-318:
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             Summary: Implement an ExternalSorter that makes maximum usage of memory while sorting
                 Key: CARBONDATA-318
                 URL: https://issues.apache.org/jira/browse/CARBONDATA-318
             Project: CarbonData
          Issue Type: Sub-task
            Reporter: Jacky Li


External Sorter should sort in memory until it reach configured size, then spill to disk. It should provide following interface:
1. insertRow/insertRowBatch: insert rows into the sorter
2. getIterator: return an iterator that iterate on sorted rows

External Sorter depends on FileWriterFactory to get a FileWriter to spill data into files. FileWriterFactory should be provided by user. Multiple implementations are possible, like writing into one folder or multiple folder



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