hyukjinkwon 7580f3041a [SPARK-16104] [SQL] Do not creaate CSV writer object for every flush when writing ... ## What changes were proposed in this pull request? This PR let `CsvWriter` object is not created for each time but able to be reused. This way was taken after from JSON data source. Original `CsvWriter` was being created for each row but it was enhanced in https://github.com/apache/spark/pull/13229. However, it still creates `CsvWriter` object for each `flush()` in `LineCsvWriter`. It seems it does not have to close the object and re-create this for every flush. It follows the original logic as it is but `CsvWriter` is reused by reseting `CharArrayWriter`. ## How was this patch tested? Existing tests should cover this. Author: hyukjinkwon <gurwls223@gmail.com> Closes #13809 from HyukjinKwon/write-perf.		2016-06-21 21:58:38 -07:00
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main	[SPARK-16104] [SQL] Do not creaate CSV writer object for every flush when writing	2016-06-21 21:58:38 -07:00
test	[SPARK-16002][SQL] Sleep when no new data arrives to avoid 100% CPU usage	2016-06-21 12:42:49 -07:00