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[SPARK-4386] Improve performance when writing Parquet files.
If you profile the writing of a Parquet file, the single worst time consuming call inside of org.apache.spark.sql.parquet.MutableRowWriteSupport.write is actually in the scala.collection.AbstractSequence.size call. This is because the size call actually ends up COUNTING the elements in a scala.collection.LinearSeqOptimized.length ("optimized?"). This doesn't need to be done. "size" is called repeatedly where needed rather than called once at the top of the method and stored in a 'val'. Author: Jim Carroll <jim@dontcallme.com> Closes #3254 from jimfcarroll/parquet-perf and squashes the following commits: 30cc0b5 [Jim Carroll] Improve performance when writing Parquet files.
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