Minor Description
We introduced SQL option "spark.sql.parquet.followParquetFormatSpec" while working on implementing Parquet backwards-compatibility rules in SPARK-6777. It indicates whether we should use legacy Parquet format adopted by Spark 1.4 and prior versions or the standard format defined in parquet-format spec. However, the name of this option is somewhat confusing, because it's not super intuitive why we shouldn't follow the spec. Would be nice to rename it to "spark.sql.parquet.writeLegacyFormat" and invert its default value (they have opposite meanings). Note that this option is not "public" (isPublic is false).
At the moment of writing, 1.5 RC3 has already been cut. If we can't make this one into 1.5, we can deprecate the old option with the new one.
