Github user saucam commented on the pull request:
https://github.com/apache/spark/pull/4246#issuecomment-91996558
hey @marmbrus , this property is needed because :
1. The 'hijacked' parquet read path would not use mapreduce property while
reading schema/footers,
see refresh method in ParquetRelation2.scala
2. HiveTableScan would need the pathfilter while creating RDD
see makeRDDForPartitionedTable in TableReader.scala
These are not using the mapreduce.input.pathFilter (even if its is set by
the user) property and hence the extra code.
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