Unify the logic for column pruning, projection, and filtering of table scans.#213

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marmbrus wants to merge 3 commits intoapache:masterfrom

marmbrus:strategyCleanup

Commits on Mar 25, 2014

Unify the logic for column pruning, projection, and filtering of table scans for both Hive and Parquet relations. Fix tests now that we are doing a better job of column pruning.
marmbrus
committed
Address comments.
marmbrus
committed
Move one more bit of parquet stuff into the core SQLContext.
marmbrus
committed