[SPARK-10339] [SPARK-10334] [SPARK-10301] [SQL]Partitioned table scan can OOM driver and throw a better error message when users need to enable parquet schema merging#8515

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yhuai:partitionedTableScan

Commits on Aug 28, 2015

Only create a single Filter/Project for partitioned table scan instead of create one Filter/Project for every partition.
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Throw an exception if parquet file's schema has different number of fields with the table schema.
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Commits on Aug 29, 2015

Add test.
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