Serialize schema in InputSplit and pull upstream changes in #1557, 1564 #40
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Hive queries that spawn MR jobs will work after this change because:
1) Table schema in RecordReader is now read from the inputsplit
2) HiveSerde on mappers would use input config
Also added a test class which simulates linkedin's way of storing metadata and tests testcases written upstream such as testScanEmptyTable(), testScanTable(), testJoinTables()
cc: @shardulm94