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[SPARK-21271][SQL] Ensure Unsafe.sizeInBytes is a multiple of 8 - #18503

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[SPARK-21271][SQL] Ensure Unsafe.sizeInBytes is a multiple of 8#18503
kiszk wants to merge 10 commits into
apache:masterfrom
kiszk:SPARK-21271

Commits on Jul 2, 2017
- insert assert to ensure Unsafe.sizeInBytes is a multiple of 8
  kiszk
  committed
  eb87c63
- fix in ExternalSorter
  kiszk
  committed
  6cde32f
- fix in RowBasedKeyValueBatch
  kiszk
  committed
  ccc820f
Commits on Jul 5, 2017
- fix size of a byte array in UnsafeRow since 4-byte area is used only in a page
  kiszk
  committed
  3bd72c9
- round up size of key/value in UnsafeRow to a multiple of 8
  kiszk
  committed
  8a7a948
Commits on Jul 13, 2017
- add a test suite for storing to and recovering from a checkpoint
  kiszk
  committed
  7f5a269
Commits on Jul 19, 2017
- address review comments
  kiszk
  committed
  762f02a
Commits on Jul 25, 2017
- address review comments
  kiszk
  committed
  0159701
- fix test failure by removing an assert for debugging
  kiszk
  committed
  54be80e
Commits on Jul 26, 2017
- address review comments
  kiszk
  committed
  cc467de