Add mem limit to lzo scanner.
Update use of ReadWriteUtil
Move row batch management out of ScannerContext and into HdfsScanner.
Updates from scan-node cleanup.
Updates from more ScanNode cleanup.
IMPALA-122: Fix FindFirstBlock logic.

Change-Id: I34e5ce2f6c112fdbcdd290faeff7d044ed77127d
Fix IMPALA-129, IMPALA-534, and other scanner bugs.

Change-Id: I7906f291fe6fd1bcfc96b8b03ed42ff31562b793
IMPALA-525: Sequence scanners use average block size to minimize reads past eosr

Change-Id: I33c198a5958ca8110f67682f7d51cfaf55b0bbd6
Updates for mem tracking.

Change-Id: I7a31b31383c18f5561e0c495ea87a43d3c52a782
Update Close() to return void.

Change-Id: Ia81259128dc24ab02e02a60b5ea3c5620ad4b60b
IMPALA-466: Updates to errno handling.

Change-Id: I475b75860cf01b0180134f9092cec4ab23082be3
Allow UDFs in conjunct expressions.

Change-Id: Ie205c8cd6b35117311f0aab58b9170109c07082f
IMPALA-729: fix resource management in Parquet scanner for multiple row groups

Change-Id: Ia794b13047a860fb53da44d021c0d4a4ced0ae90
Fix missing status check in lzo scanner.

Change-Id: I09ac28a0a97eac904b1c8d0a58f4c0127f09b3b0