DRILL-317: StorageEngineRegistry creates a new StorageEngine everytime getEngine() is called
DRILL-311: Replace OrderedPartitionBatchCreator with OrderedPartitionSenderCreator
DRILL-312: Modularize org.apache.drill.exec.physical.impl.ImplCreator using operator creator registry
DRILL-313: Fix for Limit operator only transferring buffers on new schema
DRILL-274: Spooling batch buffer
DRILL-303: RecordBatchLoader.load always creates new schema
DRILL-301: Join two tables hit IndexOutOfBoundsException
DRILL-297: Trace operator throws NPE if the configured path is not writable
DRILL-293: Sort operator throws NPE on empty record batch
DRILL-281 Add broadcast sender
Retain buffers in send