iterator
Classes 
CondExpr
DuplElim
FileScan
FldSpec
IoBuf
Iterator
NestedLoopsJoins
OBuf
Operand
pnode
pnodePQ
pnodeSplayNode
pnodeSplayPQ
PredEval
Projection
RelSpec
Sort
SortMerge
SpoofIbuf
TupleUtils
Exceptions 
DuplElimException
FileScanException
InvalidRelation
IteratorBMException
JoinLowMemory
JoinNewFailed
JoinsException
LowMemException
NestedLoopException
NoOutputBuffer
PredEvalException
SortException
TupleUtilsException
UnknowAttrType
UnknownKeyTypeException
WrongPermat