Misc

1. DataType
2. Value
3. Vector[DataType]
   1. FlatVector
   2. DictionaryVector
   3. ConstantVector
   4. SequenceVector
   5. SelectorVector ......
4. DataChunk
5. Operator
   1. Filter
   2. Projection
   3. Join
   4. Hash Group - Aggregate
   5. Window
6. Pipeline