Add implementations for getSchemas in DatabaseMetaData interface.
Order DatabaseMetaData result sets according to spec
Use LIKE in DatabaseMetaData for pattern arguments
Add Node and NodeManager to SPI
Do not distribute create table plan when in single node mode
TPCH plugin
Convert benchmarks to use CREATE TABLE for data loading
Update to airlift tpch 0.1
Improve encapsulation of native connector interfaces

- Inject NativeMetadata into NativeConnectorFactory, just like DataStreamProvider et al.
- Make NativeSplitManager depend on the connector-specific NativeMetadata instead of global Metadata
Fix state inconsistency in StateInfo

Read stage state first when creating StageInfo
Change StateMachine to be based on equality not identity
Change StateMachine to not allow nulls
Deep copy TaskInfo outputs in constructor to avoid ConcurrentModificationException
Replace generic "getService" method in Connector with explicit methods
Synchronize before copying the output items
When driver creation fails properly fire failed event
Add support for tables with sampled data
Optimizations for sampled data

* Run aggregates directly on sampled data
* Pull materialization up through JOINs and UNIONs
Add more optimizations for sampled tables

Pull materialization up through:
* filter
* project
* top N
* sort
* limit
* semi join
* mark distinct
Move table creation into DistributedLogicalPlanner