Fix memory (estimate) leak in TopNOperator
instanceof Slice is always false. removed superfluous code snippet
removed unnecessary unboxing
Added documentation for color functions.
Adding missing functions to documentation
Adding logical and comparison operators to the documentation
Use catalog and use schema
Implement distinct limit operator
Ignore hidden files/directories in AsyncRecursiveWalker
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