BeamQueryPlanner is the main interface.See: Description
| Class | Description | 
|---|---|
| BeamRelDataTypeSystem | 
 customized data type in Beam. 
 | 
| BeamRuleSets | 
RuleSet used in BeamQueryPlanner. | 
BeamQueryPlanner is the main interface. It defines data sources, validate a SQL
 statement, and convert it as a Beam pipeline.