Add stream related operators and strategies
Add Streaming dependency for sql module
Abstract strategies to build a strategy factory
Add StreamSQLContext as a entry point for StreamSQL
Add support for table and stream join
Modify due to some merge conflicts
Add StreamSQL README
[StreamSQL] Add missing strategies in HiveContext
[StreamSQL] Modify according to rebase Apache/Spark code
[StreamSQL] Framework for streamsql ddl plan
add parts of the postparser implementation
Implementation of DDLPostParser
Implementation of StreamSQLMetastoreCatalog
[StreamSQL] Modify HiveParser to support stream ddl to spark
fix compling errors
[StreamSQL] Fix run-time exception in catalog casting
[StreamSQL] Use streamSQLMetastoreCatalog explicitly
[StreamSQL] Add parts of the postparser implementation
[StreamSQL] Refactor the stream related DDL work
[StreamSQL] Extract StreamSQL related code to streamsql subproject