Commits on May 19, 2020

1. CDAP-16708 add API for autojoiner …

   Add a new set of classes for AutoJoiner, which can be used instead
   of the current Joiner interface. This new API leaves all of the
   implementation details up to the application, which will allow the
   app to perform the join in better ways. For example, in the Spark
   program, it will allow using broadcast joins.
   
   Plugin developers are responsible for returning a JoinDefinition
   based on information about incoming stages.
   
   This change includes the JoinDefinition as well as all the classes
   required to create a definition. It also includes validation logic
   to make sure the plugin cannot create a definition that tries to
   join on a field that doesn't exist, or tries to join on fields
   that have mismatched types, or any other type of error.

   

   albertshau committed May 19, 2020
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