[GitHub] [drill] paul-rogers opened a new pull request #1897: DRILL-7442: Create multi-batch row set reader

[GitBox <gi...@apache.org>]

paul-rogers opened a new pull request #1897: DRILL-7442: Create multi-batch row set reader
URL: https://github.com/apache/drill/pull/1897
 
 
   Adds a ResultSetReader that works across multiple batches
   in a result set. Reuses the same row set and readers if
   schema is unchanged, creates a new set if the schema changes.
   
   Adds a unit test for the result set reader.
   
   Adds a "rebind" capability to the row set readers to focus
   on new buffers under an existing set of vectors. Used when
   a new batch arrives, if the schema is unchanged.
   
   Extends row set classses to be aware of the BatchAccessor class
   which encapsulates a container and optional selection vector,
   and tracks schema changes.
   
   Moves row set tests into the same package as the row sets.
   (Row set classes were moved a while back, but the tests were
   not moved.)
   
   Renames some BatchAccessor methods.

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