Kyle Weaver created BEAM-12691:
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             Summary: Annotate field access in SQL DoFns.
                 Key: BEAM-12691
                 URL: https://issues.apache.org/jira/browse/BEAM-12691
             Project: Beam
          Issue Type: Improvement
          Components: dsl-sql
            Reporter: Kyle Weaver


Use the @FieldAccess annotation in SQL DoFns. BeamCalcRel and 
BeamZetaSqlCalcRel are the DoFns that SQL uses to do projects, so these are 
likely the ones we'll need. @FieldAccess will unlock optimizations such as 
BEAM-4457 once they are available.

cc: [~apilloud]



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