[jira] [Created] (BEAM-2749) update BeamSqlExample

[Xu Mingmin (JIRA)]

Xu Mingmin created BEAM-2749:
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             Summary: update BeamSqlExample
                 Key: BEAM-2749
                 URL: https://issues.apache.org/jira/browse/BEAM-2749
             Project: Beam
          Issue Type: Sub-task
          Components: dsl-sql
            Reporter: Xu Mingmin


change usage to reflect the latest status, and add an example with GROUP_BY



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