godfreyhe commented on issue #11794:
URL: https://github.com/apache/flink/pull/11794#issuecomment-618133036


   hi @kl0u `CollectionEnvironment` is used in flink-table-planner for testing, 
e.g. 
`org.apache.flink.table.runtime.batch.sql.TableEnvironmentITCase#testInsertIntoMemoryTable`
   and 
`org.apache.flink.table.runtime.batch.table.TableSinkITCase#testOutputFormatTableSink`.
 
   User could also use a collection as source for demo.
   After we use executor to submit a job, an executor for 
`CollectionEnvironment` is also needed.


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