[jira] [Created] (FLINK-13951) Unable to call limit without sort for batch mode

[Shang Yuanchun (Jira)]

Jeff Zhang created FLINK-13951:
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             Summary: Unable to call limit without sort for batch mode
                 Key: FLINK-13951
                 URL: https://issues.apache.org/jira/browse/FLINK-13951
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / API
    Affects Versions: 1.9.0
            Reporter: Jeff Zhang


Here's the sample code:  tenv.sql(select * from a).fetch(n)

 
{code:java}

Fail to run sql command: select * from a
org.apache.flink.table.api.ValidationException: A limit operation must be preceded by a sort operation.
  at org.apache.flink.table.operations.utils.factories.SortOperationFactory.validateAndGetChildSort(SortOperationFactory.java:117)
  at org.apache.flink.table.operations.utils.factories.SortOperationFactory.createLimitWithFetch(SortOperationFactory.java:102)
  at org.apache.flink.table.operations.utils.OperationTreeBuilder.limitWithFetch(OperationTreeBuilder.java:388)
  at org.apache.flink.table.api.internal.TableImpl.fetch(TableImpl.java:406) {code}



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