testfixer0 created FLINK-15975:
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             Summary: Use LinkedHashMap for deterministic iterations
                 Key: FLINK-15975
                 URL: https://issues.apache.org/jira/browse/FLINK-15975
             Project: Flink
          Issue Type: Improvement
          Components: Connectors / Hive
            Reporter: testfixer0


The test `testMap` in `HiveGenericUDFTest` invokes two methods 
`HiveGenericUDFTest.init` and `HiveScalarFunction.eval`.  These two methods 
depend on `getConversion` and `toFlinkObject` in class `HiveInspectors`. When 
the `inspector` is the instance of `MapObjectInspector`, it can return a 
`HashMap`. However, `HashMap` does not guarantee any specific order of entries. 
Thus, the test can fail due to a different iteration order.

In this PR, we propose to use a `LinkedHashMap` instead to guarantee the 
iteration order.



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