Review Request 33180: DRILL-2181 Throw proper error message when flatten is used within an 'order by' or 'group by'

[Sean Hsuan-Yi Chu]

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Review request for drill and Jason Altekruse.


Bugs: DRILL-2181
    https://issues.apache.org/jira/browse/DRILL-2181


Repository: drill-git


Description
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Flatten function in order by, group by, distinct, aggregate functions is 
disabled


Diffs
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exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/parser/UnsupportedOperatorsVisitor.java
 4830fe1 
  exec/java-exec/src/test/java/org/apache/drill/TestDisabledFunctionality.java 
f62f060 

Diff: https://reviews.apache.org/r/33180/diff/


Testing
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tpch, functional (except for the cases which are meant to be removed)


Thanks,

Sean Hsuan-Yi Chu