Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2319#discussion_r83492774
  
    --- Diff: docs/dev/table_api.md ---
    @@ -1656,6 +1656,29 @@ temporalOverlaps(TIMEPOINT, TEMPORAL, TIMEPOINT, 
TEMPORAL)
           </td>
         </tr>
     
    +    <tr>
    +      <td>
    +        {% highlight java %}
    +ANY.flatten()
    +{% endhighlight %}
    +      </td>
    +      <td>
    +        <p>Converts a Flink composite type (such as Tuple, POJO, etc.) and 
all of its subtypes into a flat representation where every subtype is a 
separate field.</p>
    +      </td>
    +    </tr>
    +
    +    <tr>
    +      <td>
    +        {% highlight java %}
    +COMPOSITE.get(STRING)
    --- End diff --
    
    Didn't we agree on the symbol parsing approach like `'field$subfield`? 
    Would that be more difficult to implement or have any other shortcomings?


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