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https://issues.apache.org/jira/browse/FLINK-4554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15726118#comment-15726118
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ASF GitHub Bot commented on FLINK-4554:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/2919#discussion_r91108867
--- Diff: docs/dev/table_api.md ---
@@ -2027,6 +2034,50 @@ COMPOSITE.get(INT)
</td>
</tr>
+ <tr>
+ <td>
+ {% highlight java %}
+ARRAY.at(INT)
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Returns the element at a particular location in an array. The
index starts at 1.</p>
+ </td>
+ </tr>
+
+ <tr>
+ <td>
+ {% highlight java %}
+array(ANY [, ANY ]*)
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Creates an array from a list of values. The array will be an
array of objects (not primitives).</p>
+ </td>
+ </tr>
+
+ <tr>
+ <td>
+ {% highlight java %}
+ARRAY.cardinality()
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Returns the number of elements of an array.</p>
+ </td>
+ </tr>
+
+ <tr>
+ <td>
+ {% highlight scala %}
+ARRAY.element()
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Returns the sole element of an array. Returns <code>null</code>
if the collection is empty. Throws an exception if the array has more than one
element.</p>
--- End diff --
I think "sole element" in this context is not very clear. I'd rephrase it
to something like: "Returns the sole element of an array with a single element."
`collection` -> `array`?
> Add support for array types
> ---------------------------
>
> Key: FLINK-4554
> URL: https://issues.apache.org/jira/browse/FLINK-4554
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Timo Walther
>
> Support creating arrays:
> {code}ARRAY[1, 2, 3]{code}
> Access array values:
> {code}myArray[3]{code}
> And operations like:
> {{UNNEST, UNNEST WITH ORDINALITY, CARDINALITY}}
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