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https://issues.apache.org/jira/browse/FLINK-9688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16530080#comment-16530080
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ASF GitHub Bot commented on FLINK-9688:
---------------------------------------
Github user hequn8128 commented on a diff in the pull request:
https://github.com/apache/flink/pull/6223#discussion_r199537034
--- Diff: docs/dev/table/sql.md ---
@@ -1510,6 +1510,17 @@ ATAN(numeric)
</td>
</tr>
+ <tr>
+ <td>
+ {% highlight text %}
+ATAN2(numeric, numeric)
+{% endhighlight %}
+ </td>
+ <td>
+ <p>Calculates the arc tangent of a given coordinate.</p>
--- End diff --
I checked the [wiki](https://en.wikipedia.org/wiki/Atan2) about atan2, it
said: The atan2 function calculates one unique arc tangent value from two
variables y and x. So, would it be better `of two variables`? atan2(y,x) can
be the arc tangent of (x,y) or (nx, ny).
> ATAN2 Sql Function support
> --------------------------
>
> Key: FLINK-9688
> URL: https://issues.apache.org/jira/browse/FLINK-9688
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Sergey Nuyanzin
> Assignee: Sergey Nuyanzin
> Priority: Minor
> Labels: pull-request-available
>
> simple query fails {code}
> ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
> BatchTableEnvironment tableEnv = TableEnvironment.getTableEnvironment(env,
> config());
> DataSet<Tuple3<Integer, Long, String>> ds =
> CollectionDataSets.get3TupleDataSet(env);
> tableEnv.registerDataSet("t1", ds, "x, y, z");
> String sqlQuery = "SELECT atan2(1,2)";
> Table result = tableEnv.sqlQuery(sqlQuery);
> {code}
> while at the same time Calcite supports it and in Calcite's sqlline it works
> like {noformat}
> 0: jdbc:calcite:model=target/test-classes/mod> select atan2(1,2);
> +-----------------+
> | EXPR$0 |
> +-----------------+
> | 0.4636476090008061 |
> +-----------------+
> 1 row selected (0.173 seconds)
> {noformat}
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