title: BigQuery UDF in Python or only in JavaScript
body: <p>I have been looking into how to write a UDF in BigQuery and found this syntax:</p>
  <pre><code>CREATE  { TEMPORARY | TEMP }  FUNCTION
  function_name ([named_parameter[, ...]])
  [RETURNS data_type]
  { [LANGUAGE language AS &quot;&quot;&quot;body&quot;&quot;&quot;] | [AS (function_definition)] };
  </code></pre>
  <p>In <a href="https://cloud.google.com/bigquery/docs/reference/standard-sql/user-defined-functions" rel="nofollow noreferrer">the document</a> I found, there is no clear mention of what languages are supported. In the examples given in the page, it only talks about &quot;js&quot; and I can't find any other language examples so I presume it only supports JavaScript but I am wondering whether anyone knows for sure.</p>