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I have been looking into how to write a UDF in BigQuery and found this syntax:

CREATE  { TEMPORARY | TEMP }  FUNCTION
function_name ([named_parameter[, ...]])
[RETURNS data_type]
{ [LANGUAGE language AS """body"""] | [AS (function_definition)] };

In the document I found, there is no clear mention of what languages are supported. In the examples given in the page, it only talks about "js" 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.

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6

From that same page:

Supported external UDF languages

External UDFs support code written in JavaScript, which you specify using js as the LANGUAGE.

You can't use languages other than JavaScript.

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2 Comments

Only JS. But also SQL!
..and C/Rust ;-) medium.com/@hoffa/…

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