bigquery udf: len is undefined

[tsdlovell]

workaround is to use javascript notation in the udf

len = lambda x: x.length

which will transpile to

let len = ((x) => x.length)

[tsdlovell]

same is true of zip and probably a lot of other builtins, so maybe this phrasing should change or be caveated

Most of the Python language is supported including classes, functions and generators

[cpcloud]

Most of the language is supported, builtin functions are not part of the language, they are part of the standard library. I'll make that distinction more clear there.

[cpcloud]

Pull requests always welcome to add builtins

[cpcloud]

@tsdlovell Are there any particular builtins you'd like to see other len? Happy to implement any high priority ones alongside len.

[tsdlovell]

For enumerate

enumerate = lambda x: x.map(lambda e, i: (e, i))

transpiles to

let enumerate = ((x) => x.map(((e, i) => [e, i])));

[cpcloud]

enumerate yields index, element you probably want to write that as lambda x: x.map(lambda e, i: (i, e))

[cpcloud]

If you are feeling adventurous you can add the rewrites yourself without having to wait on me to implement them. See here for some examples: https://github.com/ibis-project/ibis/blob/master/ibis/bigquery/udf/core.py#L83-L117

[tsdlovell]

@cpcloud , can you point me to any snippets where a more complicated statement is substituted?

[tsdlovell]

I might be able to start from visit_ListComp