I can't answer the first question authoritatively, though off the top of my head, could you translate that to `0 - x` and use the binary operator? You may also consider posting this question to the [email protected] mailing list.
As for contributing tutorials and user guides, yes, please do. I believe the right location to add what you're talking about would be in https://github.com/apache/arrow/tree/master/docs/source/python. Neal On Fri, Jul 24, 2020 at 12:42 PM Troy Zimmerman <[email protected]> wrote: > Hi, > > I’ve written a small library that uses the ast module to parse a Python > expression into a Gandiva expression tree. I’d like to able to do numeric > negation (i.e. -x) in an expression, but I’ve I looked through the source > code and haven’t found a way to achieve this. (I could also be missing an > obvious workaround.) > > Separately, are there any tutorials on using the Python bindings for > Gandiva? If not, would the project be open to such a contribution? At the > moment I’ve got scattershot notes of what I’ve learned from digging through > the source, but could organize them into a brief tutorial or cookbook. > > Best, > Troy
