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From: Troy Zimmerman <tazimmerman@me.com>
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Subject: Re: Does gandiva support the unary minus operator?
Date: Fri, 24 Jul 2020 20:47:46 -0500
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Hi Neal,

Thank for you the quick response & suggestion. That is the obvious workaroun=
d I missed. :)

As for the contributing docs, I=E2=80=99ll put something together and submit=
 a PR.

Thank you again!

Best,
Troy

> On Jul 24, 2020, at 15:23, Neal Richardson <neal.p.richardson@gmail.com> w=
rote:
>=20
> =EF=BB=BF
> I can't answer the first question authoritatively, though off the top of m=
y head, could you translate that to `0 - x` and use the binary operator? You=
 may also consider posting this question to the dev@arrow.apache.org mailing=
 list.
>=20
> As for contributing tutorials and user guides, yes, please do. I believe t=
he right location to add what you're talking about would be in https://githu=
b.com/apache/arrow/tree/master/docs/source/python.
>=20
> Neal
>=20
>> On Fri, Jul 24, 2020 at 12:42 PM Troy Zimmerman <tazimmerman@me.com> wrot=
e:
>> Hi,
>>=20
>> I=E2=80=99ve written a small library that uses the ast module to parse a P=
ython expression into a Gandiva expression tree. I=E2=80=99d like to able to=
 do numeric negation (i.e. -x) in an expression, but I=E2=80=99ve I looked t=
hrough the source code and haven=E2=80=99t found a way to achieve this. (I c=
ould also be missing an obvious workaround.)
>>=20
>> Separately, are there any tutorials on using the Python bindings for Gand=
iva? If not, would the project be open to such a contribution? At the moment=
 I=E2=80=99ve got scattershot notes of what I=E2=80=99ve learned from diggin=
g through the source, but could organize them into a brief tutorial or cookb=
ook.
>>=20
>> Best,
>> Troy

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr">Hi Neal,</div><div dir=3D"=
ltr"><br></div><div dir=3D"ltr">Thank for you the quick response &amp; sugge=
stion. That is the obvious workaround I missed. :)</div><div dir=3D"ltr"><br=
></div><div dir=3D"ltr">As for the contributing docs, I=E2=80=99ll put somet=
hing together and submit a PR.</div><div dir=3D"ltr"><br></div><div dir=3D"l=
tr">Thank you again!</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Best,<=
/div><div dir=3D"ltr">Troy</div><div dir=3D"ltr"><br><blockquote type=3D"cit=
e">On Jul 24, 2020, at 15:23, Neal Richardson &lt;neal.p.richardson@gmail.co=
m&gt; wrote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D=
"ltr">=EF=BB=BF<div dir=3D"ltr"><div>I can't answer the first question autho=
ritatively, 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 t=
o the <a href=3D"mailto:dev@arrow.apache.org">dev@arrow.apache.org</a> maili=
ng list.</div><div><br></div><div>As for contributing tutorials and user gui=
des, yes, please do. I believe the right location to add what you're talking=
 about would be in <a href=3D"https://github.com/apache/arrow/tree/master/do=
cs/source/python">https://github.com/apache/arrow/tree/master/docs/source/py=
thon</a>.</div><div><br></div><div>Neal<br></div></div><br><div class=3D"gma=
il_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Jul 24, 2020 at 12:4=
2 PM Troy Zimmerman &lt;<a href=3D"mailto:tazimmerman@me.com">tazimmerman@me=
.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"marg=
in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
">Hi,<br>
<br>
I=E2=80=99ve written a small library that uses the ast module to parse a Pyt=
hon expression into a Gandiva expression tree. I=E2=80=99d like to able to d=
o numeric negation (i.e. -x) in an expression, but I=E2=80=99ve I looked thr=
ough the source code and haven=E2=80=99t found a way to achieve this. (I cou=
ld also be missing an obvious workaround.)<br>
<br>
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=E2=
=80=99ve got scattershot notes of what I=E2=80=99ve learned from digging thr=
ough the source, but could organize them into a brief tutorial or cookbook.<=
br>
<br>
Best,<br>
Troy</blockquote></div>
</div></blockquote></body></html>=

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