[C++] Support LZO compression

[asfimport]

I have some code that supports arrow compression with LZO and am willing to contribute. However, I do understand there is a license concern w.r.t using lzo library since it's under GPL2. I am not sure if you can take the change set.

Reporter: Haowei Yu / @sfc-gh-hyu

_{Note: This issue was originally created as ARROW-12430. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
Indeed, the license issue is a bit tricky. It is not clear whether making use of the LZO APIs absolutely requires adherence to the GPL by Arrow itself.

The GNU readline library (GPL-licensed) is in a similar situation and it states that you may make use of it inside software licensed under any GPL-compatible license (the Apache license 2.0 is GPL-compatible according to the FSF). However, the FSF contradicts its own advice in the GPL FAQ.

If you feel strongly about this feature, you should probably contact the LZO author and ask them their position, because that is what matters.

Note that, in any case, we would not distribute binaries with LZO enabled; you would have to compile Arrow yourself for that.

[asfimport]

Haowei Yu / @sfc-gh-hyu:
Ah ok, I really want arrow to support LZO since right now I have to keep the diff somewhere and patch those diff whenever I need to upgrade arrow version, which is painful. I don't need need binary distribution, I can compile arrow by myself, that is fine.

[asfimport]

Antoine Pitrou / @pitrou:
Is it for Parquet? Otherwise I'm not sure what you'd need it for.

[asfimport]

Haowei Yu / @sfc-gh-hyu:
Yes, it's for parquet.