Add "json" support

[iosifnicolae2]

Fixes #87

[Denchick]

I'm just been walking around
It would be cool if you add tests also

[iosifnicolae2]

Unfortunately I'm not that used on writing c++ code, so I don't know exactly how add the appropriate tests..

[Denchick]

Well, you don't need to know how to write tests in C++ :)
There is a folder tests in the root of the repository, inside there are also two folders: sql and expected.
How to run tests you can see in Makefile

[manakao]

hello guys, i have same issue. when this PR will be merged?

[Denchick]

@ildus, hi! Could you approve to run tests here?

[ildus]

@iosifnicolae2 could you add sql tests for it (look for the comment from @Denchick)? That will show that the patch is working. Also please remove .idea files.

[iosifnicolae2]

@ildus sorry, but currently I don't have time to invest into creating a proper PR request, if anyone is interesting into doing this, it would be great.

Thank you!