Fix type casting of generalized integer columns.

[cristianberneanu]

Closes #332.

[pdobacz]

LGTM, I remember this has been a pain point. Did you double check exporting works as expected with/without generalization? I think it should be fine, but not 100% sure.

[cristianberneanu]

LGTM, I remember this has been a pain point. Did you double check exporting works as expected with/without generalization? I think it should be fine, but not 100% sure.

Good point and you're right, it doesn't work because the cast to integer acts as a round, so the expression is rejected.

[cristianberneanu]

Actually, that is not right, as it is a cast from text. Not sure what is happening, have to look deeper into it.

[pdobacz]

Actually, that is not right, as it is a cast from text. Not sure what is happening, have to look deeper into it.

What I recall is that the CSVDataProvider produces text for all columns, and then correct typing is up to a correct cast (based on the type inferred by the .js code) in the preview/export query.