WIP: NXCALS-1140 Make spark case sensitive to column names.

As the name says, by dafault spark (since 2.0.0 if I'm not mistaken) is not case sensitive to column names, this means that if you search for data where there are 2 columns which the name differs only in case, spark actually throws an exception saying the name is ambiguous.

The question here is: Do we want to provide case sensitiveness to our clients queries? I think we do as we do not control the name of the properties and fields they want to log...

Edited by Jakub Wozniak

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