We are working on various usability improvements for v2. This shows how you can select a single column by typing part of the name:
This could save a lot of time if your dataset has hundreds or thousands of columns.
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It could even help for a couple of dozen 
Progressive filtering is a very useful feature.
Would this be possible, too, in areas where $(variable…) is entered? So that it comes up after “$(v” is entered.
Yes, but I’m not sure if we are going to have chance to do this for v2.0.
V2.0.1 would be sufficient, too 
It is clear things need it’s time, but it will help in the long term …
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Column name filtering will also be available for Filter, If, Sort, Substitute and Javascript transforms in beta 2.
@Admin when is beta v2 going to be available?
The second beta release will hopefully be available this week. But, as ever, no promises.
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Column name filtering for Filter, If, Sort, Substitute and Javascript now available to test at: