Use of Interval Argument Being Allowed for Expand Operator

[JSRankins]

The following is not receiving an error:

expand Interval[@2012-02-01, @2012-02-28] per day

However, CQL signature for Expand requires a list of intervals.

[brynrhodes]

@JSRankins , my guess is that the translator running in this environment is allowing for list promotion, and it's automatically promoting the list to an interval. We should consider exposing the translator configuration options in the UI so users can control that behavior.

[JSRankins]

@brynrhodes I like the idea of giving users control. However, it seems odd to me that CQL would encourage casting a single Interval to a list for the expand operator. For example:

expand { Interval[@2018-01-01, @2018-01-04] } per day

expand { Interval[@2018-01-01, @2018-01-04] } per 2 days

Maybe the operator could be overloaded in CQL and allow for expanding intervals outside of lists.

expand(argument Interval, per Quantity) List<Interval>

Thoughts?

[brynrhodes]

@JSRankins , that's a great point, and now that you mention it, I've already used it that way myself. Do you want to submit an STU comment to add that overload?

[JSRankins]

@brynrhodes Sure.

[JSRankins]

@brynrhodes Created http://hl7.org/dstucomments/showdetail_comment.cfm?commentid=1896