Added by Cube (PLAN §11.5, Q1): every row, null or not, so it takes no column
Added in PLAN §11.28: the texts joined by separator, in no set order
Added in PLAN §11.28: the middle value, or the average of the two middle ones
Added in PLAN §11.28: the value percentile of the way through the sorted values, interpolated as Median is
Added in PLAN §11.28: the sample standard deviation, over n - 1 values
Added in PLAN §11.28: the sample variance, over n - 1 values
An aggregation function, as saved: a Group's, and a window's but its rank functions