When I subset a dataset in a DATA step, SAS will continue to run for much longer than expected, so long in fact that I have not seen it finish running. However, when I break the run and cancel the submitted statements, the log indicates that 1,271 observations were read, which is number of observations that I expect to have in the subset. Why is it that SAS keeps running when all of the observations that match the WHERE condition have been read? In the DATA step I use a WHERE statement to subset for observations where the character variable SUB = '123'. The dataset is large (1.3M+ obs.), but as I mentioned, the resulting data set "filtered_items" should only have 1,271 observations. libname corpxin "\\filepath\folder";
data filtered_items;
set corpxin.items_202001;
where SUB = '123';
run;
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