Hello,
I have a strange situation: a simple "count(num_code_1)" expression on a numeric datawindow column works in a computed field but returns an empty string when used in the describe evaluate function. With string columns everything works as expected. As a workaround I had to add zero to numeric columns to make it work in an evaluate call:
describe( "evaluate( 'count( num_code_1+0)', 1)").
PB 2017 build 1681.
Best regards,
Konstantin