If you need to use slicepicker instead of slicetree and you want to introduce hierarchical choices, you have the possibility of using {sliceHierarchy: } with the options : "none" | "filter" | "ask" | "clear"

The hierarchy style code impacts the next slicer
none : for full unconstrained choices
filter : removes non existant choices based on the current constraint in the slicer
ask : automatically fills the slicer to the only possible choice (if there's only one choice), otherwise clears the slicer
clear : always clear the slicer if there are no existing choices

Hover on the stylecode in the IDE for the full explanation

The order is :
0-9A-Za-z

which means to test if a string is fully numerical, you can also test if it's < "A"

Thanks a lot for your contribution arkadir !
There's a slight mistake, the date format specifying should appear before the alias of the table. So the line should be this instead.

read "/example.csv" date: "yyyy-MM-dd*" as T with

Related parsing functions:
containscount()
contains() : single needle
containsany() : multiple needles
fieldcount()

Related parsing functions:
containscount()
contains() : single needle
containsany() : multiple needles
fieldcount()

containscount()
contains() : single needle
containsany() : multiple needles
fieldcount()