Filter based on 2 coupled columns

[felio]

Hello everyone,

I am trying build a filter that enables users to filter with a selector based on 1 column but results depending on 2 columns.

In mathematical terms: Assuming there is a table with two columns A, B and rows 1 to n. Now, if the end users chooses to filter based on column A and selected value x I want all rows to remain where either:
1. rows i where a_i = x
2. rows i where there is a row j such that (b_i = b_j  and a_j =  x)

With an example:

A	B
13	circle
13	square
19	circle
19	heptagon

Now, after 'weakly' filtering based on A and 13 the desired result would be:

A	B
13	circle
13	square
19	circle

Is there any way to do this in Qlik Sense? 

Many Thanks

[marcus_sommer]

You could include such condition in an expression within a set analysis like:

sum({< B = p(B), A = >} Value)

[Aasir]

Using set analysis & applying filters

{<A = {"$(=GetFieldSelections(A))"} >} // Filter based on selected value in column A
+
{<B = {"$(=Concat(DISTINCT B, ', '))"} >} // Filter based on associated values in column B

[felio]

Thanks to both of you for your replies. I ended up with a solution based on both of your proposals.
By adding a 3rd column with the measure

Concat(distinct {< B = p(B), A = >}B)

I got the desired result.