setof

setof
Returns a new list containing only those elements in a list or the keys in an association table that satisfy an expression. This is a syntax form.

setof(
        s_formalVar
        l_valueList
        g_predicateExpression
)
=> l_result 

setof(
        s_formalVar
        o_table
        g_predicateExpression
)
=> l_result