Why is unique index not improving performance in this case? Furthermore,
applying group attribute on cust column in table a surprising makes this
10x slower. Why? n:1300000a:(cust:n?`8; v1:n?100; v2:n?100; v3:n?100)/
with unique indexb1:`u#exec dis...
I am trying to flatten some columns of a table into a single column. My
current approach is to enlist those columns into a single column and
then use ungroup on table to flatten it. But this approach is very
inefficient, takes more than 2 seconds on ...