From another post i got the details how infiniDB allocates disk space for dictionary and non-dictionary column
"Non-dictionary columns are set to the 8 million row size when they exceed 256K rows. Dictionary columns will grow as needed, 64 MB at a time."
So for Non-dictionary columns if number of records are less than 8 million, it will allocate disk size for 8 million rows. What will happed if actual number of size exceeds 8 million rows?