Given statistics can be held on both:
A) When does the base GTT acquire derived, sample and full statistics on its columns.
Further, given user A and user B have an instance of the same GTT running in a query.
----------- session 1
INSERT INTO b_gtt SELECT a FROM t2;
COLLECT STATISTICS USING SAMPLE ON b_gtt COLUMN (a);
---------- session 2
INSERT INTO b_gtt SELECT a FROM t3;
B) will session 2's b_gtt use base table stats of t1, sample stats from t2 or derived stats from t3?