Github user anoopsharma00 commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/1009#discussion_r106193976
--- Diff: core/sql/regress/seabase/EXPECTED031 ---
@@ -888,6 +960,143 @@ CREATE INDEX T031T1I1 ON TRAFODION.SCH.T031T1
--- SQL operation complete.
>>
+>>-- purgedata of table with delimited name
+>>drop table if exists "tT";
+
+--- SQL operation complete.
+>>create table "tT" (a int);
+
+--- SQL operation complete.
+>>purgedata "tT";
+
+--- SQL operation complete.
+>>
+>>-- group by rollup would sometimes crash compiler.
+>>drop table if exists mytable;
+
+--- SQL operation complete.
+>>create table mytable(a char(10), b char(10), c int, d int);
+
+--- SQL operation complete.
+>>insert into mytable values
++>('A1', 'B1', 1, 1),
++>('A1', 'B1', 1, 2),
++>('A1', 'B1', 2, 3),
++>('A1', 'B1', 2, 4),
++>('A1', 'B2', 3, 5),
++>('A1', 'B2', 3, 6),
++>('A1', 'B2', 4, 7),
++>('A1', 'B2', 4, 8),
++>('A2', 'B3', 5, 9),
++>('A2', 'B3', 5, 10),
++>('A2', 'B3', 6, 11),
++>('A2', 'B3', 6, 12),
++>('A2', 'B4', 7, 13),
++>('A2', 'B4', 7, 14),
++>('A2', 'B4', 8, 15),
++>('A2', 'B4', 8, 16);
+
+--- 16 row(s) inserted.
+>>select a, b, c, sum(d) as newcol from mytable where a in ('A1')
++> group by(a, b, c);
+
+A B C NEWCOL
+---------- ---------- ----------- --------------------
+
+A1 B1 1 3
+A1 B2 3 11
+A1 B2 4 15
+A1 B1 2 7
+
+--- 4 row(s) selected.
+>>select a, b, c, sum(d) as newcol from mytable where d > 5
++> group by rollup(a, b, c);
+
+A B C NEWCOL
+---------- ---------- ----------- --------------------
+
+A1 B2 3 6
+A1 B2 4 15
+A1 B2 ? 21
+A1 ? ? 21
+A2 B3 5 19
+A2 B3 6 23
+A2 B3 ? 42
+A2 B4 7 27
+A2 B4 8 31
+A2 B4 ? 58
+A2 ? ? 100
+? ? ? 121
+
+--- 12 row(s) selected.
+>>select a, b, c, sum(d) as newcol from mytable where a in ('A1')
++> group by rollup(a, b, c);
+
+A B C NEWCOL
+---------- ---------- ----------- --------------------
+
+A1 B1 1 3
+A1 B1 2 7
+A1 B1 ? 10
+A1 B2 3 11
+A1 B2 4 15
+A1 B2 ? 26
+A1 B3 5 19
+A1 B3 6 23
+A1 B3 ? 42
+A1 B4 7 27
+A1 B4 8 31
+A1 B4 ? 58
+A1 ? ? 136
+A1 ? ? 136
--- End diff --
You are right, this is an existing bug.
For a statement of the form:
select a, sum(a) from t where a = 1 group by rollup (a)
the VEG transformation replaces the 'a' in select list with '1' and
that causes that column to not return a null('?') as part of the
final rollup group. We probably need to have VEG transformation
use the column 'a' instead of '1'.
Will file a separate jira for this case.
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