[TAJO-840] Improve query result print with counting empty table.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.9.0
• Component/s: Physical Operator, Worker
• Assignee: JaeHwa Jung
• Reporter: JaeHwa Jung
• Created: 22/May/14 02:59
• Updated: 11/Jun/14 20:03
• Resolved: 11/Jun/14 19:36

Description

If there is no data, tsql will print as follows:

default> select * from table1;
id,  name,  score,  type
-------------------------------
1,  name1-1,  1.1,  a
2,  name1-2,  2.3,  b
3,  name1-3,  3.4,  c
4,  name1-4,  4.5,  d
5,  name1-5,  5.6,  e

default> select count(*) from table1 where id = 10;
Progress: 100%, response time: 0.231 sec
?count
-------------------------------
(0 rows, 0.231 sec, 0 B selected)

But it need to print result detailedly as follows:

?count
-------------------------------
0
-------------------------------
(1 rows, 0.231 sec, 0 B selected)

Because if users implement some applications with TajoClient or TajoJDBC, they can't understand easy that a query finished successfully or a query finished unsuccessfully.