Hi all,
My environment includes: phoenix version 4.5.0, HBase version 0.98,
Cloudera 5.2
When I group by a divided value (e.g., time/10) the divided value will
return as NULL.
Please see the simple examples below,
Thanks in advance,
--Rafit
create table test(time integer not null, hostname varchar not null,usage
float constraint pk PRIMARY KEY(time, hostname));
upsert into test values(1439853441,'qa8',3.28);
upsert into test values(1439853449,'qa8',3.28);
upsert into test values(1439853459,'qa8',3.28);
upsert into test values(1439853458,'qa8',3.27);
upsert into test values(1439853457,'qa8',6.27);
upsert into test values(1439853462,'qa8',8.27);
upsert into test values(1439853462,'qa9',8.27);
upsert into test values(1439853457,'qa9',6.27);
0: jdbc:phoenix:localhost> select * from test;
+------------------------------------------+------------------------------------------+----------------------------------------+
| TIME | HOSTNAME
| USAGE |
+------------------------------------------+------------------------------------------+----------------------------------------+
| 1439853441 | qa8
| 3.28 |
| 1439853449 | qa8
| 3.28 |
| 1439853457 | qa8
| 6.27 |
| 1439853457 | qa9
| 6.27 |
| 1439853458 | qa8
| 3.27 |
| 1439853459 | qa8
| 3.28 |
| 1439853462 | qa8
| 8.27 |
| 1439853462 | qa9
| 8.27 |
+------------------------------------------+------------------------------------------+----------------------------------------+
0: jdbc:phoenix:localhost> select time/10, hostname, usage from test;
+----------------------------------------+------------------------------------------+------------------------------------------+
| (TIME / 10) | HOSTNAME |
USAGE |
+----------------------------------------+------------------------------------------+------------------------------------------+
| 143985344 | qa8
| 3.28 |
| 143985344 | qa8
| 3.28 |
| 143985345 | qa8
| 6.27 |
| 143985345 | qa9
| 6.27 |
| 143985345 | qa8
| 3.27 |
| 143985345 | qa8
| 3.28 |
| 143985346 | qa8
| 8.27 |
| 143985346 | qa9
| 8.27 |
+----------------------------------------+------------------------------------------+------------------------------------------+
0: jdbc:phoenix:localhost> select time/10 as tm, hostname, avg(usage) from
test group by hostname, tm;
+----------------------------------------+------------------------------------------+------------------------------------------+
| TM | HOSTNAME |
AVG(USAGE) |
+----------------------------------------+------------------------------------------+------------------------------------------+
| null |
| 3.2799 |
| null |
| 4.2733 |
| null |
| 6.2699 |
| null |
| 8.27 |
| null |
| 8.27 |
+----------------------------------------+------------------------------------------+------------------------------------------+
*hostname is empty, time/10 is null*
*I thought it might be related to the fact that the time is a primary key
so I ran the next test case:*
0: jdbc:phoenix:localhost> create table test1(time integer not null,
hostname varchar not null,usage float,period integer constraint pk PRIMARY
KEY(time, hostname));
0: jdbc:phoenix:localhost> upsert into test1
values(1439853462,'qa9',8.27,1439853462);
0: jdbc:phoenix:localhost> upsert into test1
values(1439853461,'qa9',8.27,1439853362);
0: jdbc:phoenix:localhost> upsert into test1
values(1439853461,'qa9',5.27,1439853461);
0: jdbc:phoenix:localhost> upsert into test1
values(1439853451,'qa9',4.27,1439853451);
0: jdbc:phoenix:localhost> select * from test1;
+-------------------------------------+-------------------------------------+--------------------------------------+---------------------------------------+
| TIME | HOSTNAME |
USAGE | PERIOD |
+-------------------------------------+-------------------------------------+--------------------------------------+---------------------------------------+
| 1439853451 | qa9 | 4.27
| 1439853451 |
| 1439853461 | qa9 | 5.27
| 1439853461 |
| 1439853462 | qa9 | 8.27
| 1439853462 |
+-------------------------------------+------------------------------------+--------------------------------------+----------------------------------------+
0: jdbc:phoenix:localhost> select period/10 as tm, hostname, usage from
test1 ;
+----------------------------------------+------------------------------------------+------------------------------------------+
| TM | HOSTNAME |
USAGE |
+----------------------------------------+------------------------------------------+------------------------------------------+
| 143985345 | qa9
| 4.27 |
| 143985346 | qa9
| 5.27 |
| 143985346 | qa9
| 8.27 |
+----------------------------------------+------------------------------------------+------------------------------------------+
+----------------------------------------+------------------------------------------+------------------------------------------+
| TM | HOSTNAME |
AVG(USAGE) |
+----------------------------------------+------------------------------------------+------------------------------------------+
| null | qa8
| 4.2699 |
| null | qa9
| 4.2699 |
| null | qa9
| 6.77 |
+----------------------------------------+------------------------------------------+------------------------------------------+
Now we can see the hostname (it is not an empty field as before) but tm is
still null.
Thanks,
--Rafit
