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Posted to dev@phoenix.apache.org by "James Taylor (JIRA)" <ji...@apache.org> on 2015/08/24 21:19:48 UTC
[jira] [Comment Edited] (PHOENIX-2205) Group by a divided value
(e.g., time/10) returns NULL.
[ https://issues.apache.org/jira/browse/PHOENIX-2205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14709893#comment-14709893 ]
James Taylor edited comment on PHOENIX-2205 at 8/24/15 7:19 PM:
----------------------------------------------------------------
The following seems to work as a workaround:
{code}
select cast(time/10.0 as integer) as tm, hostname, avg(usage) from test group by hostname, tm;
{code}
You might also consider using a date[1] data type instead of an integer and then using the TRUNC function[2] which work with both numeric and time types.
[1] https://phoenix.apache.org/language/datatypes.html#date_type
[2] https://phoenix.apache.org/language/functions.html#trunc
was (Author: jamestaylor):
Looks like a bug. Please file a JIRA. The following seems to work as a workaround:
{code}
select cast(time/10.0 as integer) as tm, hostname, avg(usage) from test group by hostname, tm;
{code}
You might also consider using a date[1] data type instead of an integer and then using the TRUNC function[2] which work with both numeric and time types.
[1] https://phoenix.apache.org/language/datatypes.html#date_type
[2] https://phoenix.apache.org/language/functions.html#trunc
> Group by a divided value (e.g., time/10) returns NULL.
> ------------------------------------------------------
>
> Key: PHOENIX-2205
> URL: https://issues.apache.org/jira/browse/PHOENIX-2205
> Project: Phoenix
> Issue Type: Bug
> Reporter: Rafit Izhak Ratzin
>
> Running with an environment that 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.
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