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From James Taylor <jamestay...@apache.org>
Subject Re: Null array elements with joins
Date Mon, 13 Aug 2018 20:10:55 GMT
I commented on the JIRA you filed here: PHOENIX-4791. Best to keep
discussion there.
Thanks,
James

On Mon, Aug 13, 2018 at 11:08 AM, Gerald Sangudi <gsangudi@23andme.com>
wrote:

> Hello all,
>
> Any suggestions or pointers on the issue below?
>
> Projecting array elements works when not using joins, and does not work
> when we use hash joins. Is there an issue with the ProjectionCompiler for
> joins? I have not been able to isolate the specific cause, and would
> appreciate any pointers or suggestions.
>
> Thanks,
> Gerald
>
> On Tue, Jun 19, 2018 at 10:02 AM, Tulasi Paradarami <
> tulasi.krishna.p@gmail.com> wrote:
>
>> Hi,
>>
>> I'm running few tests against Phoenix array and running into this bug
>> where array elements return null values when a join is involved. Is this a
>> known issue/limitation of arrays?
>>
>> create table array_test_1 (id integer not null primary key, arr
>> tinyint[5]);
>> upsert into array_test_1 values (1001, array[0, 0, 0, 0, 0]);
>> upsert into array_test_1 values (1002, array[0, 0, 0, 0, 1]);
>> upsert into array_test_1 values (1003, array[0, 0, 0, 1, 1]);
>> upsert into array_test_1 values (1004, array[0, 0, 1, 1, 1]);
>> upsert into array_test_1 values (1005, array[1, 1, 1, 1, 1]);
>>
>> create table test_table_1 (id integer not null primary key, val varchar);
>> upsert into test_table_1 values (1001, 'abc');
>> upsert into test_table_1 values (1002, 'def');
>> upsert into test_table_1 values (1003, 'ghi');
>>
>> 0: jdbc:phoenix:localhost> select t1.id, t2.val, t1.arr[1], t1.arr[2],
>> t1.arr[3] from array_test_1 as t1 join test_table_1 as t2 on t1.id =
>> t2.id;
>> +--------+---------+------------------------+---------------
>> ---------+------------------------+
>> | T1.ID  | T2.VAL  | ARRAY_ELEM(T1.ARR, 1)  | ARRAY_ELEM(T1.ARR, 2)  |
>> ARRAY_ELEM(T1.ARR, 3)  |
>> +--------+---------+------------------------+---------------
>> ---------+------------------------+
>> | 1001   | abc     | null                   | null                   |
>> null                   |
>> | 1002   | def     | null                   | null                   |
>> null                   |
>> | 1003   | ghi     | null                   | null                   |
>> null                   |
>> +--------+---------+------------------------+---------------
>> ---------+------------------------+
>> 3 rows selected (0.056 seconds)
>>
>> However, directly selecting array elements from the array returns data
>> correctly.
>> 0: jdbc:phoenix:localhost> select t1.id, t1.arr[1], t1.arr[2], t1.arr[3]
>> from array_test_1 as t1;
>> +-------+---------------------+---------------------+-------
>> --------------+
>> |  ID   | ARRAY_ELEM(ARR, 1)  | ARRAY_ELEM(ARR, 2)  | ARRAY_ELEM(ARR, 3)
>> |
>> +-------+---------------------+---------------------+-------
>> --------------+
>> | 1001  | 0                   | 0                   | 0
>>  |
>> | 1002  | 0                   | 0                   | 0
>>  |
>> | 1003  | 0                   | 0                   | 0
>>  |
>> | 1004  | 0                   | 0                   | 1
>>  |
>> | 1005  | 1                   | 1                   | 1
>>  |
>> +-------+---------------------+---------------------+-------
>> --------------+
>> 5 rows selected (0.044 seconds)
>>
>>
>>
>

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