Re: [Postgres-xc-developers] [Postgres-xc-core] Fix for test case with.sql

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On Fri, May 17, 2013 at 1:58 PM, Ashutosh Bapat <
ash...@en...> wrote:

>
>
>
> On Fri, May 17, 2013 at 2:23 PM, Abbas Butt <abb...@en...>wrote:
>
>>
>>
>> On Thu, May 16, 2013 at 3:13 PM, Ashutosh Bapat <
>> ash...@en...> wrote:
>>
>>> Hi Abbas,
>>> I am also seeing a lot of changes in the expected output where the rows
>>> output have changed. What are these changes?
>>>
>>
>> These changes are a result of blocking partition column updates
>>
>
> Are those in sync with PG expected output?
>

No, in PG the update does not fail, in XC it fails.

> Why did we change the original expected output in first place?
>

Do you mean that the changes in expected output due to blocking of
partition column updates should only be done in alternate expected output
file?

>
>
>> and changing the distribution of tables to replication.
>>
>>
>
> That's acceptable.
>
>
>>
>>>
>>> On Thu, May 16, 2013 at 2:55 PM, Ashutosh Bapat <
>>> ash...@en...> wrote:
>>>
>>>> Hi Abbas,
>>>> Instead of fixing the first issue in pgxc_build_dml_statement(), is it
>>>> possible to traverse the Query in validate_part_col_updatable() recursively
>>>> to find UPDATE statements and apply partition column check? That would
>>>> cover all the possibilities, I guess. That also saves us much effort in
>>>> case we come to support distribution column updation.
>>>>
>>>> I think, we need a generic solution to solve this command id issue,
>>>> e.g. punching command id always and efficiently. But for now this suffices.
>>>> Please log a bug/feature and put it in 1.2 bucket.
>>>>
>>>>
>>>>
>>>>
>>>> On Wed, May 15, 2013 at 5:31 AM, Abbas Butt <
>>>> abb...@en...> wrote:
>>>>
>>>>> Adding developers mailing list.
>>>>>
>>>>>
>>>>> On Wed, May 15, 2013 at 4:57 AM, Abbas Butt <
>>>>> abb...@en...> wrote:
>>>>>
>>>>>> Hi,
>>>>>> Attached please find a patch to fix test case with.
>>>>>> There were two issues making the test to fail.
>>>>>> 1. Updates to partition column were possible using syntax like
>>>>>>     WITH t AS (UPDATE y SET a=a+1 RETURNING *) SELECT * FROM t
>>>>>>     The patch blocks this syntax.
>>>>>>
>>>>>> 2.  For a WITH query that updates a table in the main query and
>>>>>>      inserts a row in the same table in the WITH query we need to use
>>>>>>      command ID communication to remote nodes in order to
>>>>>>      maintain global data visibility.
>>>>>>      For example
>>>>>>      CREATE TEMP TABLE tab (id int,val text) DISTRIBUTE BY
>>>>>> REPLICATION;
>>>>>>      INSERT INTO tab VALUES (1,'p1');
>>>>>>      WITH wcte AS (INSERT INTO tab VALUES(42,'new') RETURNING id AS
>>>>>> newid)
>>>>>>      UPDATE tab SET id = id + newid FROM wcte;
>>>>>>      The last query gets translated into the following multi-statement
>>>>>>      transaction on the primary datanode
>>>>>>      (a) START TRANSACTION ISOLATION LEVEL read committed READ WRITE
>>>>>>      (b) INSERT INTO tab (id, val) VALUES ($1, $2) RETURNING id --
>>>>>> (42,'new)'
>>>>>>      (c) SELECT id, val, ctid FROM ONLY tab WHERE true
>>>>>>      (d) UPDATE ONLY tab tab SET id = $1 WHERE (tab.ctid = $3) --
>>>>>> (43,(0,1)]
>>>>>>      (e) COMMIT TRANSACTION
>>>>>>      The command id of the select in step (c), should be such that
>>>>>>      it does not see the insert of step (b)
>>>>>>
>>>>>> Comments are welcome.
>>>>>>
>>>>>> Regards
>>>>>>
>>>>>> --
>>>>>> *Abbas*
>>>>>>  Architect
>>>>>>
>>>>>> Ph: 92.334.5100153
>>>>>>  Skype ID: gabbasb
>>>>>> www.enterprisedb.co <http://www.enterprisedb.com/>m<http://www.enterprisedb.com/>
>>>>>> *
>>>>>> Follow us on Twitter*
>>>>>> @EnterpriseDB
>>>>>>
>>>>>> Visit EnterpriseDB for tutorials, webinars, whitepapers<http://www.enterprisedb.com/resources-community>and more<http://www.enterprisedb.com/resources-community>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> --
>>>>> *Abbas*
>>>>>  Architect
>>>>>
>>>>> Ph: 92.334.5100153
>>>>>  Skype ID: gabbasb
>>>>> www.enterprisedb.co <http://www.enterprisedb.com/>m<http://www.enterprisedb.com/>
>>>>> *
>>>>> Follow us on Twitter*
>>>>> @EnterpriseDB
>>>>>
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>>>>>
>>>>>
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>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Best Wishes,
>>>> Ashutosh Bapat
>>>> EntepriseDB Corporation
>>>> The Postgres Database Company
>>>>
>>>
>>>
>>>
>>> --
>>> Best Wishes,
>>> Ashutosh Bapat
>>> EntepriseDB Corporation
>>> The Postgres Database Company
>>>
>>
>>
>>
>> --
>> --
>> *Abbas*
>>  Architect
>>
>> Ph: 92.334.5100153
>>  Skype ID: gabbasb
>> www.enterprisedb.co <http://www.enterprisedb.com/>m<http://www.enterprisedb.com/>
>> *
>> Follow us on Twitter*
>> @EnterpriseDB
>>
>> Visit EnterpriseDB for tutorials, webinars, whitepapers<http://www.enterprisedb.com/resources-community>and more<http://www.enterprisedb.com/resources-community>
>>
>
>
>
> --
> Best Wishes,
> Ashutosh Bapat
> EntepriseDB Corporation
> The Postgres Database Company
>
>
> ------------------------------------------------------------------------------
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> security visibility with the essential security capabilities. Easily and
> efficiently configure, manage, and operate all of your security controls
> from a single console and one unified framework. Download a free trial.
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-- 
-- 
*Abbas*
 Architect

Ph: 92.334.5100153
 Skype ID: gabbasb
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*
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