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Posted to dev@hawq.apache.org by Vineet Goel <vv...@apache.org> on 2016/07/13 15:15:27 UTC
Re: A question of HAWQ (update/delete)
Update and Delete is not supported yet, but it's in the future plan. There
is a JIRA on it I believe:
https://issues.apache.org/jira/browse/HAWQ-304
Out of curiosity, what specific scenario are you trying to solve that
requires update/delete ?
-Vineet
On Tue, Jul 12, 2016 at 7:10 PM, jinzhy <ji...@neusoft.com> wrote:
> hello everybody，
>
> Can HAWQ or Pivotal HD support 'delete' or 'update' operation in
> HDFS now？I can only create append only table in my computer。
>
>
>
>
>
>
>
>
>
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>
Re: A question of HAWQ (update/delete)
Posted by James Campbell <ja...@pivotal.io>.
One way an “delete” can be implemented in Hawq is to use partition-exchange. It is ugly, but it provides away of implement more of a batch update/delete.
In order to do this, you need partitioned tables. For a delete, you select everything in the target partition out less the row(s) that you don’t want into a new partitioned table. The new table has the correct data in it. You use the alter table command to execute a partition exchange.
You can us this general approach to perform an update.
Generally, it is not a good design practice to use deletes with big data or in data warehouses. We don’t want to be trying to implement an OLTP system. However, if there is a business case to do this, it can be done in more of a batch fashion.
—
Jim Campbell
jacampbell@pivotal.io <ma...@pivotal.io>
O: 703-753-5970
M: 571-247-6511
On July 13, 2016 at 12:18:19 PM, Wales Wang (wormwang@yahoo.com.invalid) wrote:
Actian vectorH can support update , delete on HDFS
Wales Wang
在 2016-7-13，下午11:15，Vineet Goel <vv...@apache.org> 写道：
> Update and Delete is not supported yet, but it's in the future plan. There
> is a JIRA on it I believe:
>
> https://issues.apache.org/jira/browse/HAWQ-304
>
> Out of curiosity, what specific scenario are you trying to solve that
> requires update/delete ?
>
>
> -Vineet
>
>
>
> On Tue, Jul 12, 2016 at 7:10 PM, jinzhy <ji...@neusoft.com> wrote:
>
>> hello everybody，
>>
>> Can HAWQ or Pivotal HD support 'delete' or 'update' operation in
>> HDFS now？I can only create append only table in my computer。
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> ---------------------------------------------------------------------------------------------------
>> Confidentiality Notice: The information contained in this e-mail and any
>> accompanying attachment(s)
>> is intended only for the use of the intended recipient and may be
>> confidential and/or privileged of
>> Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader
>> of this communication is
>> not the intended recipient, unauthorized use, forwarding, printing,
>> storing, disclosure or copying
>> is strictly prohibited, and may be unlawful.If you have received this
>> communication in error,please
>> immediately notify the sender by return e-mail, and delete the original
>> message and all copies from
>> your system. Thank you.
>>
>> ---------------------------------------------------------------------------------------------------
>>
Re: A question of HAWQ (update/delete)
Posted by Wales Wang <wo...@yahoo.com.INVALID>.
Actian vectorH can support update , delete on HDFS
Wales Wang
在 2016-7-13，下午11:15，Vineet Goel <vv...@apache.org> 写道：
> Update and Delete is not supported yet, but it's in the future plan. There
> is a JIRA on it I believe:
>
> https://issues.apache.org/jira/browse/HAWQ-304
>
> Out of curiosity, what specific scenario are you trying to solve that
> requires update/delete ?
>
>
> -Vineet
>
>
>
> On Tue, Jul 12, 2016 at 7:10 PM, jinzhy <ji...@neusoft.com> wrote:
>
>> hello everybody，
>>
>> Can HAWQ or Pivotal HD support 'delete' or 'update' operation in
>> HDFS now？I can only create append only table in my computer。
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> ---------------------------------------------------------------------------------------------------
>> Confidentiality Notice: The information contained in this e-mail and any
>> accompanying attachment(s)
>> is intended only for the use of the intended recipient and may be
>> confidential and/or privileged of
>> Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader
>> of this communication is
>> not the intended recipient, unauthorized use, forwarding, printing,
>> storing, disclosure or copying
>> is strictly prohibited, and may be unlawful.If you have received this
>> communication in error,please
>> immediately notify the sender by return e-mail, and delete the original
>> message and all copies from
>> your system. Thank you.
>>
>> ---------------------------------------------------------------------------------------------------
>>