You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@arrow.apache.org by "caiwanli (via GitHub)" <gi...@apache.org> on 2024/10/31 13:43:21 UTC
[I] How to calculate the hash value of a RecordBatch? [arrow]
caiwanli opened a new issue, #44598:
URL: https://github.com/apache/arrow/issues/44598
### Describe the usage question you have. Please include as many useful details as possible.
My requirement is: Suppose my RecordBatch contains three columns, and I would like to calculate a hash value based on two of those columns. The process is illustrated in the following diagram:
The function interface I designed is as follows:
`vector<size_t> HashRB1(std::shared_ptr<arrow::RecordBatch> &input,
vector<int> idxs,
int type);
`
Where ‘input’ is the input data, ‘idxs’ specifies the columns for which the hash needs to be calculated, and ‘type’ indicates the type of hash function.
or,
It can also be done as shown below, where the hash value is added as a new column to the existing RecordBatch.
Function interface：
`shared_ptr<arrow::RecordBatch> HashRB2(std::shared_ptr<arrow::RecordBatch> &input,
vector<int> idxs,
int type);
`
In summary, how should I implement the HashRB1 or HashRB2 function? I checked the Arrow documentation, and it seems there isn't a direct function to compute a hash for a RecordBatch.
### Component(s)
C++
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: issues-unsubscribe@arrow.apache.org.apache.org
For queries about this service, please contact Infrastructure at:
users@infra.apache.org
Re: [I] How to calculate the hash value of a RecordBatch? [arrow]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #44598:
URL: https://github.com/apache/arrow/issues/44598#issuecomment-3521359372
This issue has been marked as stale because it has had no activity in the past 365 days. Please remove the stale label or comment below, or this issue will be closed in 14 days. If this usage question has evolved into a feature request or docs update, please remove the 'Type: usage' label and add the 'Type: enhancement' label instead.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: github-unsubscribe@arrow.apache.org
For queries about this service, please contact Infrastructure at:
users@infra.apache.org
Re: [I] How to calculate the hash value of a RecordBatch? [arrow]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed issue #44598: How to calculate the hash value of a RecordBatch?
URL: https://github.com/apache/arrow/issues/44598
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: issues-unsubscribe@arrow.apache.org
For queries about this service, please contact Infrastructure at:
users@infra.apache.org