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https://issues.apache.org/jira/browse/DRILL-8169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17507804#comment-17507804
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ASF GitHub Bot commented on DRILL-8169:
---------------------------------------
cgivre opened a new pull request #2496:
URL: https://github.com/apache/drill/pull/2496
# [DRILL-8169](https://issues.apache.org/jira/browse/DRILL-8169): Add UDFs
to HTTP Plugin to Facilitate Joins
## Description
(Please describe the change. If more than one ticket is fixed, include a
reference to those tickets.)
## Documentation
There are some situations where a user might want to join data with an API
result and the pushdowns prevent that from happening. The main situation where
this happens is when
an API has parameters which are part of the URL AND these parameters are
dynamically populated via a join.
In this case, there are two functions `http_get_url` and `http_get` which
you can use to faciliate these joins.
* `http_get('<storage_plugin_name>', <params>)`: This function accepts a
storage plugin as input and an optional list of parameters to include in a URL.
* `http_get_url(<url>, <params>)`: This function works in the same way
except that it does not pull any configuration information from existing
storage plugins.
### Example Queries
Let's say that you have a storage plugin called `github` with an endpoint
called `repos` which points to the url: https://github.com/orgs/{org}/repos.
It is easy enough to
write a query like this:
```sql
SELECT *
FROM github.repos
WHERE org='apache'
```
However, if you had a file with organizations and wanted to join this with
the API, the query would fail. Using the functions listed above you could get
this data as follows:
```sql
SELECT http_get('github.repos', `org`)
FROM dfs.`some_data.csvh`
```
or
```sql
SELECT http_get('https://github.com/orgs/{org}/repos', `org`)
FROM dfs.`some_data.csvh`
```
**WARNING: This functionality will execute an HTTP Request FOR EVERY ROW IN
YOUR DATA. Use with caution.**
## Testing
Added unit tests.
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> Add UDFs to HTTP Plugin to Facilitate Joins
> -------------------------------------------
>
> Key: DRILL-8169
> URL: https://issues.apache.org/jira/browse/DRILL-8169
> Project: Apache Drill
> Issue Type: Improvement
> Components: Storage - Other
> Affects Versions: 1.20.0
> Reporter: Charles Givre
> Assignee: Charles Givre
> Priority: Major
> Fix For: 2.0.0
>
>
> There are some situations where a user might want to join data with an API
> result and the pushdowns prevent that from happening. The main situation
> where this happens is when
> an API has parameters which are part of the URL AND these parameters are
> dynamically populated via a join.
> In this case, there are two functions `http_get_url` and `http_get` which you
> can use to faciliate these joins.
> * `http_get('<storage_plugin_name>', <params>)`: This function accepts a
> storage plugin as input and an optional list of parameters to include in a
> URL.
> * `http_get_url(<url>, <params>)`: This function works in the same way except
> that it does not pull any configuration information from existing storage
> plugins.
> ### Example Queries
> Let's say that you have a storage plugin called `github` with an endpoint
> called `repos` which points to the url: https://github.com/orgs/\{org}/repos.
> It is easy enough to
> write a query like this:
> ```sql
> SELECT *
> FROM github.repos
> WHERE org='apache'
> ```
> However, if you had a file with organizations and wanted to join this with
> the API, the query would fail. Using the functions listed above you could get
> this data as follows:
> ```sql
> SELECT http_get('github.repos', `org`)
> FROM dfs.`some_data.csvh`
> ```
> or
> ```sql
> SELECT http_get('https://github.com/orgs/\{org}/repos', `org`)
> FROM dfs.`some_data.csvh`
> ```
> ** WARNING: This functionality will execute an HTTP Request FOR EVERY ROW IN
> YOUR DATA. Use with caution. **
>
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